Industrial Screw Blowers

Industrial standard ISO-1217 requires the performance of the blower to be measured at the blower outlet. This is a far more accurate indication of the performance of the blower and clearly qualifies the air volume that is available to the aeration system. That is the reason why, for instance, our company provides data for its low pressure screw blowers’ in line with the ISO1217 standard, which requires the performance of the blower to be stated as FAD (Free Air Delivery) – the actual volume of air at the
blower outlet.

From an operational standpoint, it may not always be appreciated that when comparing the energy efficiency of different blower technologies the performance data may not be presented in a comparable manner. For example, lobe blower performance data is commonly offered by indicating the air intake flow volume and the energy used at lobe element shaft, not the actual volume of air the blower package delivers – the net usable air – and not the energy consumption including all the blower package power losses.

This anomaly is all the more surprising when it applies to waste water aeration process operations. In order to maintain the desired oxygen level within the aeration lanes, the precise volume of the aeration air being supplied by the blowers is a critical factor in sustaining the aerobic process. It is for this reason that the latest revision to the Water Industry Mechanical and Electrical Specifications (WIMES) for low pressure blowers has included measuring the blower performance according to the ISO 1217 standard, reflecting the evolving needs of the water industry.

From a technical perspective, the lobe blower has to work harder and therefore less efficiently because the delivered air is compressed externally and depends on back pressure from the connected pipeline (and from water resistance in the aeration tank) to maintain the required air flow and pressure. By contrast, the rotary screw type blower demands less energy because the internal compression concept offers higher efficiency. This becomes even more significant when there is a variable aeration demand; the screw blower exhibits a more consistent volumetric efficiency derived from the design of the rotor elements.

When comparing blower technologies a true package power evaluation should be made. The factors to be considered should include the pressure drops within the blower, transmission losses: belt drive compared to direct drive, motor efficiency and, of course, the air volume at the blower outlet versus the total package power input.

On face value, the lobe blower may appear to offer plant operators a simple, low cost, basic option for low pressure air applications. The reality is that in a low carbon economy many industrial applications can benefit from improved performance and significant energy savings through the replacement of conventional lobe equipment with innovative and sustainable, screw technology solutions.

The increased emphasis on the ISO 1217 standard in providing flow figures from a blower will ensure that operators are provided with a truer picture of blower efficiency and the FAD volume of air that is supplied to their processes.

Additional information can be found at the Fan and Blower company web site http://www.fanblower.com

Susann Terlitski
Air Handling Units (AHU) Engineer
Fan and Blower Co.
abbblower@abbblower.com
http://www.fanblower.com/product.htm
http://www.fanblower.com/manufacturers_centrifugal_blower.htm

Screw Blowers

abbblower@abbblower.com

abbblower

fan,blower,ventilator,high,pressure,industrial,stainless,alloy,fiberglass,FRP,PVC,Propylene,Polypropylene,PVDF,corrosion,resistant,corrosive,resistance,heavy,duty,capacity,process,exhaust

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Industrial Blower Fan System for Ventilation

If relatively straightforward breeze conditioning system is possible, the rate of air velocity method outlined above should be the basic method used. However, there may be rooms or areas within the building that will require special treatment. If so, one of the other methods, such as spot cooling or zone cooling, may be combined with the basic method to achieve the over-all objectives.

Exhaust Fans

Air circulators may be effectively used to boost air velocity through large buildings that have a flow pattern difficult to control. Air circulators are also used to redirect air into occupied areas near floor level. Air circulators are also effectively used in locations where adequate exhaust and supply air fans may be lacking. Air circulation alone may provide heat relief and cooling comfort to individuals in the area. Northern Fan’s Type CABL fan is ideally suited to this application. For many installations, fans like this may be positioned 8′ to 10′ above the floor and at approximately 50′ intervals to obtain a continuously circulating column of air across a room or building. To broaden the column of air, fans should be located abreast of each other 15′ to 20′ apart. Fan locations and positions are easily adjusted to the requirements of the area.

