Install dryer duct booster or find a shorter vent route?

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Old 11-22-09, 04:09 PM
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Install dryer duct booster or find a shorter vent route?

We have a dryer vent that runs in our basement and then leading outside of our home 30 ft. Our brand new dryer still runs way too long.

Should I find a shorter vent route by moving the vent outlet location? If I do this I can cut it down to 15 ft.
Total cost $30-$50

or should I buy a dryer duct booster like this one?
Total cost $275
Tjernlund Products, Inc. - Tjernlund Residential Capacity Dryer Duct Booster® (LB1, DE160)
 
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Old 11-22-09, 05:22 PM
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Any fan that is in the air stream will get stopped up. 30 feet may not be to long what does the dryer say?
 
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Old 11-22-09, 05:55 PM
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Originally Posted by airman.1994 View Post
Any fan that is in the air stream will get stopped up. 30 feet may not be to long what does the dryer say?
here is a link to my dryer, where can I find what the dryer says?

the perfect finish DV328AEW - Dryers - Washers & Dryers | SAMSUNG
 
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Old 11-22-09, 06:26 PM
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Originally Posted by dinosaur View Post
here is a link to my dryer, where can I find what the dryer says?

the perfect finish DV328AEW - Dryers - Washers & Dryers | SAMSUNG
See the table on page 8 here.
 
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Old 11-22-09, 06:35 PM
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Originally Posted by Michael Thomas View Post
See the table on page 8 here.
I have ridgid 4" with one 90 degree angle. the table says it can go 68 ft.....am I missing something here?
 
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Old 11-22-09, 08:20 PM
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If it can push 68 feet of duct then Id do it.
 
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Old 11-22-09, 09:19 PM
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You didn't umderstand. The dryer vent duct can be up to 68 ft with 1 angle.
 
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Old 11-23-09, 05:14 AM
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Originally Posted by dinosaur View Post
Our brand new dryer still runs way too long.
Could be something other than exhaust venting - have you tried running one load with the exhaust vent disconnected and a window open to see if drying time is improved?
 
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Old 11-23-09, 05:42 AM
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You said your run was at 30 feet that is way less than 69 feet!
 
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Old 11-23-09, 07:01 AM
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Originally Posted by Michael Thomas View Post
Could be something other than exhaust venting - have you tried running one load with the exhaust vent disconnected and a window open to see if drying time is improved?
I did and the drying time did improve.
 
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Old 11-23-09, 03:11 PM
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"We have a dryer vent that runs in our basement and then leading outside of our home 30 ft." --------- I have to ask: no pipe runs are outside, right?

Booster fans are no longer legal on dryers-- M1502.6

Be safe, Gary
 
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Old 11-23-09, 04:48 PM
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Originally Posted by GBR in WA View Post
"We have a dryer vent that runs in our basement and then leading outside of our home 30 ft." --------- I have to ask: no pipe runs are outside, right?

Booster fans are no longer legal on dryers-- M1502.6

Be safe, Gary
no pipe runs outside correct. So you are saying in Milwaukee, WI booster fans are no longer legal? Where did you get that info?
 
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Old 11-23-09, 08:41 PM
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Is the duct clean? It should be cleaned every year.
 
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Old 11-23-09, 09:08 PM
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Originally Posted by airman.1994 View Post
Is the duct clean? It should be cleaned every year.
Yes i have one of those brushes that attach to a cordless drill ans goes deep inside. Works great.
 
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Old 11-24-09, 04:33 AM
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Originally Posted by GBR in WA View Post
Booster fans are no longer legal on dryers-- M1502.6Be safe, Gary
Gary,

Does the change prohibit the use of booster fans (for example to improve the performance of an otherwise compliant system), or just remove the exception allowing their use to extend the length of exhaust lines?

------------

BTW, re booster fans, see the video at:

Tjernlund Retail Store—Dryer Duct Booster (Model LB1), 5 Year No-Clog Guarantee

I can't vouch for the test, but it did make me question the design of the Fan-Tech product.
 
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Old 11-24-09, 08:02 AM
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Isn't the real problem the stupidity of the architect who originally designed the location of the laundry room? Logically houldn't all laundry rooms be located on an outside wall?
 
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Old 11-24-09, 05:53 PM
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A contractor came over today and told me to install a metal filtration box downstaira. place a dehumidifier down there in the summer time. Since we're in WI our winters are cold.

