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Furnace sizes are determined by the quantity of fuel that they consume in an hour. This limits the choices for installation, and dictates what size furnace to install. If the total heat loss for the house is 44,600 btu, and you wish to use an oil furnace, then a 56,000 btu furnace should be used. Even though your room totals are 44,600, you must distribute all 56,000. To do this, the corresponding cfm of the equipment must be known.

If you know both the btu and cfm of your desired equipment, return to the calculator and enter those output values. Otherwise, the charts below give approximate btu and cfm outputs for oil furnaces, gas furnaces, hydro-air handlers, and cooling air handlers.

Always design the duct system for the greater cfm requirement if doing heating and cooling with the same sytem.

If the heating requirement is 800 cfm, while the cooling requirement is 1000 cfm, then the system must be designed to accommodate 1000 cfm.

     
 
Oil Furnace Gas Furnace
btu cfm btu cfm
56000 800 42000 800
85000 1000 56000 800
112000 1200 70000 1000
125000 1400 85000 1200
150000 1500 98000 1400
    112000 1600
   
 
Hydro-Air (140°F Water Temp) Cooling
btu cfm btu cfm
30000 600 18000 600
35000 800 24000 800
45000 1000 30000 1000
50000 1200 36000 1200
70000 1600 42000 1400
90000 2000 48000 1600
    60000 2000
   
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