Although an accurate, intelligent calculation of the required air volume for a breeze conditioning system has been made, there are practical limitations in most buildings that may seriously affect the final results. By giving these limitations proper consideration in the planning stage, the system can usually be modified to compensate for them. Some of the more common limitations are listed here.

Effects of Partitions on Industrial Blower Fans

It is obvious that interior partitions restrict and interrupt the flow of air through a structure. The effect of these partitions on the system must be analyzed and solutions found. In buildings with very high ceilings. the cross-sectional area factor may become unrealistic in calculating the required air volume. In most instances, inexpensive baffles can be installed across the building width to reduce the effective cross-section to an area 10′ or 12′ above floor level. Machinery, raw materials and finished goods that obstruct air circulation. These obstacles, like interior partitions, must be considered and methods worked out to overcome the problems they create to the proper circulation of air through the structure. Frequently, the location of heat-producing machinery will seriously interfere with the preferred pattern of air circulation. This situation can destroy the effectiveness of the system. An alternative plan to overcome the problem is essential.

Ceiling Heights and Industrial Fans

Another limitation of the very high ceiling or roof is the difficulty of maintaining the air velocity near floor level. The baffle method just described is usually the best way to reconcentrate the air flow along the floor level where it will be effective in providing personnel comfort. In large buildings, baffles may be required at l00-foot intervals to keep air flow near the floor level.

Industrial Fans & Blowers Layout

Operations within the area frequently require wall openings or loading doors that will drastically interfere with the desired airflow pattern. In some cases, individuals may open windows that should remain closed to maintain effective air circulation. A remedy for each of these problems is required. For maximum efficiency and economy, a good layout will avoid the restricted intake opening. The type of exhaust equipment normally utilized is most economical and efficient if static pressure in the system is 1/8″ or less. To obtain this condition, air velocity through intake openings should not exceed 1,000 feet per minute, a lower figure is usually desirable.

Additional information can be found at the Northern Fan web site http://northernindustrialsupplycompany.com/products/ventilators.html

Oleg Cthetchel
Air Process Systems Engineer
airknife@cogeco.ca
Northern Fan Co.
http://northernindustrialsupplycompany.com
http://northernindustrialsupplycompany.com/burlington/request6.html

Practical Ways of Ventilating

airknife@cogeco.ca

industrial ventilation,ventilation system,ventilating system,fan system,blower system,industrial air system,air moving equipment,air moving system

canadablow

***

High Temperature Blowers

Northern Industrial Co. offers new temperature blowers and fans for various industrial applications to 2200 F. This was achived by using extremely high strength stainless steel alloys for the fans impellers, that allow for higher safe speeds at elevated temperatures.

The Northern Industrial high temperature oven fans line now include:

Operating up to 2200 F, centrifugal, axial and plug fan types;
Pre-engineered and custom made fans for all types of applications with variety of impeller types and accessories;
Canada Blower engineers provide a professional advice and recommend a right fan for every application & oven / plenum design;
The fan offering provides competitive replacement fans to Garden City, Lau, IGE, Alloy Fabricating fan models; repairs, re-build & balancing;
Unique high temperature water-cooled motors for operation up to 2300 F.

High Temperature Blowers & Fans

Fans with ambient air cooling systems handling hot airstreams must have sufficient airflow and be kept in operation until airstream temperatures cool below 120 F to prevent damage to the fan unit. The Tubeaxial fan ambient air cooling system is only effective while fan is operating.

There are two major types of high temperature fans – centrifugal and axial:

Centrifugal Wheels:

Multiblade forward curve wheel. This type of wheel is usually specified where there is a necessity for large volumes of flow against low to medium static pressure requirements. The forward curve blade is that it delivers the same volume of air as either the backward or radial blade wheel, at a lower fan speed, which is important due to wheel stresses at elevated temperatures. This fan is the most common type used in all types of heat treatment operations except where a buildup of material on the blades could occur, as wheel unbalance would result.
Radial Blade, paddle wheel type fans. This type of wheel is usually specified where there is a necessity for medium volumes of flow against medium to large static pressures. The paddle wheel is considered a self cleaning type of wheel. It could be used where there are various materials or dust in the air stream. Due to its structurally strong design, it is used in many heat treatment applications at very high temperatures where maximum fan longevity is desired.

