Exhaust Fans & Inline Fans for Residential Ventilation

Most of today’s new homes are highly insulated and practically air tight. While this is great as far as cost effective energy bills go, the down side to tightly insulated homes is poor indoor air quality. As windows and doors are typically kept shut throughout the day, moisture, and stale air that can carry contaminants and pathogens circulates inside homes and gives rise to various problems including mold and mildew, health problems, ruined furniture, peeling paint etc. This is why it is important that you take every step to improve the quality of your indoor air, which can be achieved through mechanical ventilation.

An excellent way to ventilate your home thoroughly, efficiently, and cheaply is to install exhaust fans in your home. This article explains what exhaust fans are, their different types, how to select the best one for your home, and also the benefits of exhaust ventilation fans.

What Are Exhaust Fans

An exhaust fan is a mechanical ventilation device that helps to draw out stale and impure air from your home and bring in fresh air, thereby improving the quality of indoor air. Exhaust fans are typically ducted to the exteriors of your house, through which bad indoor air can effectively be removed from your living space.

Types Of Exhaust Fans

Exhaust fans are classified into various types, mainly depending on the type of mount and the location where you need to install the fans. The different types are:

1. Ceiling Mounted Exhaust Fans: As the name suggests, ceiling exhaust fans are those which are installed in the ceiling. Such fans expel stale air from your home upwards through the roof. The fan is connected to ducting, which is exhausted outside the home via an external vent, like a roof cap or soffit exhaust vent.

2. Inline Exhaust Fans: Unlike ceiling exhaust fans that are installed directly into the ceiling, inline exhaust fans are typically mounted in-between ducting, hence the name inline fan. For instance, if you wanted to ventilate an area that did not have clearance or space for a ceiling mount fan, you would make use of inline exhaust fans to ventilate such areas. The exhaust fan would be placed in between the ductwork and the stale air would travel through the ducts and ultimately be expelled from your home. Since inline fans are not mounted directly to the ceiling, they are very quiet. When installing an inline fan, to reduce noise, we recommend using an insulated flex duct that is at least eight feet long from the intake port on the ceiling to the inline fan.

Inline exhaust fans are ideal for exhausting areas or rooms where you cannot, or do not wish to install the exhaust fan directly. Since these types of exhaust fans are mounted in remote areas, they are also referred to as remote mounted exhaust fans. Inline exhaust fans can either be single-port (exhausting from a single area) or multi-port (exhausting from multiple areas).

3. Wall Mounted Exhaust Fans: These exhaust fans are installed on walls. Since they are installed on exterior walls of the home and not on interior walls, the stale air has a direct route to the outside of your home and thus no duct work is required in installing these exhaust fans.

4. Combination Exhaust Fans: Exhaust fans are also available as combination units. You have the choice of a fan-light combination where the exhaust fan provides illumination as well, or heat-fan-light combination wherein you get a heater, light and ventilating fan all in a single device.

5. Exterior Remote Mounted Exhaust Fans: While most other exhaust fans are installed inside your home and push stale air out, exterior remote mounted fans are installed outside your home and pull out stale indoor air instead of pushing it out. The main benefit of these exhaust fans is that regardless of however noisy they are, most of the noise remains outside your home.

6. Kitchen Range Exhaust Fans: These fans are mounted inside the range hood over your kitchen stove. Such fans not only help to rid your kitchen of stale air but also help to expel bad odors and reduce moisture levels in your cooking area.

These several types of exhaust fans can be used for complete ventilation of your home including intermittent local ventilation for baths, kitchens, dryer rooms; continuous whole house ventilation throughout your home, and for exhausting hard-to-air spaces such as crawl spaces, attics, and basements.

Benefits Of Exhaust Fans

Exhaust fans are very effective at ventilating your home and other living spaces. Without proper ventilation, the air inside your home can get filled with harmful contaminants and disease causing pathogens.

Pollutants such as pesticides, harmful gases, smoke, pet dander, lead, asbestos, dust mites, paint fumes, grease etc get released into indoor air due to daily activities such as cooking, smoking, burning fuel, bathing, renovating etc. In addition to these pollutants, activities such as bathing, cooking, and washing also release excess moisture in the air and make indoor air extremely humid. If not ventilated adequately, these added pollutants and increased moisture levels can decrease the quality of indoor air greatly, thereby leading to various problems such as:

Health problems including asthma, allergies, nose bleeds, skin rashes, headaches, nausea, and other breathing disorders. In fact, according to the Environmental Protection Agency, a large percentage of the over 20 million annual asthma cases in the US alone can be attributed to bad indoor air quality.

Split, warped and rotted furniture due to excess humidity.

Cracked and peeling paint on the walls.

Formation of fungus, mold spores, and mildew, which in turn lead to severe health problems.

