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HVAC Combustion Air Opening Size Calculator
HVAC Combustion Air Opening Size Calculator
Total Appliance Input (BTU/hr)
*
Room Length (ft)
*
Room Width (ft)
*
Room Height (ft)
*
Combustion Air Method
*
Select...
Two Openings - Vertical/Direct
Two Openings - Horizontal
Single Opening
Two Openings - Vertical/Direct
Two Openings - Horizontal
Single Opening
Grille Free Area (%)
*
Calculate
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