International Association of Certified Home Inspectors
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| HVAC Topics include heating, venting, and air conditioning. |
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#1
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Please Note:
ehyde is a non-member guest and is in no way affiliated with InterNACHI or its members.
Hello, I was curious, since I could not find reference to this situation in any of my training manuals, as to whether or not a gas furnace and water heater can share the same exhaust vent?
Any help would be greatly appreciated, thanks in advance. |
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#2
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The main vent must be the size of the largest appliance vent, plus 50% of the second.
You can not put a forced vent appliance with a natural convection water heater flue. It may back draft at the air break. |
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#3
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The main vent can be the actual vent for the largest appliance (BTU-wise) as long as it is also 50% larger than the second vent beginning at the point where they connect, as shown here.
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