Venting Bath Fan - General DIY Discussions - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > DIY Repair > General DIY Discussions

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 12-04-2010, 11:00 PM   #1
Newbie
 
Join Date: Sep 2007
Location: New Mexico
Posts: 29
Rewards Points: 25
Default

Venting bath fan


I'm going to try installing a bath fan in my 1950s building, right now there isn't one. I was hoping to be able to vent straight out the side between the joists, but there are some cross braces in the way and I'd have to go through both concrete block and (old school) stucco.

If I go straight up, I'll have to have an almost immediate elbow which the directions say not to do. The total vent run is going to be only about 18", since it's a flat roof. Seems to me that it will still be fine, but maybe not? If I do that, should I put in 2 x 45 degree elbows instead of 1 x 90? I have about four feet that is clear of bracing, but of course the fan accounts for some of that.

Would be nice to have some idea before I put it in completely wrong.

Also, do I have to use metal vent or can I use PVC?

Thanks!

Advertisement

Genhawk21 is offline   Reply With Quote
Old 12-05-2010, 02:01 AM   #2
Member
 
Join Date: Dec 2008
Location: Fairbanks, AK
Posts: 1,847
Rewards Points: 1,000
Default

Venting bath fan


no bends? check on a panasonic whisper green. an elbow should be no problem, and they (at least some) will adjust themselves to make sure they are putting out what they are designed to do under different installation configurations. they are very quiet and somewhat programmable. whatever you do, seal the vent pipes impeccably. i don't think the type of pipe matters to the fan, but the "normal" stuff is cheap and easy to wiggle around stuff. i ran mine into the abs out the roof; what can it hurt? seal, seal, seal.

Advertisement

jklingel is offline   Reply With Quote
Old 12-05-2010, 10:09 AM   #3
Member
 
Join Date: Mar 2007
Location: Long Island, NY
Posts: 9,519
Rewards Points: 2,000
Default

Venting bath fan


Just take out the cross bracing. I'm pretty sure the joists have stabilized by now. You can always pop in a 2x4 at the bottom, laying flat.
Ron
Ron6519 is offline   Reply With Quote
Old 12-05-2010, 10:09 AM   #4
Household Handyman
 
Join Date: Feb 2009
Location: Albany, Ga.
Posts: 2,299
Rewards Points: 1,050
Default

Venting bath fan


Key wording here: Flat roof. Unless you have experience with dealing with flat roofs, placing any protrusions up through them and sealing this--maybe not a good idea there either. Use the metal piping. Trying to fit PVC while up in the attic is not a good thing. As stated, fit it properly, and seal properly. Using two 45's instead of one 90 will always give better flow properties--IF you have the room to do so. It doesn't sound as if either direction is going to be easy.
Thurman is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Venting bath fan through drain vents? DangerMouse Plumbing 14 07-16-2010 02:01 PM
Bath fan venting BillPa General DIY Discussions 3 07-11-2009 03:40 PM
Switching the Plugs in Bath Fan/Light MrBill_DIY Electrical 3 12-01-2008 07:45 PM
bath fan venting ponch37300 Remodeling 8 09-14-2008 09:14 AM
Complex challenge with bath exhaust fan - need help with solution! Honest Bill Electrical 6 11-02-2007 03:52 PM




Top of Page | View New Posts