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Rectangle Exhaust Vent

2K views 1 reply 2 participants last post by  brandonmcginnis 
#1 ·
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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