exhaust vent pipe

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  #1  
Old 03-04-08, 08:25 AM
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exhaust vent pipe

i have a coleman mobile home furnace it has two pipes for exhaust why does it need both
 
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Old 03-04-08, 08:46 AM
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One of the pipes brings in fresh air that is needed for proper combustion (fuel+air are needed for a good/healthy flame)

the other pipe carries the byproducts of combustion to the outdoors (the hot combustion gases)
 
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Old 03-04-08, 10:08 AM
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can u use plain pipe or do have to use double wall pipe
 
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Old 03-04-08, 11:24 AM
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The only right answer to that question lies on the unit's installation manual. The manufacturer determines what is appropriate and safe for a particular unit.

The installation manual should be by the unit. Take a peek at it.

Having said all of the above, and without the following comment being an endorsement, heating furnaces/boilers what have two vent pipes are typically 90+% in efficiency and the temperature of their combustion gases is quite low. Double-wall pipe is typically not required. As a matter of fact, the manufacturer may even recommend plastic pipe and direct vent to the outdoors (not the chimney).
Again, your manual will tell.
 
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