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Old 02-14-2010, 11:52 PM   #1
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Rectangle Exhaust Vent


The floor joists in my basement are partially in the foundation so my rim joists are half concrete half wood.

I need to cut a 6" hole for an exhaust outlet for a HRV.

There is an existing 3.25 x 10. rectangle vent.

Can I just put a 3.25 x 10 x 6 angle boot and get the equivalent air flow?

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Old 02-15-2010, 09:48 PM   #2
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Rectangle Exhaust Vent


Basically, yes. It will boil down to manufacturer specs and the tempermant of your local inspector.

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