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Enter CFM exhausted to the outside or use 5000 CFM as a convenient value
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Enter hours worked per week - T:
T =

Enter available Btu per unit - q - from table:
q =

Enter cost of fuel $/unit - C - from table:
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Select desired air temp and enter annual heating degree-day normal - dg - from table below:
dg =

Cost of Heating Loss per year - $ - :
$