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Old 12-31-2009, 09:10 PM   #1
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Dryer vent backdraft damper


My dryer vents through the wall through a crawlspace to an outside wall. I replaced the 15 year old venting today... In the process, I added a Deflect-O Back Draft Damper... It is heavy duty plastic... I mounted it on the wall where the dryer vent leads into the crawlspace... this damper is about three feet from the dryer.

My question is... with it being plastic, is this a problem with the heat from the dryer? Doesn't seem to be an issue, even though the hose clamp holding the dryer vent to it is quite warm.

Thank you.
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Old 12-31-2009, 10:05 PM   #2
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Dryer vent backdraft damper


Take it out, do not use it. It will stop and collect lint leading to clogging and a possible fire hazard.

The backdraft damper is required to be at the duct termination for dryers.

The pipe should be smooth metal inside with the male ends of pipe facing direction of air-flow. (NO plastic, NO obstructions)

No screws permitted and 4" minimum size required as per code.

Use an "A type" door, 50% more airflow: http://www.appliance411.com/faq/dryer-vent-length.shtml


http://www.hcpdc.com/pdf/Dryer%20Ven...quirements.pdf


http://docs.google.com/viewer?a=v&q=...up65cYgFwMvULw
Be safe, Gary
__________________
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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Old 12-31-2009, 10:53 PM   #3
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Dryer vent backdraft damper


Excellent post, Gary. Thank you!

What is your recommendation for getting the duct through the wall, then? Just run it straight through and insulate around it? Or use some sort of connector that fastens to the wall (much like this damper does)?
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Old 01-01-2010, 06:31 AM   #4
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Dryer vent backdraft damper


Go to HD or LO___ and purchase a dryer vent with the damper already attached drill the hole install the vent then pipe up to and into it with the 4" pipe from the dryer. Make sure the pipes are facing the proper direction and they are taped tight.
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Old 01-01-2010, 02:26 PM   #5
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Dryer vent backdraft damper


I would run straight smooth metal pipe, with 45* elbows (unless close to the max. on elbow deductions) right through the crawl door/plywood. Oversize the hole, add metal tin pieces (overlapping at center circle cutout), use Type A hood with aluminum foil tape at all joints, including each individual elbow. If a gas exhaust also, follow codes sited- 3' from openings, etc. Don't forget to use stainless steel flex hoses on the water supply to the clothes washer (no burst).

Be safe, Gary
__________________
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!
Gary in WA is offline   Reply With Quote
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