OT: HVAC Help?

Money Pit · Sep 12, 2014

posted some time ago about heat for my garage. looking into a used Hi Efficiency furnace; lot simpler to vent than poking a hole in the roof. unit is already configured to propane which is my fuel source. so short version would be ge it into location - with the minimum required clearnaces - hook up propane. test for leaks. hook up electric. hook up thermostat. run pvc for exhaust and intake air. of course exhaust as straight and short as possible. some simple ductwork on the top to diect hot air effectively.

sound reasonable? or am i oversimplifying this? as always input is appreciated. thanks.

pikewi · Sep 12, 2014

Drain for the unit?

pikewi · Sep 12, 2014

cold air return?

Money Pit · Sep 12, 2014

both good points. figured on a simple filter set up on the cold air return. and want to duct the warm air to a location away from the furnace so i get a decent flow. drain i missed mentioning; of course it would be needed.

also; yes the furnace will be in the heated portion of the garage. guesing if i run the duct work above the ceiling i'll have to insulate it pretty good.

John,PA · Sep 12, 2014

Good ideas.

There are a lotta of free standing furnaces in garages/workshops.

I would simply put the return air opening at the floor level. 16x20 in. filter with a case of filters on hand.

The hot air coming through a curved plenum at the top. Sometimes fellas put a grill on to direct the warm air over the work bench area.

NOTE: When using some cleaning solvents and paints. The vapors from the chemicals can become toxic when passing over a hot surface. SLOW DEATH!

HTH John,PA

Jerry9N · Sep 12, 2014

Any source of ignition installed in a garage area needs to be elevated 18 inches above the floor. This would be the burner height inside the unit. You shouldn't draw your return right off of the floor for the same reason, build up of gasoline vapors at floor level. The building code specifies 18" because most garages are opened and closed enough, and cars and trucks don't hold enough fuel to collect vapors up that high. If there is a straight line to the unit where vehicles enter you also need bollards set in the concrete floor to prevent damage to the unit.
Jerry

KrisNMo · Sep 12, 2014

Simpler would be an electric furnace, no vent and no drain needed. I picked up a 25k electric Trane furnace with the A coil installed a couple years ago on Craigslist for $200. The furnace was only 8 years old when I bought it.

OT: HVAC Help?

Money Pit

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pikewi

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Money Pit

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