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Old 08-07-2011, 01:56 PM   #1
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Replacing a Bath Fan


The bath fan in my master bath isn't adequate to control the moisture in the room. The builders didn't consider CFMs when they installed I guess. I've purchased a replacement and I think I can tackle replacing it myself. This is my very first DIY project!

The instructions indicate I need to use spacers (provided) when mounting the unit to an I-JOIST. What is an I-JOIST and is there a lot of difference from regular joists?

Also - this may be an elementary question, but the fan didn't come with screws...what size should I use? The instructions don't specify...

Thanks!!

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Old 08-07-2011, 02:04 PM   #2
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Replacing a Bath Fan


An I joist is a type of engineered wood support that is often used in place of a traditional wood joist. Use 1/4'' - 3/4'' long sheet metal screws.

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Old 08-07-2011, 02:06 PM   #3
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Replacing a Bath Fan


Should I assume that's what I have in the ceiling?

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Old 08-07-2011, 03:17 PM   #4
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Replacing a Bath Fan


Quote:
Originally Posted by wildflower View Post
Should I assume that's what I have in the ceiling?

Thanks!
There's no reason to assume anything. You remove the old fan and look into the hole. There's no real installation variation between wood framing members. You screw the fan box to the wood. It doesn't matter if it's a joist or a truss.
If your case, you might need to install blocking unless you have access above to use the metal runners.
Check the condition of the ductwork and make sure it vents to the exterior.
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