OT- forced hot air ductwork

Bret4207

Well-known Member
OT , I know, but one of you will know what I need. I need an elbow sort of device to insert into a hot air floor duct that will exit under a dishwasher. I can remove the front bottom panel of the DW, but I need to "curve" the air so it exits out at 90 degrees instead of blowing up onto the DW base. No, we can't move the duct work or outlet. We have a plastic device my wife got out of a catalog but it's cheap, cheap, cheap and I doubt it will handle the heat out of a wood furnace any too good. Something metal must be available to do this, but I don't know what to look for. Thanks in advance!
 
Had a similar situation and after checking a couple local hardware stores with no success, I just made one out of sheet metal (chimney flashing) I had lying around. Bent it up to fit, screwed it together with self-drilling screws through a couple tabs I'd added for the purpose, set it in place and sealed the edges with foil tape. 10-minute job, no out-of-pocket expense, and it's held fine for several years now. I'm sure they make purpose-built ones, but all they're going to be is bent sheet metal anyway, so I just did it myself.
 
Bret, if I understand you correctly you need a
flexible elbow, the black one is from my wood stove
and it's 8" , but the flex part is rusted now, the last
one is a 8" also and you can see how it's turned and
not an elbow right now, I use it on my lawn mower
vacume system, you can get all different size ones
at any hardware store or HVAC company.
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I beleave what you are looking for is called an "air deflector for hot air floor register." I found lots of
them on line, but they are all plastic. Maybe you could line a plastic one with tin foil, making a sort of
heat shield?
 
You arent going to have too much heat out of your wood burner to ruin plastic or you would burn the house down your temp would be probably 200 or so deg.
 
So, this must be on the non combustion side of the heat exchanger, air handler and or fan moving the heated air to the main trunk, then branches. You want to transition through the floor, under the dishwasher, then terminate at the face of it ?

Showcrop nailed it, theres a bunch of low profile HVAC duct, and or any competent HVAC shop that makes their own duct from sheet metal would be able to make a custom piece if you need it. Probably don't need smoke pipe gauge, you'll find something or have it made that will work, just match up the CFM's as best you can with how you size it, neither restrict or increase air flow, all those types of systems do need to have the air flow balanced.
Low Profile Duct Fittings
 

Thanks guys, I've got a good idea what to look for. The air temp out of the duct work can run upwards of 150 F at times and the plastic device we have already shows the stress. Metal is my preference.
 
I think what you are looking for is called wall stack. It is either 2 1/4" or 3 1/4" deep and anywhere from 10" to 14" wide. Most home centers,
Home Depot or Lowes , etc would have it.
 
If you can't find anything off the shelf that works for you, any tin knocker should be able to fab something up for a sawbuck.
 

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