Thus, by using exhaust fans to ventilate your home efficiently and completely, thereby improving indoor air quality, you can rid yourself and your home of all these problems.

Recommended Sizing Of Exhaust Fans

To ventilate your home effectively, it is important that the exhaust fan you choose has the capacity to exhaust the intended space completely. To ensure this, you must select the right sized fan for your needs. Here’s a look at how to size exhaust fans properly.

1. Location of the Exhaust Fan and Air Changes Per Hour:

Where you intend to install the exhaust fan will have a direct bearing on its size. As per the Home Ventilating Institute (HVI), different locations in your home require varying Air Changes Per Hour (ACH) in order to be ventilated properly. Here are the ACH requirements recommended by HVI.

8 ACH for bathrooms

15 ACH for kitchens

6 ACH for rooms other than bath and kitchen

ACH refers to the number of times the air should be completely changed in an hour. Thus, an 8 ACH recommendation for bathrooms means the exhaust fan should have the capacity to completely change the air in the bathroom 8 times in one hour.

All exhaust fans are rated in CFM, which refers to Cubic Feet per Minute. To determine how large an exhaust fan you need (in other words, CFM rating of the fan) here’s what you need to do.

Sizing Bathroom Exhaust Fans:

First and foremost, measure the dimensions (length, width, and height) of the room and then calculate the volume of air in the room by multiplying all these 3 numbers. For instance, if your bathroom has dimensions of 6 x 10 x 8, then the air volume in the bathroom is 480 cubic feet. Thus, the exhaust fan needs to ventilate 480 cubic feet of air in order to achieve 1 ACH. But since the recommended ACH for bathrooms is 8, the fan will effectively need to ventilate 480 x 8 cubic feet, which equals 3840 cubic feet in one hour. Fan ratings are per minute, thus by dividing 3840 by 60, you can achieve the desired CFM rating for the fan which in this case is 64.

A simpler way of determining the CFM rating for bathroom exhaust fans is to simply multiply the length of the bathroom by its width. For every 1 sq. ft. of floor area, you need 1 CFM. Thus, in the above example, area would be 6 x 10 = 60, thus recommended fan size would be 60 CFM.

However, if your bathroom is more than 100 sq. ft. in size, you have to add the different fixtures in your bathroom to reach the desired CFM rating. The recommended CFM for different fixtures is:

· Shower – 50 CFM

· Toilet – 50 CFM

· Bathtub – 50 CFM

· Whirlpool tub – 100 CFM

Thus, if your bathroom is more than 100 sq. ft. in size and has a toilet and shower, you will need an exhaust fan with 100 CFM rating. If a bathtub is also present the CFM rating will increase to 150 and so on.

Sizing Kitchen Exhaust Fans:

When sizing an exhaust fan for the kitchen, you have to take into account the location of your kitchen cooking range (if without range hood) or the size and location of the range hood if there is one. Here are the recommended CFM ratings for kitchen range hood exhaust fans:

Generally speaking, for every 10,000 BTU of the range, it is recommended a minimum of 100 CFM. So if your range is rated at 50,000 btu’s, you would consider getting a fan with at least 500 CFM.

2. Understanding Static Pressure and Measuring Equivalent Duct Length:

When sizing an exhaust fan that does not open directly to the outside but is ducted, it is important to ensure that the exhaust fan has the capability to move stale air throughout the duct and ultimately to the outside. Here, we first need to understand what static pressure and equivalent duct length is.

Static Pressure: Inside every duct, there is a constant pressure being exerted at any point from all directions. When an exhaust fan moves air through the duct, the air counters resistance from this pressure which is known as static pressure. Thus, an exhaust fan has to have the ability to overcome the static pressure in a duct so as to effectively duct stale air to the outside of your home. This can be done by calculating the equivalent duct length of any duct.

Calculating Equivalent Duct Length (EDL): Simply measuring the length of a duct is not enough to know how much static pressure an exhaust fan has to overcome. Ducts may have one or more elbows, turns, or wall caps which add to the static pressure in a duct. Thus, you have to calculate the equivalent duct run and not the actual duct run so as to size an exhaust fan properly.

The static pressure in any duct run differs according to the material of the duct, number of elbows and turns, exterior wall cap and wall jacks etc. Listed below are the standard values for different duct components.

Smooth metal duct: Actual duct length x 1

Flex aluminum duct: Actual duct length x 1.25 (for 4″diameter duct)

Actual duct length x 1.50 (for 6″diameter duct)

Insulated flex duct: Actual duct length x 1.50 (for 4″diameter duct)

Actual duct length x 2.00 (for 6″diameter duct)

Wall caps and roof caps: 30 feet for each cap (for 4″diameter duct)

40 feet for each cap (for 6″diameter duct)

Elbows and turns: 15 feet for each (for 4″diameter duct)

20 feet for each (for 6″diameter duct)

Using the above values, you can calculate the equivalent straight duct length that an exhaust fan has to overcome so as to push stale air outside your home and counter static pressure effectively.