Axial Blade Wheels:

The axial blade wheel is usually specified where there is a need for very large volumes of flows against low static pressure. Axial wheel like the multi-blade forward curve type wheel could cause an axial fan to deliver different air volumes at the same static pressure, if the total pressure requirement of the fan system was underestimated. This type of fan is ideally suited where a large volume of flow is required with a minimum of duct work and is used extensively for small and large furnaces, such as aluminum annealing.

Fans handling hot airstreams must have sufficient airflow and be kept in operation until airstream temperatures cool below 120 F to prevent damage to the fan unit. The Tubeaxial fan ambient air cooling system is only effective while fan is operating.

For additional information please refer to http://northernindustrialsupplycompany.com/index.html.

Oleg Cthetchel
Canadian Process Design Engineer
Northern Industrial Co.
http://northernindustrialsupplycompany.com/products/industrialfan_blowers.html
http://northernindustrialsupplycompany.com/manufacturers.html

Engineering of high temperature fans and blowers for operating up to 2,200 F.

fan blower ventilator high temperature pressure thermo IGE alloy engineering industrial gas garden city circulating circulation oven exhaust plug air kit centrifugal axial

fan@cogeco.ca

fan,blower,ventilator,high,temperature,pressure,thermo,IGE,alloy,engineering,industrial,gas,garden,city,circulating,circulation,oven,exhaust,plug,air,kit,centrifugal,axial

http://www.nisco.net/tchetchel.gif

***

Industrial Fans and Blowers

Industrial Fans & Blowers

Industrial electric fans clearly do not use as much electricity as an air conditioner, circulating air and cooling it at a fast rate for a large space. With high-powered, energy-efficient motors, the larger motor of an industrial fan is actually guaranteed to save energy costs.

Industrial Pressure Fan

Air conditioning can often become too large of an expense for industrial areas, but the good news is that an industrial fan can bring some much needed relief in this case. Industrial electric fans can be quite helpful for places where heat stratification, dampness, and stagnant air become frequent problems. Also, for high static pressure an industrial fan is what you need. Also known as an industrial electric blower, these units replace air as well by blowing out the old and stagnant air for a wide area that otherwise would collect this air without replenishing it in entirety.

Large Industrial Fans

Industrial warehouses, especially profit from these large units because the fans can support a higher CFM rating without the vibrations of a smaller fan. Most electric industrial fans have blades of a higher more durable construction, usually consisting of some kind of metal. This allows the blades to move more air at one time without all the force being applied to the fan and making the motor work harder.

Industrial Fan Types

Industrial fans include several types such as duct fans, roof and ceiling ventilators, wall mounted fans, pressure blowers, and freestanding units with different mounting options. For extreme conditions and plants, drum fans can be used to move even larger amounts of air. These types of fans come with wheels attached and can be rolled to the area that circulation is needed the most. Some manufacturers even sell just the fan heads for a more freedom and a reduced assembly and cost on the company.

Industrial Fan Motors

Powerful motors for reducing excessive noise are used in industrial fans. The motor will not be working at its top speed to produce the necessary airflow, therefore it will be quieter. Industrial electric fans are also very versatile; there are floor fans, wall mounted fans, and pedestal fans that all come in industrial grades. If you plan on a very large space, a pivoting fan is a good choice as you can manipulate the direction of the air and direct it to where it is needed most. Some even come with stands to make these larger fans easy to roll from place to place.

Electric Industrial Fans

These motors are designed to change a large amount of electrical energy into useful fan work. Often as electric industrial fans are in operation for an entire day period, opposed to a home fan which is turned on only when people are home, or in a specific room, the industrial fan needs to be energy efficient for this extra use. These motors can handle more heat than a normal motor meaning less heat waste is produced. If you think you need an industrial fan for your business area, chances are that you do! Make the choice today for comfort and health and consider an industrial fan purchase.

