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ApplianceGuru.com: The Samurai Appliance Repair Forums > Do-It-Yourself Appliance Repair Help > The Laundry Appliance Repair Forum > what is the max. length for a dryer vent? |
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| Moderated by: RegUS_PatOff, BrntToast, appl.tech.29501 | Search Our Sites for More Info! |
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| what is the max. length for a dryer vent? | Rate Topic |
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| Posted: Fri Oct 6th, 2006 03:33 pm |
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1st Post |
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tabcom Grasshopper
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My Amanda Gas Dryer (ALG43RAW) is in my basement. The dryer vent runs from the floor to the ceiling at a forty-five degree angle and then along a wall out to an exterior window vent. Approx. 15 feet in length. Is this configuration too long? tabcom
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| Posted: Sat Oct 7th, 2006 01:14 am |
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2nd Post |
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donn Master Appliantologist
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sounds like you're boarderline -- are you using flex or rigid? rigid smooth wall 28 feet with 4 elbows -- metal flex 20 feet w/4 elbows--the outside terminal should have a 4" opening. (general rule of thumb each elbow=4 feet of run)--- info taken from speed queen/amana dryer installation guide Last edited on Sat Oct 7th, 2006 11:05 pm by donn ____________________ over 33,000 appliances repaired since 1978 |
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| Posted: Sat Oct 7th, 2006 01:47 pm |
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3rd Post |
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Samurai Appliance Repair Man Fermented Grand Master of Appliantology 
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Depends on the type of venting material and the type of exhaust hood...
____________________ To ask a question, use our new forums==> http://appliantology.org 365-Day No-Hassle Return Policy on all parts purchased through this site, even electrical parts that have been installed! |
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| Posted: Sat Oct 7th, 2006 05:19 pm |
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4th Post |
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tabcom Grasshopper
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Thank you kindly. This alleviates much anxiety for my wife.  Which in turns, allows me to move on to a defective timer switch in my dryer that is on order.
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| Posted: Sun Oct 8th, 2006 08:31 pm |
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5th Post |
asteysn2
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Trying not to get too technical but a "good" vent length is one that will not cause the "static pressure" to rise above 1/2 to 3/4 inch W.C. A rise in static pressure will mean an accompanying drop in velocity pressure, as the two are inversely related. Anything that will cause a rise in SP should be avoided as it will slow down air movement through the dryer. Avoid long runs (12 feet and on would be considered long) Avoid multiple bends. (a 90 deg bend is the same as effectively adding 5-9 feet of line) I saw a house dryer instalation last month where the actual length of the run was about 35 feet, and there were 4 90 deg bends in it as well. Thats about 63 feet of effective run! Since there was no way the run could be shortened, I installed a dryer boost fan in the last 1/3 of the run with a current sensing switch to activate it. BTW, if youre wondering what the dryer insides and the venting looked like, it was about as clogged with lint as one can be... A REAL FIRE HAZARD One more thing to consider.... why is it that we commonly light a fire in a lint filled machine and theres no fire extinquisher anywhere in the vicinity??? Bob Sankie, Coastal Appliance, Heating & A/C Serving San Diegos North County http://www.coastalappliances.com
____________________ Robert Sankie Coastal Appliance, Heating & Air Website: http://www.coastalappliances.com email: coastalserve@gmail.com |
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| Posted: Sun Oct 8th, 2006 10:01 pm |
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6th Post |
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Mad Mac Fellow, Academy of Sublime Masters of Appliantology 
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Firstly.,..welcome back Bob! To add to Bob's excellent summary of venting science, modern (since about 1988) dryers do not do a good job of pushing upwards. Many modern homes have the laundry room stuck well away from an outside wall, necessitating a long run which often contains an upward run of some kind. Root of the problem is that the house builders do not talk to people like us in the appliance repair trade. They do not, AFAIK, talk to the appliance manufacturers. Finally, great point re the fire extinguisher. I can't honestly recall ever seeing one in a laundry room on my travels...anyone?
____________________ Mad Mac....Pray to God he's out there....somewhere. |
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| Posted: Sun Oct 8th, 2006 10:05 pm |
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7th Post |
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nickfixit Fellow, Academy of Sublime Masters of Appliantology 
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Good point Bob. I wonder how many homes could be saved each year if we all had a few fire extinguishers in key areas of the home? Nick
____________________ " Giving numerical data to Sears management is like giving a monkey a machine gun. No one knows for certain what will happen, but you can be sure of two things... It will be real messy, and only the monkey will be unharmed" |
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| Posted: Mon Oct 9th, 2006 01:37 pm |
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8th Post |
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Samurai Appliance Repair Man Fermented Grand Master of Appliantology
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Mad Mac wrote:Finally, great point re the fire extinguisher. I can't honestly recall ever seeing one in a laundry room on my travels...anyone? Only one time, and the guy was a volunteer fireman. We have ours right outside the laundry room, the reasoning being that we want to be able to enter the room with the fire extinguisher already in hand instead of trying to get to the fire extinguisher with a blaze in progress.
____________________ To ask a question, use our new forums==> http://appliantology.org 365-Day No-Hassle Return Policy on all parts purchased through this site, even electrical parts that have been installed! |
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