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10-17-2007, 01:57 PM #1
10-17-2007, 03:34 PM #2
Re: Combustion Air Vent terminating at Roof Top
If you are talking about a woodburning fireplace, the inlet for a combustion air kit cannot be located higher than the point where it enters the Fp. One exception to this is where a mfr. allows for a vertical application in their listed instructions such as Heatilator. They allow the intake within 3 feet of the termination vertically as long as you form a trap at the base. Since this is a listed application, your AHJ should not fail this type of installation.
The hazard is that if the inlet is located in a negative pressure zone such as the lee of a house, it can actually draw flames out the air intake. Dale has a video of this happening.
Keep the fire in the fireplace.