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Old 12-16-2008, 04:29 PM   #1
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trailer furnace on blocks in garage


I'm putting a trailer furnace,miller mod 80,in the garage.I want to use a block foundation to lift it up and vent it to the floor,do I need to close off the bottom of the furnace at the motor?Common sense tells me I should and cut some vents in the front of the body to vent the motor.Also,is it required to have a dampner,or vent the exhaust straight out ok??Does the length of the exhaust vent matter?? Thanx folks.

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Old 12-16-2008, 06:12 PM   #2
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trailer furnace on blocks in garage


Use to use hollow cement blocks to do what your doing.
Unless it was not desirable to have teh air blowing out all 4 directions.

Make sure you have it high enough that the burner motor is 18" above the floor.

Yes, block off the bottom combustion air inlet, and cut a hole on the side of the jacket. Put a mesh screen over it.

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Old 12-16-2008, 10:07 PM   #3
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trailer furnace on blocks in garage


Thanks buddy,I appreciate the comeback on the trlr furnace/garage/blocks,does the motor have to be 18" off the ground?Im limited on height,how about the ex vent,do I need a dampner?Can the ex vent go straight up or curve 90 out 90 up?I dont know if I need a dampner/flue whatever that vent/flap thingamajingy is technically called
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Old 12-17-2008, 04:34 AM   #4
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trailer furnace on blocks in garage


Code for garage requires all sources of ignition to be a min of 18" above the floor.
Since a motor can spark, it is a source of ignition.

You should have no trouble if you ell over and then ell up.
Providing its not too far over.
You will want a barometric damper.
It will work without one, but a damper will help keep the flame lower in the combustion chamber, and burn a little cleaner.
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Old 12-17-2008, 06:18 AM   #5
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trailer furnace on blocks in garage


hey been there,18" it is,ells and dampner,thanx buddy!
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