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

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-09-2011, 08:48 AM   #1
Member
 
Join Date: Oct 2006
Location: georgia
Posts: 292
Rewards Points: 0
Share |
Default

dryer venting


I will be using metal ducts of course and the run with the least # of elbows will drop down into crawl, needs to go underneath a double beam, then run between joists and I have a straight run of about 10' where I need to angle duct slightly upwards to exit through band board (I am pretty sure i can do this part w/out an elbow) . total run @ 20'. It isn't that big of a deal to run duct "uphill" like this is it? thanks


Last edited by ugabulldog; 01-09-2011 at 08:51 AM.
ugabulldog is offline   Reply With Quote
Old 01-09-2011, 09:53 AM   #2
Member
 
Join Date: Oct 2009
Location: Nebraska
Posts: 2,362
Rewards Points: 0
Default

dryer venting


Direction doesn't matter with a drier vent. Twenty foot, including the equivlant length for elbows, is good. It's been a while since I did any duct work but I believe an el is equal to 5' of hard pipe.

Marty S. is offline   Reply With Quote
Old 01-09-2011, 10:24 AM   #3
Chicago, IL
 
Michael Thomas's Avatar
 
Join Date: Jan 2008
Location: Chicago, IL
Posts: 1,037
Rewards Points: 0
Default

dryer venting


If it's an unheated crawl, and you are in a cold climate, you may get condensation in the exhaust line, which will run downhill to the low point of any "reversed pitched" sections.

This condensation can be substantial:

Homeowner account of water build-up in dryer vent

and I have seen large pools of water condensed in clothes dryer exhausts standing on plastic vapor barriers at crawl space floors at home inspections here in Chicago.
__________________
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 http://paragoninspects.com/

Last edited by Michael Thomas; 01-14-2011 at 05:02 AM.
Michael Thomas is offline   Reply With Quote
Old 01-09-2011, 06:35 PM   #4
#1 HAWKEYE FAN
 
hardwareman's Avatar
 
Join Date: Oct 2010
Posts: 1,545
Rewards Points: 0
Default

dryer venting


most dryers can be vented a total of about 35' without any problems. you must include elbows which will be equivelant to 4' per elbow. but as was mentioned I'd be very concerned about running uphill as it will build up condensation and lint
hardwareman is offline   Reply With Quote
Old 01-09-2011, 09:03 PM   #5
Member
 
Join Date: Oct 2006
Location: georgia
Posts: 292
Rewards Points: 0
Default

dryer venting


Aren't a good many vents run vertically??? (which is alot more sloped obviously than I'm talking about)...
ugabulldog is offline   Reply With Quote
Old 01-10-2011, 01:06 AM   #6
Newbie
 
Join Date: Jan 2011
Posts: 29
Rewards Points: 0
Default

dryer venting


My dryer vent is pretty much vertical
bbguy5 is offline   Reply With Quote
Old 01-10-2011, 04:14 AM   #7
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 25,058
Rewards Points: 4
Default

dryer venting


Quote:
Originally Posted by ugabulldog View Post
Aren't a good many vents run vertically??? (which is alot more sloped obviously than I'm talking about)...
Most of those vertical ones. Are insulated, and or the majority of the run is in conditioned space, or inside a interior wall that is warmer then your crawlspace. So condensate formation isn't a problem.

Those vertical runs that are not insulated, are also often the ones that clog up with lint in a very short time. Due to condensate allowing the lint to collect in the pipe quicker.
beenthere is online now   Reply With Quote
Old 01-10-2011, 08:56 PM   #8
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Rewards Points: 0
Default

dryer venting


ug, make sure it is wrapped with insulation and a v.b. Use 45* elbows rather than 90*s for less resistance of the air-flow. Use a Type “A” hood for 50% more exhausting opening; http://www.appliance411.com/faq/dryer-vent-length.shtml

Follow the manufacturer’s suggestions for duct length/elbows/etc.

Termination hood minimum 3’ from any building openings, furnace air supply, doors, operable windows, etc.; http://publicecodes.citation.com/ico...002_par002.htm

Foil tape all joints, even on the independent elbows that you don’t adjust. 45 down, then run level, 45 up so the angle ducting length is shorter…..

Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
Old 01-11-2011, 06:08 AM   #9
Chicago, IL
 
Michael Thomas's Avatar
 
Join Date: Jan 2008
Location: Chicago, IL
Posts: 1,037
Rewards Points: 0
Default

dryer venting


Quote:
Originally Posted by GBR in WA View Post
Termination hood minimum 3 from any building openings, furnace air supply, doors, operable windows....
... and air conditioner condenser units.
__________________
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 http://paragoninspects.com/
Michael Thomas is offline   Reply With Quote
The Following User Says Thank You to Michael Thomas For This Useful Post:
Gary in WA (01-11-2011)
Old 01-11-2011, 03:46 PM   #10
Member
 
Join Date: Oct 2006
Location: georgia
Posts: 292
Rewards Points: 0
Default

dryer venting


Quote:
Originally Posted by GBR in WA View Post
ug, make sure it is wrapped with insulation and a v.b. Use 45* elbows rather than 90*s for less resistance of the air-flow. Use a Type A hood for 50% more exhausting opening;
Gary
what is a v.b.? thanks
ugabulldog is offline   Reply With Quote
Old 01-11-2011, 05:05 PM   #11
Chicago, IL
 
Michael Thomas's Avatar
 
Join Date: Jan 2008
Location: Chicago, IL
Posts: 1,037
Rewards Points: 0
Default

dryer venting


Quote:
Originally Posted by ugabulldog View Post
what is a v.b.? thanks
Vapor barrier, goes on outside of insulation when insulating a dryer exhaust line, in this illustration it's the foil on the outside of the insulation.



Note: The above picture illustrates a vent for a bathroom fan, code prohibits the use of fasteners protruding into dryer vents as they can catch lint.
__________________
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 http://paragoninspects.com/

Last edited by Michael Thomas; 01-14-2011 at 05:04 AM.
Michael Thomas is offline   Reply With Quote
Old 01-12-2011, 07:18 AM   #12
Member
 
Join Date: Oct 2006
Location: georgia
Posts: 292
Rewards Points: 0
Default

dryer venting


Quote:
Originally Posted by GBR in WA View Post
Foil tape all joints, even on the independent elbows that you don’t adjust. 45 down, then run level, 45 up so the angle ducting length is shorter…..

Gary
so you're saying it is better to add an extra set of 45 elbows (where the elbows would have toslope down at low spot) and have pipe slope down than to slope pipe up at @ 5 degree angle for 10' and eliminate that set of 45 elbows?
ugabulldog is offline   Reply With Quote
Old 01-13-2011, 08:37 PM   #13
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Rewards Points: 0
Default

dryer venting


The 45's are better at not restricting the air flow (catching condensation/lint sticking) than a 90*. You can slope the pipe without an ell, fine. Just try to keep the air flow without SHARP bends (turbulence).

Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
Old 01-13-2011, 09:25 PM   #14
Member
 
Join Date: Mar 2010
Location: New York
Posts: 1,743
Rewards Points: 0
Default

dryer venting


The foil tape as mentioned is a must, not duct tape which is ironically, not for ducts. Also no sheet metal screws. They catch lint. A run like that also needs to be cleaned out with a vent brush. Browse through my project thread Jim's downstairs bathroom project to see what can happen with a poorly installed dryer vent under the floor.
Jim F is offline   Reply With Quote
Old 01-13-2011, 09:58 PM   #15
BLB
Newbie
 
Join Date: Jan 2011
Posts: 5
Rewards Points: 0
Thumbs down

dryer venting


BLB any up hill 45 or90 "will collect lint " clean offen.Ever seen a flash lint fire from static electricity and fire hazard.wosh instant blaze.

BLB 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
dryer venting too short? Mike L Appliances 11 09-23-2009 11:26 PM
Venting bathroom vent thru dryer duct jredrocker HVAC 2 09-27-2008 10:25 PM
Question about dryer venting jimithing78 HVAC 10 08-26-2008 11:37 AM
Venting bathroom through dryer? phantoz HVAC 3 09-08-2007 11:53 AM
Venting Dryer Through Roof Thirdeye General DIY Discussions 1 03-04-2007 11:06 AM




Top of Page | View New Posts

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