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Inspecting HVAC Systems Topics include heating, venting, and air conditioning inspections.

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  #1  
Old 12/11/06, 8:07 PM
Kenneth Blair Kenneth Blair is offline
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Default Furnace Exhaust Clearance

Does this insulation need to be clear of the furnace exhaust vent?
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Old 12/11/06, 10:00 PM
Charley L. Bottger's Avatar
Charley L. Bottger Charley L. Bottger is offline
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Default Re: Furnace Exhaust Clearance

Quote:
Originally Posted by kblair1
Does this insulation need to be clear of the furnace exhaust vent?
In this state double or single wall pipe must be at least 4 inches from combustible.
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Old 12/11/06, 11:16 PM
ccbrands1 ccbrands1 is offline
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Default Re: Furnace Exhaust Clearance

i believe the standards are 1" clearance for B vent and 6" for single wall vent.

of course, as Charley pointed out, state or local requirements may reign supreme.
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Old 12/22/06, 2:32 AM
Jeremy Tucker Jeremy Tucker is offline
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Default Re: Furnace Exhaust Clearance

CC has it right for the minimum clearance from combustables. 1" for B vent, 6" for C vent (single wall), BUT... the clearance for single wall CAN be reduced to 1" if a heat shield (sheet metal) is installed between the vent and the combustable surface. But to be sure, check local regulations.
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