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Thread: My outside hot air furnace project

  1. 11-18-2010, 03:09 AM #1
    dave_dj1
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    My outside hot air furnace project

    I had this Fawcette hot air wood furnace given to me last summer, I don't realy have room in my garage for it so I decided to make due, and put it outside.

    The silver stuff is called Reflectex, it has a class 1-A fire rating so I figured it would be a good barrier to prevent thermal transfer from the siding to the furnace.
    First thing I did was to build and insulated base, 2" high R sheathing sandwich'ed betweeen 2 layers of 5/8 plywood, covered by a piece of dura-rok. Keep in mind that most of the stuff I used I had lying around except the steel studs and the reflectex and stove pipe.



    my brother had just taken down a tripple wall chimney, 10" inside and 15" outsied, I made some pieces to cover the ends and filled in between with vermiculite for insulation, these are my hot/cold air lines to the garage.


    my brother also had this piece of ductwork,

    I've had this blower for years, not knowing what I needed it for..lol

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  2. 11-18-2010, 03:14 AM #2
    dave_dj1
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    after I framed it with 3 5/8" steel studs, I insulated it with R13 fiberglass insulation, then another layer of the reflectex.


    It has a 7" stack, I put a 10" over it and filled with vermiculite, trying to keep the chimney warm, the top part is reduced to 8" over the 7", air insulated.
    I am using it now, it works great after installing a new fan limit switch.
    I have a couple of finishing touches to do , I will post a few more pics as soon as I get her finished up.
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  3. 11-18-2010, 03:50 AM #3
    Beefie
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    Neat project, it will be interesting to see how it works over the winter. If you have more pics post them up we like pics here lots of pics


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  4. 11-18-2010, 03:50 AM #4
    beerman6
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    Just a home owner wanting to learn
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  5. 11-18-2010, 04:52 AM #5
    Jredsjeep
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    nice! thanks for sharing, look forward to seeing it work!
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  6. 11-18-2010, 04:58 AM #6
    grapplermi
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    That looks really cool, should work nice. Good job.
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  7. 11-18-2010, 06:03 AM #7
    Del_
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    I love your enthusiasm but I've got a one word solution for heating with wood around here: Jotul.

    No wires...no fans...no ducts...higher efficiency......no heat lost to the outdoors......great fire view.....3 days fuel supply sitting on the hearth...etc.

    /




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  8. 11-18-2010, 12:09 PM #8
    iowa
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    Quote Originally Posted by TreeCo View Post
    I love your enthusiasm but I've got a one word solution for heating with wood around here: Jotul.

    No wires...no fans...no ducts...higher efficiency......no heat lost to the outdoors......great fire view.....3 days fuel supply sitting on the hearth...etc.

    Sooooo. Is this a stove. I can load my furnace and not worry about it for 12 hrs. House is still 76 deg. This is on a 3000 sq ft house. How many times would u have to load a jotul?
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  9. 11-18-2010, 12:13 PM #9
    pook
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    watch for embers from the chimni landing on the shigle roof?
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  10. 11-18-2010, 03:04 PM #10
    flotek
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    do i have this right? looks like your using thin ducting for a chimney pipe but using the triple wall for your ductwork ? sounds kind of backwards
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  11. 11-18-2010, 03:15 PM #11
    dave_dj1
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    Quote Originally Posted by flotek View Post
    do i have this right? looks like your using thin ducting for a chimney pipe but using the triple wall for your ductwork ? sounds kind of backwards
    the chimney pipe is 7" heavy stove pipe, with a 10" stove pipe over it and vermiculite in between. My thought was to keep the smoke warm to the top to avoid any creosote. If I have to replace the pipe in a year or so it's no big deal, I may stumble across some metal-bestos pipe.
    As far as embers on the shingle roof, It has crossed my mind, the furnace has a huge heat chamber that the smoke goes through before going out the chimney so the risk is minimal and, the whole thing is actualy big for my little garage so I have only been putting small amounts of seasoned hardwood in it at a time, maybe 2 sticks, I've been using it since last Sunday. I only light it when I'm going to be in there, I never have it going when I'm done unless it's just a few coals. So far it works awesome!!
    I will post up some more pics this weekend, been swamped with work so I haven't put the finishing touches on it yet.

    As far as using a jotul, I have NO room in the garage! Or do I want the sparks, i weld and paint and fab parts for my trucks, jeep or buggy. I need all the room I can get.

    Here's a link to my latest welding project.
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  12. 11-18-2010, 09:56 PM #12
    scotvl
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    Quote Originally Posted by TreeCo View Post
    I love your enthusiasm but I've got a one word solution for heating with wood around here: Jotul.

    No wires...no fans...no ducts...higher efficiency......no heat lost to the outdoors......great fire view.....3 days fuel supply sitting on the hearth...etc.

    where I live my insurance co made me remove my wood stove in the garage (they said you cannot have a wood fired heater anywhere fuel may be stored) I wonder if this would be ok?
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  13. 11-18-2010, 10:10 PM #13
    Justsaws
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    Quote Originally Posted by scotvl View Post
    where I live my insurance co made me remove my wood stove in the garage (they said you cannot have a wood fired heater anywhere fuel may be stored) I wonder if this would be ok?
    It is not where I live. No property/fire/liability insurance on home made or non-UL/etc. heating devices.

    No (inexpensive)insurance on out buildings with wood burners installed in them. Specific policy addition with limitations for residential applications. Do not know about farms/business.

    Most folks that installed the out door wood boilers that I have talked to did not even ask their insurance company about coverage. When I asked the answer was "NO" or "Yes, but ..." which equaled more $$$.
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  14. 11-26-2010, 05:20 AM #14
    dave_dj1
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    well it was finally cold enough here (low 20's) yesterday to see how the unit performs, all I can say is AWESOME!

    I have a couple of pieces of siding to put on and I will get some more pics up.
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  15. 11-26-2010, 05:40 AM #15
    scag52
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    Very nice . I like the whole idea . No water to worry about. I had a stove in my shop and always thinking about those fumes exploding.
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