General Forumulas

Drive belt sizing

Total belt length = [(pitch of driver pulley + pitch of driven pulley) x 1.57] + (2 x center distance of pulleys)

Blower rpm calculated 

RPM = (pitch of driver pulley / pitch of driven pulley) x blower motor rpm

Area of circle = 3.142 x radius squared (pie are squared!!!)

Circumference of a circle = 3.142 x diameter

Area of opening in sq ft = length “ x width “ / 144 

General Info

Nominal CFM = 400 cfm / ton

One ton of refrigeration = 12,000 btu

1 psi  = 27.684” of water

1 gallon of water = 8.3453 pounds

1 horsepower = 746 watts


Degree F = (Temp in C  x 1.8) + 32

Degree C = (Temp in F – 32) / 1.8

The Calculating tool uses both quantitative data and qualitative information covering HVAC design, installation and operation to benchmark energy efficient performance and identify potential areas for improvement.

AC cooling load


AC Heating Load


HVAC Efficenet

Conversion Tool

User warning: all this results are based on quick estimate calculation. Exact heat /cool load can be determined with a full heat and cool load analysis

So, whether you need a small split system, large chiller & cooling tower or boiler plant, AIR TRACK INC
can provide you with a customized solution. Give us a call – (905) 330 4056.

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