Additional information can be found at the Northern Industrial web site http://www.northernindustrialsupplycompany.com/products/heat_exchangers.html

Oleg Cthetchel
Canadian Air Systems Engineer
Northern Industrial Co.
http://northernindustrialsupplycompany.com/products/industrialfan_blowers.html
http://northernindustrialsupplycompany.com/products/ventilators.html

Industrial Fan for Process Ventilation

ventilator fan blower PRV propeller industrial building ventilation ventilating cooling high volume air circulation circulating wall roof exhaust supply circulator recirculator mobile exhauster

fan@cogeco.ca

nisco@primus.ca

http://www.nisco.net/tchetchel.gif

ventilator,fan,blower,PRV,propeller,industrial,building,ventilation,ventilating,cooling,high,volume,air,circulation,circulating,wall,roof,exhaust,supply,circulator,recirculator,mobile,exhauster

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Large Industrial Fans & Extractor Fans

Large Industrial Fans

Today there are a wide range of commercial extractor fans available on the market to cover just about every application imaginable; from large commercial applications, such as restaurant kitchen extractor systems, to quiet airflow systems that are virtually silent in operation.

Axial Fans

While a commercial kitchen extraction system, commonly made in stainless steel can cost several thousand pounds to buy and install, a large vent-axia through wall extractor fan may be fine for a small hot food business such as a shop making toasted bacon sandwiches.

High Pressure Blower

The new quiet airflow extraction systems are proving popular as they have a high airflow, yet can barely be heard running. This helps keep environmental noise down, and this is often important in an office workplace.

Industrial Inline Fans

Commercial in-line fans are available that sit above the ceiling, often some distance from the room they are actually extracting the air from. They are connected to vents in the ceiling by ducting, which then connects to the inline fan, and then expels the air through more ducting to a grill in an outside wall.

This type of fan has to be used in certain “classes” of environment by law, whereby no electrically powered unit can be placed within a certain distance of damp areas, such as shower rooms as an example.

Industrial Blower Fans Buying

When buying a commercial extractor fan, you will have to take more into consideration than when purchasing a domestic extractor fan. The reason for this is that whilst a domestic fan may be cheap to buy and install, and can be replaced at a low cost if it breaks, the same cannot be said of a commercial extraction system.

Large Industrial Blower Fans Supplier

Most large commercial extractor fan installations will cost several thousand to buy, and will need professional installation. So given the investment you may make in one, you need to be buying with a reputable supplier, as you may be installing it in an environment where you may have to stop work if the extractor fan system breaks down, such as in a commercial kitchen.

If this happens, you need to know that someone can come out and fix your extractor fan very fast, as if you have to close your kitchen down, you will be losing money until it is fixed. So you need to do some research about the company you are buying your fan from, and ensure that they can provide a fast call out, and that they carry sufficient spare parts.

Additional information can be found at the Industrial High Pressure Blower Company web site http://www.highpressureblower.net/OEMFans.html

Alex Todorovo
Industrial Mechanical Process Engineer
High Pressure Blower Co.
alex.todorov@canadablower.com
http://www.highpressureblower.net/canadianbloweraxial.html
http://www.highpressureblower.net/MakeUpAirFans.html

Commercial Fan

fan blower ventilator high temperature pressure industrial super transfer air gas positive negative heavy duty capacity process

alex.todorov@canadablower.com

fan,blower,ventilator,high,temperature,pressure,industrial,super,transfer,air,gas,positive,negative,heavy,duty,capacity,process

***

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Industrial Centrifugal Fans and Blowers Manufacturer

Industrial Centrifugal Fans and Blowers

Canada Blower offers a complete line of centrifugal fan equipment, from small Baby Vent Sets capable of moving a few cubic feet per minute (CFM), to large, heavy-duty industrial mechanical draft fans with capacities to 1,000,000 CFM and with static pressures from 0″ Water Gauge (WG) to 150″ WG.

