Building a Cold Air Return Filter Box

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szembek
Member
Posts: 105
Joined: Tue. May. 08, 2007 2:32 pm
Stove/Furnace Make: Keystoker
Stove/Furnace Model: A120
Location: Upstate, NY

Post 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.

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4tees
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Posts: 65
Joined: Tue. Jun. 24, 2008 8:53 pm
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: Hyfire II with hot air jacket
Location: Lehigh Valley

Post 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?

szembek
Member
Posts: 105
Joined: Tue. May. 08, 2007 2:32 pm
Stove/Furnace Make: Keystoker
Stove/Furnace Model: A120
Location: Upstate, NY

Post 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.


stokin-railroad
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Posts: 115
Joined: Sun. May. 18, 2008 2:53 pm
Stove/Furnace Make: keystoker
Stove/Furnace Model: koker 160k
Location: NY./PA.border I 81

Post 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 don't know about round versus rect.duct but I would think that the least restricted duct would produce better results.

szembek
Member
Posts: 105
Joined: Tue. May. 08, 2007 2:32 pm
Stove/Furnace Make: Keystoker
Stove/Furnace Model: A120
Location: Upstate, NY

Post Thu. Aug. 14, 2008 9:54 am

Thanks, I'll give them a try.

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