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Tech Info

General Rule for Cooling CFM Requirements:

 400 CFM Per Ton


Finding an Unknown CFM:

 (BTUH / (TEMP.Rise * 1.08))


Heating Output for Electric Resistance Heater:

(KW * 3413)


A rough but safe rule of thumb to use in the absence of available engineering data is to multiply the gross filter grille area in square inches by 2 CFM for each square inch. This will keep the face velocity below 400 FPM. For instance, if one thinks a 20 x 20 grille might be adequate, 20 x 20 = 400 gross square inches. Multiply this by 2 CFM per square inch and the result is a CFM of 800.


Metric to Standard Table
Centimeters * .3937 = inches
Meters * 3.281 = feet
Meters * 1.0936 = yards
Kilometers * .6214 = miles
Liters * 33.82 = fl. oz.
Liters * .2642 = gals
Grams(water) / 29.57 = fl. oz.
Kilograms * 2.2046 = lbs.
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