For more information about proper building ventilation please visit the Fan and Blower company web site http://www.fanblower.com/centrifugal_fans.htm

Susann Terlitski
Designer of Industrial Air Handling Units
Fan and Blower Co.
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Industrial Fans for Cooling

Industrial cooling fans are useful for a number of businesses and industries. If you or your any family member operates a parking center, then you need these types of fans to keep the unit well ventilated. An industrial cooling fan has been considered as an efficient means of air circulation to thwart people being overcome by fumes from exhausts, etc. People involve in transporting livestock from one location to another must require these fans as heat can cause damage to your animals. It is your duty to keep your animals relaxed as they are completely dependent on you for their well-being.

People involve in operating a warehouse or a loading dock face a number of problems to keep the temperature in control. They must need to introduce a comfortable working environment so that their employees can work and live in with comfort and peace. Sometimes, normal air conditioning or heating systems can be proved as an expensive option so that people are advised to look for industrial cooling fans. Apart from circulating the air and moving the hot or cold air around the building, the expenditure of running fans combined with a heating and air conditioning system seems to be cheaper than a standalone HVAC system.

If you are an employer and working in a number of industries, then your first duty is to take care of your employees by providing comfortable working surroundings. It doesn’t signify you have to provide a lot of fancy couches and comfy seating, but it does exhibit that you cannot expect a person to work in overheated conditions. In fact, an employer needs to provide decent air quality and conditions for his/her employees to work in. These are the reasons for which the demand of industrial cooling fans has been increased to the great extent.

To purchase an industrial cooling fan, customers need to consult online stores. A simple search through the internet brings them a number of online stores selling the products and services at affordable rates. In addition to their products, their services are unique and exclusive in the market. So, it is advised to make search and see results.

The Various Applications Where Ventilation Fans Are Used:

•The Ventilation Fans are extensively used in various activities such as, fabricating, manufacturing, mining, etc. These Ventilation Fans are used for the removal of dust, fume, and smoke particles from the atmosphere and to make it free from suffocation. Some of the manufacturing units where the Ventilation Fans are used for the mass extraction of fumes and dust particles are, Textile Mills, Steel Mills, Wood product Mills, Ceramics and Aerospace material units. These units install huge turbines and impellers to move the extremely large volume of air.

•Crude Oil and Petrochemical Refineries have to deal with fuels and solvents which are extremely toxic, flammable, and unpredictable. Here, Ventilation Fans are required for the functioning of sophisticated Air Entrainment systems.

•The Mining and Quarrying industries are always immensely reliant on the Ventilation Fans. The Coal dust in these mines can be very explosive if it somehow catches fire. This risk is reduced by the dust removal, which is done by the Ventilation Fans. Very powerful blowers and bulky turbines are implemented to ventilate the mines and quarries.

•The workers in Biological, Chemical, and Pharmaceutical industries have to struggle with biological, chemical, and various other physical risks. In such environment, Ventilations Fans come to their rescue.

Industrial Fans

Industrial Fans will always act like the tough weapons to fight against the toxic and hazardous work area of every small and large industry. The various forms of Ventilation are performed by Air Fume collection system, Robotic welding hoods, Dust collection units, Air Filters, Chemical Scrubbers, Fume containment systems, etc. Ventilation Fans Manufacturers and Suppliers nowadays offer very efficient models for individual needs of industries. Any industrial buyer just has to go online and contact the Industrial Ventilation System Manufacturer in India who can meet the needs exactly and get installation assistance as well.

Additional information can be found 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.
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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.
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Inline Centrifugal Exhaust Fans & Blowers

Industrial Blowers and Fans — About Air Handing Fans

Since July 1, 2003, equipment manufactured for operation in potentially explosive environments has been required to comply with the European Directive 94/9/EC. This directive, commonly referred to as the ATEX Directive, applies to all countries in the European Union (EU) and the European Economic Area (EEA). The ATEX Directive is a collection of EU directives outlining equipment installed and operated in potentially explosive atmospheres. The ATEX directive coordinates various technical and legal conditions throughout Europe to ensure a high level of safety for the end-user by reducing the explosion risk through established design methods. The European Committee for Standardization (CEN) published EN 14986 as a standard specifically for the manufacture of fans for use in hazardous areas. This standard is a guide specifically for fan manufacturers to comply with the ATEX Directive.

