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12-23-2012, 12:57 PM
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#1
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Member
Join Date: Oct 2007
Posts: 92
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bath exhaust
I have determined the CFM exhaust I need for my bath to be 80; however with almost all baths, privacy with a closed door reduces the amount of airflow into the bath. My 24" door has a 1" opening at the bottom for airflow. I don't know how much air CFM this allows into the bath nor what the consequences are for my bath motor if this is insufficient.
Should I be concerned with this restricted air flow into the bath?
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12-23-2012, 01:52 PM
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#2
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Master General ReEngineer
Join Date: Dec 2007
Location: Chaumont River, Ny.
Posts: 3,160
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bath exhaust
Quote:
Originally Posted by Captflx
I have determined the CFM exhaust I need for my bath to be 80; however with almost all baths, privacy with a closed door reduces the amount of airflow into the bath. My 24" door has a 1" opening at the bottom for airflow. I don't know how much air CFM this allows into the bath nor what the consequences are for my bath motor if this is insufficient.
Should I be concerned with this restricted air flow into the bath?
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Ayuh,... That's 24 sq. inches....
How much air ya gonna push through a 4" flex-vent tube,..??
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12-23-2012, 02:07 PM
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#3
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AHH, SPANS!!!
Join Date: Apr 2012
Location: Durham NC
Posts: 1,197
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bath exhaust
spaces under doors are 5/8" up to over an inch average. as long as it is at least 5/8" off the floor the a/c-heat unit and bath fan will work just fine.
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12-24-2012, 06:01 PM
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#4
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Member
Join Date: Aug 2010
Location: dc metro
Posts: 947
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bath exhaust
yea you will be ok. i will be more concerened with the length of the duct run
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12-25-2012, 11:08 PM
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#5
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Newbie
Join Date: Dec 2012
Posts: 4
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bath exhaust
I think you must add a small decorated window (A very small one) to your door so that air can pass through it properly but make sure you don"t see on the other side from any position and like wise.
pool shop
Last edited by jasson; 12-28-2012 at 06:47 AM.
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12-26-2012, 12:56 AM
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#6
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JOATMON
Join Date: Aug 2011
Location: S. California
Posts: 4,074
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bath exhaust
Quote:
Originally Posted by jasson
I think you must add a small decorated window (A very small one) to your door so that air can pass through it properly but make sure you don"t see on the other side from any position and like wise.
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Do what? I don't believe that is any code I have seen.
__________________
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12-26-2012, 08:31 AM
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#7
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Member
Join Date: Jan 2009
Location: WV
Posts: 2,111
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bath exhaust
Quote:
Originally Posted by ddawg16
Do what? I don't believe that is any code I have seen.
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Never heard of it either. Nor have I ever seen a bathroom door with a window in it.
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12-26-2012, 09:28 AM
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#8
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Member
Join Date: Oct 2012
Location: maryland
Posts: 98
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bath exhaust
how did you determint the required cfm?
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12-26-2012, 11:30 AM
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#9
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Member
Join Date: Jan 2009
Location: WV
Posts: 2,111
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bath exhaust
Quote:
Originally Posted by gwilkrrs
how did you determint the required cfm?
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By the size of the room.
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12-26-2012, 11:58 AM
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#10
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JOATMON
Join Date: Aug 2011
Location: S. California
Posts: 4,074
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bath exhaust
Quote:
Originally Posted by gwilkrrs
how did you determint the required cfm?
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Quote:
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Suggested CFM for the bathroom is based on cycling all the air in the bathroom 8 times per hour. The bath fan calculator is standard guide to help you find the minimum fan rating for your specific bathroom. The higher the bath fan rating the more air can be vented out of the bathroom, which means less moisture and mold build-up.
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One of many web sites for calculating the cfm...
http://www.ventingdirect.com/bath-ex...culator/c16459
__________________
Common Sense is like Deodorant. Those that need it the most don't use it.
My
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The Following 3 Users Say Thank You to ddawg16 For This Useful Post:
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12-26-2012, 12:19 PM
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#11
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Newbie
Join Date: Dec 2012
Location: Selma, CA
Posts: 25
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bath exhaust
Quote:
Originally Posted by ddawg16
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Wow thank you very nice link, very helpful information. 
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12-26-2012, 04:07 PM
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#12
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Member
Join Date: Oct 2007
Posts: 92
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bath exhaust
Thanks to all for the info.
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12-26-2012, 06:52 PM
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#13
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Exterior Construction
Join Date: Aug 2011
Location: VA, MD, DC
Posts: 3,493
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bath exhaust
Quote:
Originally Posted by ddawg16
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Bookmarking that one.
Nice link.
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12-26-2012, 11:51 PM
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#14
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Moderator
Join Date: Mar 2009
Posts: 8,775
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bath exhaust
I'll stick with mine; flex duct, elbows, and roof/wall cap deductions; http://www.efi.org/factoids/bathroom_sizing.html
Lol.
Gary
PS. Termination hoods/fittings also create back pressure; from my dryer links; http://www.youtube.com/watch?v=cFOHGVhmyQA
__________________
Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!
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