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Dryer Safety Alarms - LintAlert / Re: Minimum feet for installation
« Last post by JR.VOY on October 02, 2017, 03:32:50 AM »
Sean, thanks for the posting.

The LintAlert in theory should work for lengths from 12" to 50 feet, but we have taken calls from one or two installers that indicated the unit would not take a calibration on a duct run that was straight out the back exterior wall.  Basically the very very short run, coupled with a very efficient termination hood and likely using the aluminum flex would likely provide such a low back pressure that the LintAlert thinks the dryer is not on.  The present firmware in the LintAlert is looking for back pressure above .20, and in a very very efficient run, it is possible that the pressure levels would be so low the unit refuses to capture the value.  Future versions of the firmware will likely be set to an even lower number to minimize these false positives. 

Your question focuses on run length, when the termination hood style and the type of flex transition hose factor heavily into the calculation as well.  The style of termination hood can have a tremendous effect on the back pressure levels.  This chart is pretty interesting.

Hope this helps,
It is very good information.
Building Codes / Re: Hurricane resistant vent design
« Last post by Kenozeed on September 27, 2017, 10:09:00 PM »
It is a very good idea I like.
Flex, Fittings and Terminations / Re: help determining which product needed
« Last post by pattipat on September 20, 2017, 05:46:31 AM »
Thank you so much for your help.  I need to do a little more investigating to be sure what is located where in that wall, but hope to try this soon.

Thanks again,
Dryerbox and Dryer-Ell / Re: Square Pipe 4"wide by 3.25 deep
« Last post by rickharp on September 14, 2017, 12:02:54 PM »
if your "90" broke, then one may assume the 90 was a 4" round 90, assuming there was round pipe protruding from the wall. 
if that is the case, then there may be a conversion fitting above it to convert from rectangle to round.  use that fitting further up in the wall, assuming the wall is greater than 4 inches of space.  Use a short piece of round duct to penetrate the top port of the Dryerbox. 
Take pictures if you can and post them here for others and my staff to learn from.  Thanks.
Dryerbox and Dryer-Ell / Re: Dryer Ell
« Last post by rickharp on September 14, 2017, 11:55:38 AM »
Generally we recommend silver tape, but any of the options you listed have been used as well. 
Clamps are not effective in compressing the juncture. 
I have no issues with mating two 90's creating a "U". 
Hope this helps. 
Flex, Fittings and Terminations / Re: help determining which product needed
« Last post by rickharp on September 14, 2017, 11:50:33 AM »
As long as the dryer is not "stacked" or on a pedestal, then the 3D is the right receptacle. 
It can be "retrofitted", meaning, it can be mounted onto the drywall instead of mounting the unit onto the studs and doing hours of drywall repair. 
See the images at this link, especially picture series number 5

Dryerbox and Dryer-Ell / Re: Square Pipe 4"wide by 3.25 deep
« Last post by mcleodbf1 on September 12, 2017, 12:08:03 PM »
Did anyone find a solution to this.  I am torn.  Bought a dryer box.  Love the idea but see no way to get it one without big issues.  My 90 broke at wall so I must do something.  Would appreciate any suggestions.  Was considering to cut hole in dryer box to match the rectangle but even that seems challenging.
Flex, Fittings and Terminations / help determining which product needed
« Last post by pattipat on September 03, 2017, 01:01:19 PM »
I've just discovered this product and am very excited about the possibility of using it in my new home.  This will be a retrofit, 2 x 4 wall with vent going down.  It appears I need a 3D for the downward vent, but I'm unsure, from what I've seen on this website, if this is a retrofit product.  I'm reasonably handy, should I be able to install this by myself?

Dryerbox and Dryer-Ell / Dryer Ell
« Last post by Monkey on September 03, 2017, 07:53:15 AM »
Hi guys....

What do use to seal Dryer Ell Elbows ?

I feel like tape might leak ?
High Heat Silicone ?
Mastic ?
Mastic + Fiber Tape ?
Other ?

Do you guys use clamps.

I have to connect 2 x Ell 90 to create U shape any issues with that ?

Flex, Fittings and Terminations / Re: Drier vent diagonally ?
« Last post by rickharp on August 28, 2017, 09:12:03 AM »
Not totally clear on your question. 
Dryer duct can run horizontal, vertical or diagonally in an attempt to terminate to the exterior in the shortest distance with the least amount of turns. 
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