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Dryer Duct Boosters  Rating:  Rating
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 Posted: Tue Mar 2nd, 2010 04:35 pm
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Tim M
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    Looking at dryer problems with a 30 or 40 foot run of duct and 3 elbows.

Has anyone used something like this:
http://www.rewci.com/dryer-duct-booster-lint-blitzer.html

and do you have any thoughts or recommendations?

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 Posted: Tue Mar 2nd, 2010 05:26 pm
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appl.tech.29501
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Haven't used that particular one but that would be the one I would buy the next time...I like the idea of the pressure switch initiate as opposed to the hard wired type



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 Posted: Tue Mar 2nd, 2010 08:05 pm
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Tim M
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.   Was just looking at the home page:
http://www.tjernlund.com/
and the literature:
http://www.tjernlund.com/Tjernlund_LB1_Dryer_Duct_Booster_8504142.pdf
http://www.tjernlund.com/distributor/Distributor_document_Library.htm#instructions

and it seems like not only would it not fit easily behind the dryer anway at 11" deep, it can't be installed within 15' of the dryer anyway.  Also not within 1' of elbows.  Given that in my case the elbows start in the wall behind the dryer and make three quick turns to go under the floor (above the next apartment), it looks like I would have to put an elbow on the dryer to go up, then two more to go down.  That adds 15' for the elbows, plus another 10' for the ducting.  That still leaves an allowable 75' equivalent to run outside.



.  Anyone know of a dryer that is happy to blow a 55' foot equivalent?


Attachment: dryer_btn.jpg (Downloaded 54 times)

Last edited on Tue Mar 2nd, 2010 08:28 pm by Tim M

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 Posted: Tue Mar 2nd, 2010 08:26 pm
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Tim M wrote: ...  the elbows start in the wall behind the dryer and make three quick turns to go under the floor (above the next apartment), it looks like I would have to put an elbow on the dryer to go up, then two more to go down.  That adds 15' for the elbows, plus another 10' for the ducting...
and the entire length of this Vent (with and without the Booster Fan)
is accessible to clean often so as not to start a fire ?

 



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 Posted: Tue Mar 2nd, 2010 08:42 pm
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Tim M
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RegUS_PatOff wrote: and the entire length of this Vent (with and without the Booster Fan)
is accessible to clean often so as not to start a fire ?
.

NO!  That's what I dislike about this whole thing and I can't believe the building inspector allowed it!  It has no Booster now, though all that is added to accomodate it would be accessible.

What is there now is 40ish feet between the third level's floor and the second level's ceiling, with 3 elbows buried in the floor and the wall.  Get out a ladder and useone of these with a 10 or more extensions and you might get it clean. 


For now, the one I was refering to is clean.  My regular 10' brush and a 50' fish tape took care of it with a ladder and a lot of hassle.

Attachment: linteater.gif (Downloaded 54 times)

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 Posted: Thu Jul 15th, 2010 04:18 am
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Tim M
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http://dryer-ell.com/new/dryer-ell_welcome.asp

.     But then you don't need to get a blower at all if you use elbows with a 10" radius like these.



.    These are so low friction they count as NO elbow.

.    If I used them for every turn on the dryer I'm working on now, I could go 60 feet.  I'll probably put one hard turn behind the dryer.  Then use this up at the ceiling and near where it exits the wall, so I can go 52 feet.  I've only got 40 feet of ducting not counting elbows, so someone could even put in a dryer with less oomph and still make it.

.   Worth it to post it for the next guy or gal though:

So they check the manual of the new dryer.  Not that whomever installed this one did that.


Last edited on Thu Jul 15th, 2010 10:29 pm by Tim M

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 Posted: Thu Jul 15th, 2010 08:04 am
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Tim M wrote: .. What is there now is 40ish feet between the third level's floor and the second level's ceiling, with 3 elbows buried in the floor and the wall... 

I wouldn't touch it.

(unless it was mine  .. I'd re-locate the Dryer) ..

may be to much liability ..

You try and do a good job of cleaning..

Later, fires starts in Vent ..

Who ya gonna call ?



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 Posted: Thu Jul 15th, 2010 10:52 pm
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Tim M
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.    Thanks for the help, but you're replying to a much older post.  I didn't touch that one.  I wasn't going to rip the whole floor apart and he wasn't interested in the much needed booster.  The 40 feet in the floor was something ages ago.

.    I am currently working on something with a long (mostly exposed) run.  I just posted here add to this thread so others who read it consider using some of the ells from my last reply instead of adding a booster fan.

.    For the current one the chart below shows his exhausting requirements.

.    By changing the vent hood from 2" to 4" and removing about 4 unneccesary elbows, changing the last 7' to be 5' of rigid like the first 33.  Then changing the remaining 90 and two 45s to ells.  I have one 90 elbow (if any) in the whole shebang.  That means that instead of having something not even on the charts, it had so many crazy turns, that now I have about 38' equivalent duct length, when the specs say it can handle 52 to 60 feet (depending on whether I put an elbow at the back of the machine or an ell).

