How much space between furnace and walls?

DangerMouse

Is there code on this? I imagine there is... Po)

Thanks guys!

DM

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yuri

Is it gas or electric unit? The rating plate will have the specs for clearances to combustibles or the install manual which may be online.

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Rusty999

Yuri has it right. The unit should be marked with "clearance to combustible surface" information. Generally oil furnaces have a larger clearance requirement. Special units like some 90% and higher gas units and mobile home furnaces may be rated for 0 clearance, meaning it can be installed with full contact. Clearance requirements may also come into play with the type of floor its on as well, requiring a non-combustible base kit. Check the plate and the manual. Don't take chances.

DangerMouse

It's a mobile home unit that HAD about a 2" gap around it. I was thinking if I ever get a larger unit, I may want more space in the hole as well?

Thanks

DM

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yuri

Check out the Nordyne/Miller/Intertherm site. They make a lot of mobile home units, cornered the market where I am. You don't want to lose clearances for fire insurance reasons.

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DangerMouse

Well, it was installed by a company so I imagine the 2" was OK then? I was thinking more like 3", so I should be safe enough. My concern is the size of the newer units. Will they fit in the same area if/when I get a higher eff. rated one? It's being reinstalled on 3/4" ply floor over 2x12s, centered on 16". The flange I removed will slide nicely between the joists, but I'll need a plenum to attach the steel ductwork I'm using to, below the level of the joists..
....and dampers, and register vents, and elbows, etc...
DM

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yuri

W/O knowing the model and manuf. specs we cannot answer that. Beware that mobile homes have skinny undersized ductwork so you may need to upsize it for a bigger unit. Try Nordyne and see if they have online install specs for those units.

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DangerMouse

This thing kicks out some major heat, and I'm using 6" round ducts traveling only a bit farther than the flat ones were.
The inspector said it matters not, as long as it can maintain 68° at 3' from the floor. It's a 62,000 btu Nordyne direct vent/forced air unit.

DM

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DangerMouse

propane

DM

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