Centrifugal ventilators

Centrifugal ventilator has a number of blades mounted around the hub, which turns on a shaft that passes through the housing.

Supplier of Industrial Fans & Blowers

Canada Blower is a leading supplier of industrial and commercial fans, ventilators, blowers and accessories for various air-moving applications.

Centrifugal Fans & Industrial Blowers

Canada Blower products include standard centrifugal fan and customized blowers designed to meet our customers’ requirements based on Canada Blower manufacturing standard.

Centrifugal Blowers

A centrifugal blower is a fan designed to move air or gases in a confined area. The centrifugal blower has a number of blades mounted around the hub, which turns on a shaft that passes through the housing. The gas enters the side of the fan wheel and by use of centrifugal force(hence the name) accelerates over the fan blades. A centrifugal blower is usually used in factories or large open places that need air flow.

Inline Centrifugal Fans

Over the years Canada Blower supplied centrifugal fans to a wide range of industries and applications including: combustion air supply, material handling, process ventilation, ovens and dryers, iron and steel industry, mine and tunnel ventilation, petro-chemical, power generation, marine and off-shore structures, pulp and paper, HVAC, paint/spray booths, fertilizer and various emission control applications. For the commercial HVAC market, Canada Blower offers general ventilation fans for institutional and retail buildings, schools, restaurants and hospitals. Special materials, construction, explosion-proof and spark-resistant design, variety of coatings and accessories are available to meet practically any application needs.

Canada Blower fan repair, retrofit and service shop provides complete rebuilds, shaft repairs, blade liners, in-field balancing, vibration analyses, performance upgrade, increased fan capacity, all metallurgies, all type of fans repair, and emergency service on all sizes and designs.

Large Industrial Fans

Canada Blower air moving products are best know for “industrial quality” assuring reliable performance, relentless dependability and longevity. A staff of specially trained engineers will design a dependable fan that exactly fits customers’ dimensional and performance requirements.

Canada Blower fans and lowers are sold and serviced by air moving experts that can evaluate your needs and provide best recommendations for your application.

Additional information can be found at the Canada Blower company web site http://canadablower.com/hvac/index.html.

Susan Terlitski
Air handling Systems Designer
Canada Blower
canadablower@canadablower.com
http://canadablower.com/news/index.html
http://canadablower.com/oem/index.html

Centrifugal Fan by Canada Blower

canadablower@canadablower.com

Chicago,blower,fan,ventilator,New York,TCF,Twin City,industrial,centrifugal,radialpressure blower

chicagoblower

fan@cogeco

***

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Industrial Centrifugal Blowers and Fans

Industrial Blowers & Fans Supplier

Industrial Fan Blower Co. specialises in the development of air movement systems to suit your individual needs. Operating since 1979 we have over thirty years’ experience in the design, manufacture, installation, maintenance and commissioning of the centrifugal fan, and similar systems, and are proud to have gained a reputation for providing an efficient service, technical expertise and a quality of craftsmanship that is unmatched in the industry.

Centrifugal Fans & Blowers

Our in-house team has the technology knowledge and practical application experience to comprehensively assess your needs and design bespoke solution for your requirements.
Our detailed centrifugal fan range of direct drive in line fans are designed to withstand high temperatures. They have motors which are located out of the air stream and a high pressure development system within the centrifugal fan systems which allow for optimum performance no matter where you choose to install them. The ideal solution for commercial and industrial premises we’re confident that out centrifugal fan systems are amongst the foremost available products on the market today.

In additional to the traditional centrifugal fan systems that we provide we’re fully equipped to provide a completely bespoke centrifugal fan solution to any premises where space comes at a premium. All you need to do is contact us with your specific requirements and measurements and our ingenious team of designers will manufacture a centrifugal fan that perfects fits any unusual space. We’re perfectly happy to work alongside architects and builders for any refurbishment or new build products should you require any of our air movement or extraction systems and need structural advice.

Industrial Fan Blower Co. fans and blowers aare used in a variety of applications throughout industry, ranging from providing air for combustion, process aeration, fermentation, drying, cooling and conveying; for extracting dust or fumes, and for handling any type of unusual gas.

