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 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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Axial Ventilators

Axial flow fans or industrial axial fans move an air stream along the axis of the fan. The way these fans work is similar to the propeller on an airplane: the fan blades generate an aerodynamic lift that pressurizes the air. Axial Northern Fans use a propeller to draw the air into the fan then discharge it in the same axial direction. Typical types of industrial axial fans include:

* Tube axial fans (also called duct fans),
* Panel fans (also called wall fans),
* Personnel coolers,
* Roof Ventilators,
* Air circulators,
* Vaneaxial fans

As specialists in air moving applications and equipment, Buffalo Fan Co. understands industrial blower technology and designs systems for a host of facilities and industries, and work with the best names in industrial blower equipment, including TCF, NYB, IAP. A blower can achieve much higher pressure than a fan, and can be used to produce negative pressures for industrial vacuum systems. In selecting the right industrial blower equipment to serve your needs, you must consider conditions such as:

– Required airflow through the blower;
– Static pressure through the complete system;
– Suction pressure at the blower inlet;
– Airflow conditions through the blower;
– Altitude at which the blower will be operating;
– Composition of what is going through the blower – for example, is it explosive or flammable ?

Industrial Fans and Blower Fans

Northern Fan and exhaust TCF fans do not differ significantly from non-industrial types in their basic operation. The main characteristics that make blowers and fans industrial are the heavy duty construction, wheel type, shaft and bearings, materials and gauges used. Northern Fan Co. will work through all of the necessary considerations in developing an industrial air movement system that best addresses your needs and provides you with the most advanced industrial blowers and industrial TCF exhaust fans from the leading manufacturers.

Propeller / axial wheel types may include:

– Fixed pitch
– Adjustable pitch
– Swept back design
– Impeller wheel
– Low noise
– Reversible

Bifurcated Fans are direct driven axial fans where the motor is encased in a metal box to isolate it from the airflow. The term “bifurcated” means split in two branches, or parts. In terms of a bifurcated fan, the fan is constructed so that the fan rests between two forked channels, which carry the air, creating a void behind the axis of the fan itself. This makes Northern bifurcated fans ideal for exhausting or re-circulating fumes, gases and hot air up to high temperatures. The bifurcated fan motor must have access to ambient air, and have non-overloading characteristics. TCF bifurcated fans are typically used when the motor needs to be shielded from hot gases or other threatening conditions.

HVLS fans blanket a very large area with constantly moving air to create an expansive comfort zone. As a result, the big ceiling fan (up to 24 feet in diameter) can create an evaporative cooling effect during the summer months while de-stratifying uneven floor to ceiling temperatures in the winter. This results in significant energy savings since the heating system cycles less frequently.

Oleg Cthetchel
Developer of Industrial Equipment

Fan and Industrial Blower

Oleg Tchetchel

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