.    Just thought it would be useful to have some post up here about booster fans and ells, for when we run into some bad work someone else did where the dryer can't be moved.  I hadn't seen any references on this site to ells, and how they improve safety and that code counts them the same as straight pipe.


Attachment: ductlength.jpg (Downloaded 35 times)

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 Posted: Thu Jul 15th, 2010 11:45 pm
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appl.tech.29501
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Tim M wrote:

.    By changing the vent hood from 2" to 4" and removing about 4 unneccesary elbows, changing the last 7' to be 5' of rigid like the first 33.  Then changing the remaining 90 and two 45s to ells.  I have one 90 elbow (if any) in the whole shebang.  That means that instead of having something not even on the charts, it had so many crazy turns, that now I have about 38' equivalent duct length, when the specs say it can handle 52 to 60 feet (depending on whether I put an elbow at the back of the machine or an ell).




The specs may say 52-60' but I have yet seen a dryer perform to efficient standards with a perfect vent layout in excess of 30'.



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 Posted: Fri Jul 16th, 2010 12:16 am
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Tim M
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appl.tech.29501 wroteThe specs may say 52-60' but I have yet seen a dryer perform to efficient standards with a perfect vent layout in excess of 30'.

"In excess of 30 feet" with how many 90s and how many 45s?

For the dryer in this example
http://i160.photobucket.com/albums/t200/Zenzoidman/Dryers/vent-length.jpg

even having ONE elbow puts you down to 33 feet.  Having none with the right vent hood and rigid pipe is a different story.  I've never seen any 30' installation with either no elbows or using ells to create the equivalent of no elbows.  I'm sure you've seen a lot more dryers than I.

.   What's in there now is 33' rigid with 4 90s and 7' of flexible with three unnessary 90s.  Just to make the math easy, lets say each 90 counts as 8' and each ell as 0.  Also that roughly flex counts as double rigid and a 2 inch vent counts as 12'. 
33+(4*8)+(7*2)+(3*8)+12=115

That drops to either 38+0 or to 38+8, if I use one 90, well below 60' in either case.

.    I can see the duct layout of 30' causing problems for some dryers given that any layout that long will be bound to have at least two 90s.  In the above examples that gives you an EDL of 23 feet, and you are well over limit.  If the EDL is 30 that is a different story.


Last edited on Fri Jul 16th, 2010 12:42 am by Tim M

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 Posted: Fri Jul 16th, 2010 04:17 am
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appl.tech.29501
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i've seen a few that were spec'd to 40' with new rigid pipe, 4" vent hood, no 45's or 90's. brand new units straight out the boxes straight runs from the dryer exhausts for 30' and would take 100-120 minutes to dry a load.

I am very interested in trying some of the "Ell's", thankyou for posting that link.



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 Posted: Fri Jul 16th, 2010 12:50 pm
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Tim M
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. Wow. I would have never thought that there was a dryer configuration like that.

. I'm hoping since I'm this far under specs we are OK as long as I post the specs needed for future dryers. I'd also really like to avoid the noise of a booster fan, since it is in a business that needs quiet.

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 Posted: Fri Jul 23rd, 2010 06:35 pm
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Tim M
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From my other post on duct cleaning
http://applianceguru.com/forum27/23720.html




I may also consider one of these:
.    OK, I've posted on Lint brushes, duct booster fans, and dryer duct ells.  Thought I'd round out the topic with this.



http://www.lintalert.com/

It senses backpressure in the dryer duct due to lint buildup and trips an alarm  From the website:The LintAlert® is a smart, easy-to-install home safety device that uses pressure differential technology to monitor your dryer's ventilation system. When any blockage occurs, back pressure is produced. When a dangerous level has been detected the device will initiate an alert mode. The SmartTap™ fitting is installed in the transition hose at or near the dryers exhaust port and is connected to the alarm module by the 1/8" tube.
http://shop.dryerbox.com/s.nl/it.A/id.236/.f

Last edited on Fri Jul 23rd, 2010 06:41 pm by Tim M

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 Posted: Fri Jul 23rd, 2010 07:39 pm
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This is a great gizmo that every dryer should have on it. Thanks for posting this, Tim. I've added to my a-store.



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 Posted: Fri Jul 23rd, 2010 07:42 pm
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appl.tech.29501
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That's pretty cool, I couldn't view the video for some reason. I'm curious at what pressure it's configured at and if that set point is adjustable (I assume not).



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 Posted: Sat Jul 24th, 2010 04:50 am
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Tim M
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appl.tech.29501 wrote: That's pretty cool, I couldn't view the video for some reason. I'm curious at what pressure it's configured at and if that set point is adjustable (I assume not).

.    I couldn't view the video either, but the pressure set point must be adjustable.  See this from the video page:
Four minute video demonstrating the technical aspects of the LintAlert®. Topics include three calibration attempts and advanced description of the firmware.
http://www.lintalert.com/lintalert_video.htm
Tim

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 Posted: Sat Jul 24th, 2010 05:09 am
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i just read the story, makes more sense and answered my questions. I hope to try one of these soon.



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