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Old 09-20-2010, 08:56 AM   #1
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Where to drill 4" vent in basement wall?


Does anyone know what the code says regarding where one can drill a 4" hole to exhaust through a basement wall? I've got two options; either option would cause the hole to exhaust about 2.5'-3' above the ground outside.

1) Bore 4" hole through 12" thick foundation wall
2) Bore 4" hole through an 8" rim joist (I'm assuming it is a single 8x2" rim joist, and not two 8x2" joists laminated together)

Would prefer going option 2 - easier to drill and don't need to have a bulkhead to hide the exhaust (it can be hidden between floor joists), however, I don't know if code allows me to cut out half the rim joist to run an exhaust outside.

Thanks!

Eric

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Old 09-20-2010, 06:39 PM   #2
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Where to drill 4" vent in basement wall?


Option # 2. As long as this is pvc for a 90% furnace

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Old 09-20-2010, 07:25 PM   #3
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Where to drill 4" vent in basement wall?


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Option # 2. As long as this is pvc for a 90% furnace
Actually, not even. Need to make an exhaust for a dryer and an exhaust for a bathroom vent. Planning to use galvanized HVAC tubing.

Thx,

Eric
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Old 09-20-2010, 07:43 PM   #4
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Where to drill 4" vent in basement wall?


Your still good on option # 2.
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Old 09-21-2010, 06:52 PM   #5
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Where to drill 4" vent in basement wall?


Took a look at my installation. You probably know this but for safety I'll mention anyway. Pipe should be sloped/tilted downward towards furnace. Probably a 2 inch slope over every 10 foot run. That's so condensate runs back to furnace through pipe and to drain. Probably prevents both freezing and mold. Any condensate that makes it all the way to outside will fall to ground.

edit: Thought for furnace. Dryer doesn't matter.
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Old 09-21-2010, 07:04 PM   #6
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Where to drill 4" vent in basement wall?


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Took a look at my installation. You probably know this but for safety I'll mention anyway. Pipe should be sloped/tilted downward towards furnace. Probably a 2 inch slope over every 10 foot run. That's so condensate runs back to furnace through pipe and to drain. Probably prevents both freezing and mold. Any condensate that makes it all the way to outside will fall to ground.

edit: Thought for furnace. Dryer doesn't matter.
1/4" per foot raise from furnace to termination.

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