There is a new forced air furnace equipped with an induced draft fan beside a conventional water
heater in a basement. The customer has decided to enclose the area to make a separate furnace room.
The house is approximately 25 years old and has a door separating the basement from the upper levels.
Furnace input is 100,000Btuh with AWH input of 25,000 Btuh. The enclosure is 10ft x 20ft x 7ft. The
structure dimensions are 20ft x 30ft x 7ft x 3 levels. What size opening will be required in the furnace
room door for combustion air?
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