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Exhaust Fans
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Industrial, Commercial & Agricultural Exhaust Fans & Accessories |
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A good starting point for selecting your exhaust fan is by calculating your CFM requirements based on complete changes of air in a structure or room in a given time period. Once you have calculated the volume of air in your space (length X width X average ceiling height) measured in cubic feet, you can determine the appropriate CFM (Cubic Feet per Minute) required by dividing the volume of your structure with the Minutes per Air Change number from the chart above. In the most severe conditions select the lower number (in the series shown) to change the air more frequently. For moderate conditions, select the mid-range. For less severe conditions in cool climates, the higher number will provide adequate ventilation.
General Exhaust Fan and Ventilation Recommendations.
1. When possible, install your exhaust fan to discharge in the same direction as the prevailing winds. This keeps your fan from having to fight against cross winds and can actually help the performance of your fan. Weather hoods can also be used to alleviate this problem. 2. Locating intake or supply air to take advantage of prevailing winds will aid in creating positive pressure. 3. Air flow generally flows in the path of least resistance, so locating your exhaust fan at a distance from your supply or intake air, and keeping your target area in between will maximize the scavenging effect and will introduce fresh air into your target area. 4. To ensure proper amount of supply air, the intake area should be at least 20% greater than the exhaust fan propeller discharge area. 5. When using filters on intake or fresh air supply areas the static pressure loss from the filters should be taken into account. You make need to increase the area of the intake to minimize pressure loss due to the supply filter resistance. 6. If there are more powerful existing fans already installed, you may need to consider the effects of them fighting or bucking the proposed new installation. 7. If it can be avoided, do not install wall exhaust fans directly opposite each other. If possible, separate exhaust fans at least six fan diameters.
8. When flammable or combustible gases exist an explosion proof exhaust fan may be required. An intrinsically safe fan will limit the energy, both electrical and thermal, available for ignition and will typically consist of an explosion proof motor and a non-sparking fan propeller or blower wheel.
9. During winter months, you may need to consider tempering supply air with electric or hot water coils before outside air enters your building.
10. Collect heat, fumes, smells etc. as near to the problem source as possible with your exhaust fan. This helps minimize the possibility of spreading to other areas.
11. When ducting is required, make all duct runs as short and direct as possible minimizing static pressure loss and keep duct velocity as low as practical by considering type of fumes being extracted and the length of duct run.
12. Keep intake and exhaust ducts 20% over fan wheel area when possible to minimize static pressure loss.
13. Select point and height of exhaust fan discharge areas to eliminate re-circulation into other plant areas and to minimize complaints from adjoining properties.
14. Noise levels and mounting heights should be considered to maximize employee comfort and to ensure OSHA compliance.
15. When operating exhaust fans in abrasive, corrosive or high temperature environments, special coatings such as epoxy or heresite coatings may be required to achieve maximum protection and operating life.
Wall mount exhaust fans
are one of the most popular methods used to remove unwanted heat, fumes
and humidity from an area. Wall exhaust fans, when used in conjunction with
intake louvers, can also be used to draw fresh air in to a building and
create air circulation. Wall exhaust fans create a safer and more productive
workplace environment by removing hot stale air and bringing cool fresh
air into the area.
Some factors to consider when selecting a wall mounted exhaust fan are power sources available such as single phase or three phase power, how clean is the air stream, whether or not gravity shutters or actuator driven shutters are required for your wall exhaust fan, how sensitive is the area to sound and whether a belt driven or direct driven wall exhaust fan is preferred.
We offer wall exhaust fan accessories such as weather hoods, single stage and two stage thermostats, modulating thermostats, rheostats or variable speed controllers and variable frequency drives. Various motor options for all wall mount exhaust fans are also available such as, totally enclosed air over or totally enclosed fan cooled motors, explosion proof motors, two speed motors and 50Hz motors for applications out of the United States.
The type and size of an exhaust fan required is determined by looking at
several factors unique to your application. The most important are the
volume of the space, how the space is being used and environmental
factors such as humidity and fume levels.
Roof mount exhaust fans permit location of the fan near the area to be ventilated allowing short duct runs and more efficient operation. Roof mounted exhaust fans are perfect for removing unwanted heat or lighter than air fumes that rise to the ceiling. Roof exhaust fans are also perfect for exhausting fumes or smoke from equipment without causing cross winds.
Shutter mount exhaust fans are
mounted on a frame with gravity dampers or sometimes motor controlled dampers designed to close when the fan
shuts off. This keeps the outside air from entering back into the building when the fan is not in operation. Shutter mount wall exhaust fans are typically shipped fully assembled so you are up and running with minimal installation time. Sometimes the damper can be removed or sold separately. This is helpful for thicker walls and prevents any gaps when the shutter mounted wall exhaust fan isn't deep enough to pass through the full thickness of the wall. Our shutter mounted wall exhaust fans can supplied with a variety of motor options from odp (open drip proof) motors for relatively clean air streams to totally enclosed motors for dirty locations to explosion proof wall exhaust fans where combustible or explosive fumes are present.
Fresh air supply fans are essentially an exhaust fan rotated 180º in the wall and typically mounted in a cabinet with a powered damper. The supply fan is used to draw fresh air into a space and can be used as an aggressive substitute to intake dampers and louvres. Fresh air supply fans also known as make up air fans can be used when exhaust fans are present and fresh air is needed to equalize the pressure in the room. Fresh air supply fans or make up air fans are often used in commercial kitchens to keep the hood exhaust from pulling excessive amounts of heated or air conditioned from the restaurant. Fresh air supply fans and make up air fans are sometimes but not always filtered to keep contaminated air from entering your building. When using a roof supply fan make sure the inlet is a minimum of ten (10'-0') feet from the discharge of your exhaust fan. This prevents the roof supply fan from grabbing any of the contaminated or exhausted air from your exhaust fan.
Guard mount exhaust fans and panel mount exhaust fans are often used to remove air from one room and discharging it in
another such as an attic. This style of fan offers no protection from
outside elements since there are no gravity dampers. Panel mount wall exhaust fans are often mounted on the interior surface of a wall and used in conjunctions with a gravity wall shutter or a motorized wall shutter. Typically either a shutter or guard is required when using a guard mount wall exhaust fan or a panel mount exhaust fan because there is no protection for the moving blades and to prevent someone from getting hurt by the blades. OSHA requires exhaust fan blades to be guarded for installations below seven (7'-0") feet. |
