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The minimum horizontal vent length is 3'.
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If possible, do not terminate the horizontal vent through a
wall that is exposed to prevailing wind. Exposure to excessive
winds can
affect unit performance.
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Vent termination must be free from obstructions and at least
12" above ground level and maximum snow height.
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Do not terminate vent directly below roof eaves or above a
walkway, or any other area where condensate dripping may be
troublesome and
may cause some staining. Avoid windows where steam may cause fogging or
ice buildup.
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When horizontally vented, minimum clearance for termination
from any door, window, gravity air inlet, gas or electric meter,
regulators,
and relief equipment is 4'. In Canada, termination is 6'.
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Vent termination must be a minimum of 4' below or 4
horizontally from any soffit vent of under-eave on a Mr.Heater or 3' on a
Reznor.
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Vent must be a minimum of 6' from an inside corner formed by 2
exterior walls. If possible, leave a 10' clearance.
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Vent termination must be a minimum of 10' from any forced air
inlet (includes fresh air inlet to other appliances, such as a dryer)
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When termination is routed through an exterior combustible
wall the vent must be supported using a listed clearance thimble.
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For horizontal venting, the vent pipe shall be supported with
hangers no more the 3' apart to prevent movement after installation.