Industrial Centrifugal Blowers and Fans Applications

As an illustration of the diversity of uses for our products, some applications are:

FOOD INDUSTRY

– fans for boiler plant in distilleries, breweries and food processing plant. Fans to provide air for germination and drying in maltings.
– Turbo pressure blowers to provide air for fermentation in yeast plants and side channel pressure blowers to handle carbon dioxide.
– Process fans for heating, hot air recirculation, drying, cooling and ventilation for flour mills, bakeries, cereal and chocolate production, and many other food processes.
– Turbo blowers for carbon dioxide injection for sparkling water and wine.

PHARMACEUTICAL

– Specialised process fans and pressure blowers.
– Fans for utility services.
– Clean room ventilators.

GLASS PRODUCTION

– Fans for furnaces and for cooling/tempering.
– Turbo pressure blowers for high pressure gas storage.

For more information on our centrifugal fan range of options, or to see our complete range of products, including energy efficient fans, which increase fan efficiency by fifty percent, or our testing service that ensures that your company complies with all health and safety and COSHH regulations then come visit us online at the Industrial Fan Blower company web site http://www.industrialfanblower.net

Oleg Tchechel
Developer of Industrial Air Make-Up Units
Industrial Fan Blower Co.
asap@buffalofan.com
http://www.industrialfanblower.net/cbd_services.htm
http://www.industrialfanblower.net/cbd_feedback.htm

Multistage Blowers

air handling unit airhandler AHU conditioner industrial commercial ventilator fan blower building ventilation ventilating cooling heating circulation circulating roof top supply

asap@buffalofan.com

industrialfanbl

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Centrifugal Blower

Centrifugal Blowers

A centrifugal fan is a blower designed to move air or gases in a confined area. The centrifugal blower has a number of blades mounted around the hub, which turns on a shaft that passes through the housing. The gas enters the side of the fan wheel and by use of centrifugal force (hence the name) accelerates over the fan blades. A centrifugal blower is usually used in factories or large open places that need air flow.

High Temperature Fans & Blowers Applications

Tough applications mean tough fans and blowers by Northern Industrial Co. Northern Industrial is a world wide distributor of industrial process ans OEM fans and blowers, as well as fan / blower components; including high pressure blowers, high temperature fans, spark resistant and explosion proof ventilators, tubeaxial and vaneaxial high pressure ventilators. Canada Blower also does existing fans and blowers repairs, re-build, as well as dynamical wheels balancing. High-efficiency impellers result in low power consumption, operating costs, and quieter operation. All metal hardware is completely sealed from exposure to corrosion by incapsulating into FRP or plastic; the steel support frame and motor base are powder coated with a corrosion-resistant finish. In addition to being highly resistant to chemical corrosion, PP fans are self-extinguishing and will not support combustion.

This could be an underground carpark, a gymnasium or any other open space with static air. There are many different centrifugal blowers on the market today and choosing one will depend on a number of factors.

Centrifugal Blowers & Fans Blades

The centrifugal blower has a number of blades mounted around the hub, which turns on a shaft that passes through the housing.

A Centrifugal fan can come in three different types of fan blades. They can come with forward curved blades, backward curved blades and straight radial blades. The type you need will come down to what the conditions are within the area in which you intend to use the device.

When inquiring about purchasing a centrifugal fan you will more than likely need someone from the company in which your purchasing the fan to come and take a look at the conditions the fan will be placed and also to check what kind of air pressure there is within the area.

Centrifugal Blower Size

The size of the area in which the centrifugal blower is to be used will obviously play a major part in the decision of how large it needs to be and how much air it can actually blow through the area. There are many different sizes that you can get to cover any area but depending on your circumstances you may need more than one to do the job adequately.

The type of air that is in the premises will also play a large role in which type of Centrifugal Blower you need. If the centrifugal fan is to be used in an area where the air conditions are standard then no adjustments will need to be made to the actual fan itself. On the other hand if you are going to operate the fan in other types of air density then adjustments can be made to the static pressure and brake horsepower.

