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Country Discussion Topics
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6 duct fan question-
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Mike D.    Posted 01-13-2004 at 05:24:44       [Reply]  [No Email]
Do any of you use an in-duct booster fan to help move air? ALSO- can you use a dimmer switch to control fan speed on these fans?

Our bathroom was added to our house after the area got electricity in the early 50's. There is a 6" duct that runs out to it and feeds up through a register in the floor. We heat with a woodstove that has a plenum (Englander) and the bathroom is the last room to get warm, or stay warm. It has insulation in the crawl space, and attic, and a good storm window. It faces North.

Leo from IA    Posted 01-13-2004 at 09:02:08       [Reply]  [Send Email]
Don't forget to provide a place for return air to get back
to the systems, it helps a lot.

Lazy Al    Posted 01-13-2004 at 08:17:32       [Reply]  [No Email]
I put one in a 6" line going to a glassed in porch. It's on all the time just to keep the flowers from freezing out there but like down below it's noisey . and they seem not to last long. might try a bigger duct or more direct flow . every corner slows flow down alot .

Ron from IL    Posted 01-13-2004 at 07:10:16       [Reply]  [No Email]

Are all of your ducts round? If so, you can add "butterfly" dampers in them to balance the air and add pressure to the duct which needs more. I did this to my house. Some rooms, being closer to the heat source, need less pressure to heat the room. You can close the damper more to these rooms and gain more duct pressure.

Good luck!


Reostat    Posted 01-13-2004 at 06:51:32       [Reply]  [No Email]
A booster may or may not help. More than likely the reason that it gets next to no heat is because of the way the duct is run. You have to use a variable speed motor controller for a motor (looks just like a dimmer). I would check to see how the 6" duct is hooked to the main trunk, you may just be able to move it to a better location on main trunk where the air blows into it more directly. Or you may be able to put an "angle" takeoff where the 6" hooks to the main trunk to let the air flow more freely into it. If you install a booster fan, you will have to run it, if you don't then you will get even less air because of the fan obstructing the pipe. Booster fans also tend to accumulate a lot of dust build-up on them in a short period of time. I would check out the layout of the duct system first, it would be a cheaper, permanant fix and have no maintenance.

Colin in WI    Posted 01-13-2004 at 06:39:18       [Reply]  [Send Email]
Similar situation here. 150 year-old house and very little heat gets to one of the bedrooms upstairs. I installed an in-line booster fan in the dedicated run to that room. I put it on a remote-controlled switch (X-10) so that I could turn it on and off as needed. However, the fan creates so much noise that it isn't worth running it. My son would rather freeze than listen to it. If I had to do it again I might do the same thing but isolate the fan unit in sound dampening section of flexible duct.

deadcarp    Posted 01-13-2004 at 06:22:46       [Reply]  [No Email]
if you have a fan that moves too much air but works okay, snap some blades off (in a pattern so it still balances). i did that with my furnace blower, it's a squirrel cage so i eliminated 2/3 of them and it's now about right. :)

TB    Posted 01-13-2004 at 06:12:08       [Reply]  [No Email]
Mike A dimmer switch would burn out. They make a moter speed controlle that looks very simeler. You should be able to get them at your electric supply.

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