Building a cold air return filter box

Building a cold air return filter box

PostBy: szembek On: Wed Aug 13, 2008 5:02 pm

Ok, I have a keystoker A120, and I'm looking to tie this into my cold air return. I can buy a unit that is a box, with a space for a removable filter in it, and a bend up that you would then add ductwork to. It is $90, but I don't think it will fit in the space beneath the motor. It seems like I would be better off making something myself. Another option would be to draw up all my measurements and have the local sheet metal place manufacture the duct work for me. Has anyone done this before? Or have any sources to buy these 'filter boxes' ? Or would it be in my best interest to just call a local heating company and let them build and assemble the stuff. It seems like a pretty small job for them though. Thanks for any input you can provide.

EDIT:
Actually now that I've found images of what I'm thinking of online, it looks too much for me to build myself. I'll just have to find a local place that can sell me the pices I need in the sizes I need.

I do have another question though that maybe somebody can help me answer. I had existing ductwork in the house for my oil furnace. I tied my keystoker into the ductwork by running 8" round pipe from the coal plenum into the oil plenum. There is 8x12 duct that runs up for the cold air return. Should I tie into that cold air return with 8x12 duct, or would it be sufficient to tie into it with 8" round since I'm limiting it to 8" round on the output. There will be a couple of turns to get from one cold air return to the other, so that could be a reason to go with an 8x12 or maybe even larger rectangular duct instead of 8" round. 8" round is considerably cheaper than the 8x12 rect.
szembek
 
Stove/Furnace Make: Keystoker
Stove/Furnace Model: A120

Re: Building a cold air return filter box

PostBy: 4tees On: Thu Aug 14, 2008 7:59 am

I have also been searching for a cold air return plenum with a filter rack installed. Where did you find the one for $90? Anyone else have a source online?

I am going to try to feed from that to the LL Hyfire hot air jacket opening and convection fan inputs. I have seen WNY's feed to the convection fans. Anyone have pics of a slick way to tie into the hot air jacket...or at least feed under the jacket on the sides of the stove?
4tees
 
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: Hyfire II with hot air jacket

Re: Building a cold air return filter box

PostBy: szembek On: Thu Aug 14, 2008 8:25 am

Northrup supply in Binghamton, NY is where I found one. I think any heating/plumbing supply store should have these. The 8x12 duct was $21 for 3 feet though. That can get expensive quick. Maybe I could do the 8x12 up to the ceiling then my horizontal run use 8" round. I wouldn't need to build any adapters then either.
szembek
 
Stove/Furnace Make: Keystoker
Stove/Furnace Model: A120


Re: Building a cold air return filter box

PostBy: stokin-railroad On: Thu Aug 14, 2008 8:32 am

binghamton hardware,eldridge st. they have all kind of sheet metal prod.szembec you will have better results with duct work to cold air return. i dont know about round versus rect.duct but i would think that the least restricted duct would produce better results.
stokin-railroad
 
Stove/Furnace Make: keystoker
Stove/Furnace Model: koker 160k

Re: Building a cold air return filter box

PostBy: szembek On: Thu Aug 14, 2008 9:54 am

Thanks, I'll give them a try.
szembek
 
Stove/Furnace Make: Keystoker
Stove/Furnace Model: A120