Forums | Home Repair | Home Improvement | Painting | Interior Decorating | Remodeling | Landscaping


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 11-15-2011, 07:36 PM   #1
Newbie
 
Join Date: Nov 2011
Posts: 3
Share |
Default

Bathroom Vent Hose Setup


Hi,

I had a company install a new bathroom vent hose this week. The original one vented to the attic with an uninsulated hose. The new one they installed is an insulated flex hose that now runs to a proper vent through the roof.

The problem I'm experiencing is that the fan doesn't exhaust as well now as it did when it had the uninsulated hose that vented to the attic. When I get out of the shower, the mirror is completely covered in condensation whereas before it was not and takes significantly more time to clear the room of humidity.

I assumed the issue was due to the new hose having several bends in it, whereas the old one was basically straight. It takes 1 45 and 2 90 degree angles (45 in the hose, 90 in the hose, 90 to exit the roof vent).

By looking at the attached picture, is the new flex hose installed correctly?
Attached Thumbnails
Bathroom Vent Hose Setup-bathroom-vent-hose-1.jpg  
incufilter is offline   Reply With Quote
Old 11-15-2011, 07:45 PM   #2
Member
 
Join Date: Oct 2011
Location: pa
Posts: 3,986
Default

Bathroom Vent Hose Setup


how big is this fan that it requires a 6" insulated duct....I think this is your problem..... looks like way over size pipe....what did they take out. what is going through roof.... what size is your fan..

Last edited by ben's plumbing; 11-15-2011 at 07:58 PM.
ben's plumbing is offline   Reply With Quote
Old 11-15-2011, 07:56 PM   #3
fabrk8r
 
fabrk8r's Avatar
 
Join Date: Feb 2010
Location: Iowa
Posts: 849
Default

Bathroom Vent Hose Setup


Quote:
Originally Posted by incufilter View Post
is the new flex hose installed correctly?
No it isn't installed correctly.

The flex duct should have no kinks and be stretched fairly tightly to provide proper air flow. And as Ben said, it should probably be 4" flex unless you are using an industrial/commercial vent fan.

You should call the installer back and point this out.
__________________
"The physician can bury his mistakes, but the architect can only advise his clients to plant vines." -- Frank Lloyd Wright
fabrk8r is offline   Reply With Quote
Old 11-15-2011, 08:34 PM   #4
Chicago, IL
 
Michael Thomas's Avatar
 
Join Date: Jan 2008
Location: Chicago, IL
Posts: 1,037
Default

Bathroom Vent Hose Setup


What you have there is a big P trap for condensed exhaust...
__________________
Home Inspections, Infrared (Thermal Imaging) Leak Identification and Inspection Services, Roof, Attic, Building, Basement and Foundation Moisture Intrusion and Water Leak Inspections, Troubled Building Consultations - Serving Chicago and Suburbs
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Michael Thomas is offline   Reply With Quote
Old 11-15-2011, 08:39 PM   #5
Newbie
 
Join Date: Nov 2011
Posts: 3
Default

Bathroom Vent Hose Setup


The fan is 100cfm
Through the roof it goes to a vent port they just installed. I believe it's a 90 degree downward slope facing vent opening.

Not sure what the old vent hose size was. It was uninsulated so it's hard for me to compare the two. It's still sitting up there in the rafters if a picture helps?
I figured it was the same size just covered in insulation.
Can you tell it's a 6" just by looking? I couldn't find any markings on it that designated the size.

I asked the tech why it was curved 90 degrees and they said it was so no moisture would drain back toward the fan and cause a fire. I have looked this up by googling it but everyone seems to have a different opinion. Some say straight is perfect, others say it has to be bent part way to avoid moisture draw back to the fan.
incufilter is offline   Reply With Quote
Old 11-15-2011, 08:46 PM   #6
Member
 
Join Date: Oct 2011
Location: pa
Posts: 3,986
Default

Bathroom Vent Hose Setup


on 100 cfm seems like 4"would be required to exhaust ....however as was mentioned maybe try getting pipe straighter and strecth it ....why is the roof vent so far from fan anyway......closer and straighter always better.....
ben's plumbing is offline   Reply With Quote
Old 11-16-2011, 09:58 AM   #7
fabrk8r
 
fabrk8r's Avatar
 
Join Date: Feb 2010
Location: Iowa
Posts: 849
Default

Bathroom Vent Hose Setup


Quote:
Originally Posted by incufilter View Post
I asked the tech why it was curved 90 degrees and they said it was so no moisture would drain back toward the fan and cause a fire. I have looked this up by googling it but everyone seems to have a different opinion. Some say straight is perfect, others say it has to be bent part way to avoid moisture draw back to the fan.
If there is condensation forming on the inner walls of the flex duct then there are several things that are causing this.

1. Vent fan not moving enough air.
2. Fan is not run long enough after shower to exhaust all moisture from room and vent pipe.
3. Inadequate insulation on vent pipe.
4. Improperly run vent pipe causing restriction.

There should be as few bends, kinks and turns as possible in any run of flex vent.
__________________
"The physician can bury his mistakes, but the architect can only advise his clients to plant vines." -- Frank Lloyd Wright
fabrk8r is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Vent for basement bathroom group chadmills Plumbing 1 10-29-2010 03:03 PM
attach dryer vent hose Peppermint Site Help and Suggestions 2 08-06-2010 02:38 PM
Attic Ventilation Question handy man88 Roofing/Siding 10 02-12-2010 10:50 PM
bathroom vent leaking listo HVAC 3 01-24-2009 06:15 PM
Bathroom Vent Not Vented to Outside / Would need to vent through flat roof House_Amuck HVAC 5 03-30-2007 09:57 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.