Centrifugal Blower Placement

Another point to be made when you are interested in purchasing a centrifugal blower is where you intend to put it. There are many different styles of centrifugal blowers, they include roof and ceiling ventilators, pressure and volume blowers, duct fans and blowers or freestanding fans and plenum fans.

There is obviously an advantage with freestanding fans as you have the opportunity of moving it to different areas of the building / factory, which is an advantage. If you do have it mounted then it is out of the way and not taking up valuable room. Most Industrial fans come with a safety guard on them now which is made so that no human appendages can accidentally go into the fan. Most centrifugal fans come with an electric motor although they do make ones now which run off an generator also. This is a huge advantage if there is a power failure within the premises.

Most industrial fans make some kind of noise but with a lot of the new models being released now the noise level is minimal. Some can make more noise than others but this depends on the size of the fan and also the conditions which it is working in.

For additional information please refer to http://northernindustrialsupplycompany.com/index.html

Oleg Cthetchel
Ventilation Engineer
Northern Industrial Co.
http://northernindustrialsupplycompany.com/products/index.html
http://northernindustrialsupplycompany.com/products/industrialfan_blowers.html

Centrifugal Blowers by Northern Industrial Blower

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Roof Exhaust Fans and Roof Ventilators

Roof Exhaust Fans & Ventilators

Proper ventilation requires that there be a movement or circulation of the air within the space and that the temperature and humidity be maintained within a range that allows adequate evaporation of perspiration from the skin. It was formerly believed that the discomfort, headache, and lethargy commonly associated with poor ventilation were caused entirely by the increase in the amount of carbon dioxide and the decrease in the oxygen content of the air. There is evidence to show, however, that the deleterious effects result largely from interference with the heat-regulating mechanism of the body. Lack of air currents and the increase in relative humidity and temperature (especially noticeable in crowded, poorly ventilated places) prevent normal evaporation of perspiration and loss of heat from the surface of the skin.

A simple roof ventilator is essentially an opening in the roof with a cover to keep out rain and to prevent winds from interfering with its functioning. Natural convection is an appreciable aid to ventilation in a large building only if it contains sources of large amounts of heat. A further useful adjunct is a fan fan, device for agitating air or gases or moving them from one location to another. Mechanical fans with revolving blades are used for ventilation, in manufacturing, in winnowing grain, to remove dust, cuttings, or other waste, or to provide draft for a fire. The addition of distribution ducts to the fan and a system for forcing air into the building provides greater efficiency. Outlets are designed to attain maximum mixing of air and to move large amounts of air at low velocity so that temperature layers are eliminated. Factories have special suction hoods and enclosures to draw away localized dust, fumes, and heat. Incoming air may be cleaned of dust by filters or electrostatic precipitators.

Roof Exhaust Fan Ventilation

Natural ventilation depends on winds outside and convection currents inside a building. Winds raise air pressure slightly on the windward side of a building and lower it slightly on the lee side. The pressure difference promotes circulation into the building on the windward side and out of it on the lee side. Convection currents are caused by the sinking of colder and therefore heavier air, which displaces the warmer air. A building may have a roof ventilator to allow the rising warm air to escape. If there is an opening to the outside at the bottom of the building, fresh, cool air will be drawn in.

Deep mines, underwater tunnels, and other subterranean and submarine environments require elaborate mechanically operated systems for maintaining the air supply in a healthful condition. The lives of those working in, or traveling through, such areas depend upon a constant supply of fresh air; not only must the systems used be highly efficient, but there should be provision for emergencies in case of failure of the apparatus in operation. An outgrowth of studies of problems of ventilation is the development of methods of air conditioning heat pump is a reversible device that does mechanical work to extract heat from a cooler place and deliver heat to a warmer place. The heat delivered to the warmer place is, approximately, the sum of the original heat and the work done.

Such systems, unlike ordinary methods of ventilation, are independent of outdoor atmospheric conditions and can, therefore, maintain the indoor atmosphere at the most healthful temperature and humidity and can free the air of dust and other undesirable materials. They accomplish this, however, at a considerable cost in energy.

