bathroom vent fan duct positioning question


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Old 08-09-21, 06:40 PM
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Unhappy bathroom vent fan duct positioning question

I'm in the process of replacing the bathroom vent fan in a house that was constructed in the 60s. I purchased a Delta Breez Elite Series 110 CFM replacement fan but ran into a problem where the plastic duct end of the fan (https://images.thdstatic.com/product...10h-31_600.jpg) doesn't fit in the existing space due to a piece of wood mounted horizontal to the joists (see attachment).

I can cut a opening in either direction so my question is should I position the fan where the plastic duct is facing the direction of the yellow (in the attachment) and run a 45 degree elbow to run it directly up the roof like in post#12 of in 90 degree elbow for Bathroom exhaust duct or the opposite direction (red arrow).



 
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Old 08-09-21, 07:05 PM
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Welcome to the forums.

That wood is called blocking and was installed to mount the old fan.
It can be modified or removed as needed for your new fan.
 
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Old 08-10-21, 10:04 PM
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For the fan duct routing - should it point towards the yellow arrow where I do a 45 degree elbow where it would connect to a higher point of the roof for the bathroom vent cap or the other direction (red allow) where the vent cap would be on the lower end of the roof?
 
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Old 08-10-21, 10:47 PM
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You don't say where your located but that attic insulation appears to be very thin and inadequate, a big comfort and money saving project there!

You don't state what your plan is for terminating the duct?
 
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Old 08-11-21, 12:17 AM
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I don't really think it makes a difference. Pick the easiest way to work.
 
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Old 08-11-21, 09:55 PM
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Marq1 yes the insulation is thin for south Louisiana. I plan to terminate the other end of the bathroom vent fan duct to the roof but unsure if it matters if the bathroom vent cap on the high end of the roof or the low end of the roof.
 
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Old 08-11-21, 10:11 PM
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You could pick the area easiest to work in. Since a powered fan doesn't rely on drafting it doesn't make a difference if it's higher or lower on the roof.
 
 

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