duct work???

Where does the duct go to? Make sure you have at least 2" of clearance between the duct and any combustible (wood framing), I'd double that number if it were me.

TS

Yeah, that single duct looks WAY too small! Or need several more of them.
Yeah some (most) HO ins co's are just looking for a way of getting out of covering wood stoves furnaces!

nate p. said:

I thought so myself I was debating on adding one more on... it is a six inch duct coming out of the top now

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My wood furnace has a 16" round off of the top feeding back into my propane furnace. That setup is way too small.

I think the smallest I have seen is (2) 8" ducts. Depending on the BTU rating of the furnace, it may need a good bit more than that. (1) 6" is definitely not enough

jrod770 said:

My wood furnace has a 16" round off of the top feeding back into my propane furnace. That setup is way too small.

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My Yukon has 24x24 plenum, (2) 8x24 ducts coming of that. That will flow a lot of air! Your 16" round is almost 200 sq in., his single 6" is only 27! fire hazard city!

Get an add on furnace and put it in the furnace rm. No good can come from the current setup.

He's using it as an add-on, no?
My old Hot Blast had 2 8" ducts so you'd not be getting much out of that furnace, imo.
Since the top is just open for attachment to your existing system as needed, I would suspect brenndatomu is right about the insurance co. trying to get out of the policy. My insurance agent told me I could run the add-on as long as I maintaned the propane furnace in place. Their policy didn't permit stand alone wood heat. Not sure what they found dangerous about that. I was only to use it "part time", as well. lol...right! If my house were to burn down, exactly how do they suppose we would determine which burn cycle I was on for my part time permission?

What's the return setup? And ya, that's way small supply.

I'm already over my head since I have no direct experience with hot air systems, so this'll likely be my last post - but you also need to be very careful about negative drafting & your return pulling bad stuff out of your firebox & into your ductwork.

+1 on that

brenndatomu said:

Yeah some (most) HO ins co's are just looking for a way of getting out of covering wood stoves furnaces!

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I agree. That doesn't really change anything. Insurance company definitely looking to get outta policy

nate p. said:

Well it had the single 12" round duct hook up so would two 6" be good? Because furnaces at menards of a similar size out of the two they had there one had a single 12" hole out the top and one had two 6"

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Do the math, (1) 12" is around 108 sq in. (2) 6" is only 54 sq inches! Also, you have to compare actual BTU rating, firebox size, and CFM of the duct blower, the Menards furnace with (2) 6" holes likely was a lot smaller furnace

Even so, I'm sure that (2) 8" round ducts are gonna be MINIMUM.
Probably gonna be tough to get anyone to insure that furnace, they get REAL gun shy of old stuff. Most will want MFGs recommended install info (and UL or Warlock Hershey certs) to certify that you installed it right, especially as a new customer. Sounds like that info is non existent. Likely part of the reason it was so cheap. What brand/model/age is it anyway?

What is the make & model?

And this is more seat of the pants than anything - but looking at that pic, with the way the duct immediately goes down, that looks like a heat trap that could cause some very serious grief if there were a power outage or blower malfunction while there was a wood fire burning.

maple1 said:

What is the make & model?

And this is more seat of the pants than anything - but looking at that pic, with the way the duct immediately goes down, that looks like a heat trap that could cause some very serious grief if there were a power outage or blower malfunction while there was a wood fire burning.

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Oh yeah, I see it now! I thought that the duct just went to the right through the wall, I didn't see the second ninety and the downhill run through the back wall. They would consider that a downdraft install. Yup, no insurance co. will take that, heck, the don't even let you do downdraft fossil fuel furnaces unless it is made/certified that way. Darn shame too, cause your new "plenum" ductwork shur is purty!