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A gas furnace uses a draft hood and relies on natural draft to move flue gases up the vent. This describes which general appliance venting category?
a.A direct-vent sealed-combustion appliance
b.A power-vented appliance requiring PVC
c.A Category I appliance with a draft hood venting by natural draft
d.An unvented decorative appliance
Giải thích
An appliance with a draft hood that vents by natural draft and produces non-condensing, low-pressure flue gases is generally a Category I appliance, typically vented with Type B vent or a lined masonry chimney. Direct-vent and power-vent appliances use sealed or mechanically assisted venting and different materials. Matching the vent to the appliance category is essential for safe combustion product removal.
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