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 Products >
Ventilation / Exhaust Fans > Fan Selection Guide
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Guide to Proper Fan Selection
General Considerations:
- The AIR FLOW PATH is controlled causeing the air to move through the area you
wish to ventilate. This is done by proper placement of the fan and air inlets. If possible,
the fan should not be mounted on the weather side of the building. Also, the fan
and air inlets should be mounted on opposite sides of the area to be ventilated, to draw
fresh air through.
- SUFFICIENT INLET area must be provided. It is recommended that one square foot of
inlet area be provided for each 750 C.F.M. of fan capacity.
- EXPLOSION PROOF FAN styles should be used in combustibles atmospheres.
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Industrial Ventilation:
- Determine CUBIC FEET of AREA to be ventilated. (CF equals L x W x H).
- Determine the NUMBER of MINUTES REQUIRED to produce a complete air exchange.
| Recommended Air Exchange: |
| Meeting Halls |
3 - 10 minutes |
Welding Shop |
1 - 5 minutes |
| Warehouses |
5 - 10 minutes |
Laundry |
1 - 3 minutes |
| Garage |
5 - 10 minutes |
Foundry |
2 - 8 minutes |
| Machine Shop |
5 - 10 minutes |
Compressor Room |
1 - 5 minutes |
| Boiler Room |
1 - 3 minutes |
Painting Room |
1 - 3 minutes |
Note : If comfort cooling is required - use the
lower figure. |
- Calculate CUBIC FEET per MINUTE (CFM) required by dividing the number of minutes for
air change, from step 2, into the cubic feet of area to be ventilated.
Example : A garage is to be ventilated that has 15,000 cubic feet. From the chart, it has
been determined that an air change should take place every 5 minutes.
C.F.M. =
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Cubic Feet =
Air Change Rate |
15,000
5 |
= 3,000 C.F.M.
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- Consideration should be taken for STATIC PRESSURE ( S.P.). Static pressure, simply put,
is a measurement of resistance against air moving through the system. If a shutter is used
with a fan, it will create 0.125" of static pressure. If a shutter were used in the example in
example above, the fan capacity required would be 3,000 C.F.M. at .125 S.P. If duct work or
other restrictions are to be used, their restrictions must be allowed for.
- Review available installation accessories for ease of installation and economical
shipping.
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