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Discussion Starter · #1 ·
I need to install a fresh air intake to the basement, and wondering what sort of clearance I should have from the ground. I've got a bit over 2 feet between ground level and the subfloor. I'm in Minnesota, so I ask because of the potential for snow to block the intake.
 

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Discussion Starter · #5 ·
Forgot to ask this one earlier....what diameter of pipe do I need for this? It's a 105K boiler and a 30K water heater in an open 900 sqft basement. I'm actually puzzled by the need for the air supply, but the guy who's servicing our water heater (under warranty) won't do the work until after one is installed.
 

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By code, 68 sq inches of cross section. 9" round. Many contactors just run a single 6".
 
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