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Thread: Wood stove from Old furnace heat exchanger

  1. #1
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    Wood stove from Old furnace heat exchanger

    Wood stove from Old furnace heat exchanger is back drafting even with a induced blower motor.

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  3. #2
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    Where is the make up air coming from?

    Even though my house was built in the fifties, apparently it is very tight. Because if I don't crack a window, the flue won't exhaust properly.

  4. #3
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    That there is some custom work.
    UA Local 32 retired as of Jan 2020

  5. #4
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    It's got louvers in the top part of the *garage* and my brother installed a joist mounted 1/2 hp blower motor for when he welds (arc weldee and mig welder).

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  6. #5
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    All of it is custom from an old oil to gas conversion furnace we removed at work and I think it could be better then the harbor freight wood stove to heat the garage

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  7. #6
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    I wouldn't think you'd need the induced draft motor. Don't like the way it's plumbed in either. I'd just cut a little hole in the side instead of using that wye. It's like the air would slow down too much before entering the main flue, then not know which direction to go.

    Plus, introducing all of that 'cold' air would not allow the flue to get hot and create it's own draft.

    Does it work once it gets hot? Without that induced blower motor?

    I'm guessing you'd need to build a small fire first to heat everything up. Probably not enough draw with a cold flue in the beginning.


    Quote Originally Posted by jrath66 View Post
    All of it is custom from an old oil to gas conversion furnace we removed at work and I think it could be better then the harbor freight wood stove to heat the garage

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  8. #7
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    what is the measured draft? why the need for induced draft? could a cap have increased draft? just an experiment?

  9. #8
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    You'd be better served using something like this....

    http://www.grainger.com/product/TJER...AS01?$smthumb$

    The way it is there, you're pumping fresh air into the flue. Causing the flue temp to drop.

    Just my 2cents.....

    Chase


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  10. #9
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    Not sure what is the point of that draft inducer. Looks like its blasting cold air into the flue.

    Also none of your venting materials are suitable for solid fuels.

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  12. #10
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  13. #11
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    I'd recommend not running this thing.

    If that 1\2 hp exhaust is running, you'll never be able to get it to draft unless you have some relief air coming in. A lot of relief air.

    The way it is currently set up is a disaster waiting to happen. If you have a fire in that box, you'll be feeding it with air with that "inducer" motor if the vent pipe gets even a little plugged. That fire will spread like crazy and anyone inside works be lucky to escape.

    This is a bad idea. Really bad. There's a good chance someone will die if you run this contraption.

    Please don't. You're not an engineer and definitely don't have appropriate safety measures in place for what you are trying to do.

    Again, please do not operate this.

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  15. #12
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    What I mean by the fire spreading is that it will blow out of the bottom around the "door" and into the garage...

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  16. #13
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    Thanks for precautionary disposition. The new idea is covert the flue to a undefined size 28 gauge ,and attach the flue fan to the size. Then re attach the fan to the T again. We have two 8x12 louvers on the garage for make up air.

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  17. #14
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  18. #15
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    I don't inderstand all this crazy engineering with mechanical draft. why not just run some sort of chimney first? then you can start adding or modifying caps. chimney caps can do wonders for draft issues.

  19. #16
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    well there you go, someone put the chimney in upside down!!

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  21. #17
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    I highly doubt two 8x12 louvers is enough make up for that 1/2 hp welding exhaust fan, unless there's almost 0 pitch on the blades.

    That's even assuming that the bug screen is offering 0 resistance.

    Again, you're building a death trap. You're going to burn your home down if not worse. Please stop now.

    There aren't the needed safety devices on a homemade wood burner to attach a fan to the flue.

    This is a really bad idea.

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  23. #18
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    Is that gable vent even connected to the space? That's an attic vent, not make up air.

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  24. #19
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    Thanks for the input I will get another stove. I WON'T burn the garage down. We do have 2 full size approved fire extinguishers in the case there is a fire.

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  25. #20
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    I used to burn wood in my garage/shop. Then I had a small fire when the fire got to much draft and heated the stove pipe enough to set the roof on fire. There was at least 6 inches from the double wall pipe to combustible. I heat with electric now safer with paint and gas fumes. Nice just to use a thermostat also.

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