Roof Exhaust Fan Ventilator Uses

Roof ventilators are another option. They work in both summer and winter. In summer, roof ventilators reduce the build up of heat in the ceiling spaces, reducing the heat load on your insulation, meaning that the insulation works more effectively. In turn, you will save on your electricity bills as the air-conditioning systems will not have to work as hard. In winter, it reduces the amount of condensation that forms when warm, moist air from exhaust fans meets cold surfaces. Roof ventilators will also reduce the amount of corrosion and timber that occurs because of condensation. Roof ventilators should be installed where there is sarking underneath tiled roofs, when metal deck roofing is used, and when there is evidence of condensation in the roof spaces or ceilings.

A reliable ventilation system that can operate during a fire is both vital and essential. It prevents smoke logging, allows people to escape quickly, minimizes damages to property and contents and enables firemen to attack the fire without hindrance. Such power roof ventilators have the added advantage of providing normal day to day ventilation and in many cases can also be fitted with duct work for use in multi storey buildings.

Additional information can be found at the Northern Industrial web site http://northernindustrialsupplycompany.com/products/ilg.html.

Oleg Cthetchel
Canadian Industrial Ventilating Engineer

Roof Exhaust Fan Ventilators

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Radial Blowers

Radial Blowers and Radial Fans

Radial Blower fans are used for many purposes these days whether that be for items found in most households or in cars or factories. They play an integral part in our everyday lives and will do so for many years to come.

Northern Industrial Co. is a world wide distributor of industrial process ans OEM fans and blowers, as well as fan components; including high pressure blowers, high temperature fans, spark resistant and explosion proof ventilators, tubeaxial and vaneaxial high pressure ventilators. Canada Blower also does existing fans and blowers repairs, re-build, as well as dynamical wheels balancing.

Radial Blower Applications

A radial Blower fan is used in a large number of different industries, whether that be for the fan in your car or a fan in your computer to keep it from heating up too much. The word Radial Blower means spreading out of a common centre which is how most fans work. They can also be used in large industrial type settings where there is a need to push either cooling air or just making sure there is air flow through a certain area.

Radial Blower fans can also be known as a centrifugal fan, which is made up of three different types of blade settings. They are the straight steel plate paddle wheel, the forward multi-vane multi-blade and the backward turbo vane. They are also used in Industrial type situations such as factories, large underground carparks and gymnasiums. They can be used in lots of different situations where there are large enclosed open spaces which need some type of circulation, whether that be blowing cold air through the premises or to just have some sort of air movement. There are different types of fans, which can be put in an industrial factory such as a mounted fan or a freestanding fan. Obviously to do a large area you need a large fan so having it mounted can be a benefit whilst having it freestanding can also be a benefit because it can be moved if need be. There are also different noise levels of these fans but most fans these days are relatively quiet especially in an area such as a factory.

A radial Blower fan is used in so many different ways and usually run by using electricity although a radial Blower fan can also run off a generator. Most households have a radial Blower fan, there is generally some sort of fan found in most houses. A radial Blower fan can be just your normal portable fan or a ceiling fan is normal is most humid areas. When you do have a ceiling fan it’s important to note that most of them must be put in by an experienced electrician otherwise you could have some serious problems with them. They are certainly a lot more economical than running an air conditioner, which is why they are so popular in humid areas where having some air flow cools down the place. Radial Blower fans are also found in most air conditioning units now, they are used to blow cooled air out of the unit and into the room.

Automobiles also have radial Blower fans placed in them to keep them from overheating, this is probably the most popular use for radial fans in this day and age. They’re placed under the hood of the car to keep the motor cool and stop it from overheating. Another use for radial Blower fans is also the home computer, obviously these are a lot smaller than most radial Blower fans but they get the job done, by stopping the computer from overheating also.

Oleg Cthetchel
Canadian air systems designer
Northern Industrial Co.

Industrial Radial Blower Fan

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