S&P Accessories - Metal Filtration Box For Excessive Dust Environments by S&P | kitchensource.com

HVACQuick - S&P MFL Filter Boxes

this is my best bet. re-routing the duct venting means I still have 15 ft of vent. booster fan with a 30 ft vent duct won't help.
 
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Old 11-24-09, 06:21 PM
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Old 11-24-09, 09:28 PM
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In no way should you use one of these! This will blow all kinds of dust in your home. Plus you will have so much RH do dill with. This contractor that told you this must be a jack leg.
 
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Old 11-24-09, 09:49 PM
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Originally Posted by airman.1994 View Post
In no way should you use one of these! This will blow all kinds of dust in your home. Plus you will have so much RH do dill with. This contractor that told you this must be a jack leg.
he has 25 yrs experience he says. is there any type of filter that can withstand the air/moisture from the dryer?
 
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Old 11-24-09, 11:27 PM
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Sorry I didn't quote my County- not to be used for longer length:

M1502.6 Duct Length- Maximum length of a clothes dryer exhaust duct is
limited to 25 ft
• No longer an exception allowing booster fans to be installed for longer
lengths
• New exception: Where large radius 45 degree and 90 degree bends are
installed, determination of the equivalent length of clothes dryer exhaust
duct for each bend is permitted (in accordance with ASHRAE engineering
standards) From: page #11-- http://www.co.pierce.wa.us/xml/servi...bulletin51.pdf

Now this is interesting: gas or electric length, page 2 in the new code: http://www.dpis.com/News/2008_11.pdf

Be safe, Gary
 
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Old 11-25-09, 01:11 AM
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he has 25 yrs experience he says. is there any type of filter that can withstand the air/moisture from the dryer?
Remember, there is a difference between 25 years of experience and one year of experience 25 times over.
 
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Old 11-25-09, 05:51 AM
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Its not the moisture its the dust. To filter the dust you will have to have a very good filter which would kill the dryer fan.
 
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Old 11-25-09, 08:16 AM
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Have you considered moving the dryer? Obviously if you can't reasonably vent it it is in the wrong place.
 
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Old 11-25-09, 05:07 PM
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Originally Posted by dinosaur View Post
The instructions for every electric dryer I've seen (except for condensing units) includes the following:

 
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Old 11-25-09, 07:38 PM
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The city building inspector and an master hvac contractor who also does furnaces told us that with all of the bends we have close to 100 feet of dryer vent ducting. WOW

Here is what they told me.

"We can get your dryer problem resolved by shortening the run and increasing the pipe from a 4” to a 6”. The new dryer vent would be by the bush next to your air conditioning unit. The total cost would be $334."

Is this cost reasonable?
 
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Old 11-25-09, 09:49 PM
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I just spoke to the guy who installed our radon mitigation system in our home and here is what he says. He still thinks a booster fan is the way to go.


Ok.... the fans I use daily are about the same specs as the ones advertised, so... I'll connect one of our fans on the outside of your house for a couple weeks. You'll have to plug it in when you run your drier, but it will simulate having one of these fans on the end of your current ducting. I can produce about 75 CFM using 3" pipe... about 95 CFM using 4" which you have.

My bet is that using one of these fans cuts the dry time by 2/3'ds and your temp to low, which helps the clothes "life". If it works, you can call these guys and tell them they're full of crap. If it doesn't, you can tell me the same thing. My bet is I win if it's even close to the 2600 radon systems we have running right now.

The question to me is how "open" the drier is to allow me to pull air... but I don't think that will be an issue if I can achieve what they've designed in maximum flow.... which will maximize energy efficiency. The cost comes in sucking conditioned air out of the house, but that's the way any drier's designed. The alternative is hanging your clothes out in the yard.
 
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Old 11-26-09, 07:34 AM
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Originally Posted by dinosaur View Post
The new dryer vent would be by the bush next to your air conditioning unit....
Make sure it's not blowing dryer lint onto the condensing units coil...
 
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Old 11-26-09, 07:52 AM
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Originally Posted by Michael Thomas View Post
Make sure it's not blowing dryer lint onto the condensing units coil...

correct, it is far enough and it's going to positioned in a way that it will blow the lint, if any, far from the unit.

plus there is a huge rose bush between the unit and where the exhaust duct will be.
 
 

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