When inspecting a high-efficiency condensing furnace, the inspector finds the PVC vent pipe is not supported and sags between connection points. Why is this a defect?
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A
PVC pipe must be replaced with metal for all furnace applications
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B
Sagging can allow condensate to pool and block flue gas flow
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C
The pipe diameter is likely incorrect for the furnace BTU rating
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D
Condensing furnaces do not require venting