Industrial Blowers & Fans – Air Handling Units

Air Handling Units (AHU) combine a fan (or several fans) with other components such as heating and/or cooling elements, filters, and dampers as a means to collectively condition the air in a building. AHU is a general term comprised of many specific types of air handlers including: Make-Up Air Units (MAU), Packaged Units (PU), Rooftop Units (RTU), and Energy Recovery Units (ERU). Air handlers range from very small, low CFM light-duty construction to very large, high CFM heavy-duty construction, and are used in many types of buildings that require air conditioning such as office buildings, hospitals, universities, schools, manufacturing facilities, and data centers. Typically, air passing through an AHU is clean and varies in temperature depending on the specific application. Energy consumption and noise are often important considerations when selecting a fan for an AHU. Plenum fans and DWDI fans are commonly found in these units, but are not used exclusively. To accommodate the various applications these units are used for, Canada Blower offers the most diverse and efficient fans in the industry to meet the need of any air handling unit.

Inline Exhaust Fans Centrifugal Blower Fans

Building elevator shafts require proper air moving equipment to provide smoke control in the event of a fire. Pressurization is used to prevent smoke from migrating through elevator shafts to other floors, similar to how fans are used to control smoke in stairwells. Today’s elevator pressurization systems are designed to allow elevators to be used by firefighting teams. However, some systems are designed for the evacuation of handicapped individuals. While small amounts of smoke in an elevator may be tolerated by firefighters, smoke in an elevator and its entry and exit paths is unacceptable. Canada Blower’s complete offering of smoke and heat exhaust fans are relied upon for elevator shaft exhaust/pressurization in emergency situations.

Buffalo Fans Blowers

Electrical bus systems are used for conveying large volumes of energy within power generation facilities. The efficiency of an electrical bus is a function of temperature. The cooler you are able to keep the bus the more efficient it will operate. Power plants utilize large electrical buses and Buffalo Blower provides fans for cooling these systems. Typically this involves clean air which is circulated through a closed loop system.

Industrial Buffalo Blower Fans Supplier

Air supply and filter houses provide the clean supply air for large scale paint booth applications. The supply air is conditioned and filtered to the precise temp and humidity for the given paint system. This supply air is sent to the main paint booths, curing ovens, electro polishing rooms and pre-treatment areas. Buffalo Blower offers a variety of efficient airfoil fans to meet the stringent requirements of any customer.

Industrial Blower Manufacturer & Suppliers

Emergency smoke exhaust systems are designed to remove smoke and heat from buildings in the event of a fire. These systems play a crucial role in increasing occupant safety and allowing rescue personnel to safely enter burning buildings. Canada Blower offers a full line of smoke and heat fans capable of withstanding a minimum temperature of 500°F for four hours or 1,000°F for 15 minutes. Our inline smoke and heat fans are also available in a vertical roof mount configuration featuring a discharge cap with butterfly dampers and an optional fusible link designed to stay open in the event of a fire.

Industrial Fans

Energy recovery systems have become a popular way to heat and cool homes as well as commercial buildings. Energy recovery applications typically use two fans that provide air through a heat exchanger that “treats” the air by heating or cooling it before it enters the building. Canada Blower’s plenum and forward curved fans are typically used for energy recovery applications and offer a wide range of performance and flexibility.

Inline Exhaust Centrifugal Fans

Generator rooms require a wide range of fans to optimize the performance of generators and other equipment. Exhaust fans are used to prevent heat buildup within the generator room, while supply fans are used to provide fresh air for combustion and efficient generator performance. Room size, space limitations, and mounting capabilities will determine the exact type of fan needed for each specific application. As a leading manufacturer of air moving equipment, Canada Blower offers numerous fan types for meeting any generator room specification.

For additional information please refer to http://canadablower.com

Susan Terlitski
Building Ventilation Engineer
Canada Blower Co.
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Industrial Blowers, Propeller Fans & Blower Fans

Industrial Blowers and Fans for Cooling

Industrial Blowers and Radial Blower Fans for Ventilation

Industrial Blowers & Fans Types

Versatility of Industrial Blowers and Fans

Industrial Fans & Blowers Efficiency

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

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Centrifugal Industrial Blowers – NISCO Blowers and Fans

Centrifugal fans employ the use of a rotating impeller to increase the speed of air stream. The centrifugal speed increases as the air stream reaches the ends of the fan blades and is then converted to pressure. These fans are able to produce high pressures, making them suitable for harsh operating conditions, such as:

* Systems with high temperatures
* Moist or dirty air streams
* Material handling/conveying

Northern Fan Co. has considerable experience with air moving applications. Fans are the “heart” of all ventilation systems, and essential for all industrial processes that require air flow. Northern Fan Co. application experience with nyb fans and blowers is pivotal to the success of a complete air handling package and includes:

– Cast aluminum pressure blowers, axial and vaneaxial fans, industrial exhausters, roof ventilators, centrifugal fans and marine duty fans for a host of air moving requirements;

Continue reading Centrifugal Industrial Blowers – NISCO Blowers and Fans