Forum Discussion
Skibane
Nov 05, 2021Explorer II
PerryB67 wrote:
I said open a window to 1/4-1/2" not a full inch. You don't need much for intake
In residential heating, a typical recommendation is 1 square inch of opening for every 4,000 BTUs of heater.
Using that guideline, a 3,000 BTU catalytic heater would need at least 0.75 square inches.
So, if your window is 12 inches high, you would only need to crack it open by about 1/16th of an inch to get that 0.75 square inches.
Add in another 100% safety margin, and you're still at only 1/8th of an inch.
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