Combustion Air Calc
We recently tightened up our basement so we needed to install a Fan in the Can for makeup air- man is that thing loud, right under our living room. I'm wondering if we could have gotten by with a fully louvered door instead. Am I reading these calculations correctly for a 125K steam boiler and 40k HWH gas?
165K of input requires (2x) 165 square inches of free area, within 1' of ceiling and floor. Roughly 13"x13" each without obstructions.
I have a utility door that would provide access to the entire basement, 28" x 78", 2184 square inches. I read this as I need 330 square inches without obstructions, or 15% of the door to net this amount of free area. Is a wooden slat door in that ballpark? Hard to find any info on this.
Comments
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This should have all the information you need.
The Fan in a Can should not be that loud. perhaps the fan shaft or fan wheel is out of balance.
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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