A draft hood for a duct furnace shall be located ______.

A draft hood for a duct furnace shall be located ______.

• A. in an accessible location on the venting system
• B. in the same enclosure from which the combustion air is taken
• C. on the appliance casing
• D. within the ductwork

Answer: (B)

Draft hood placement is about ensuring the venting pressure environment matches the combustion air environment. The draft hood must be located in the same enclosure from which the combustion air is taken so that the pressure acting on the flue gases is the same as the pressure around the appliance’s combustion process. This keeps the venting system stable, helps prevent backdrafting, and ensures safe, effective removal of combustion products. If the draft hood were placed somewhere else—on the venting system, on the appliance casing, or inside the ductwork—the hood would not share the same pressure conditions as the combustion area, increasing the risk of improper venting or backdraft.

Draft hood placement is about ensuring the venting pressure environment matches the combustion air environment. The draft hood must be located in the same enclosure from which the combustion air is taken so that the pressure acting on the flue gases is the same as the pressure around the appliance’s combustion process. This keeps the venting system stable, helps prevent backdrafting, and ensures safe, effective removal of combustion products. If the draft hood were placed somewhere else—on the venting system, on the appliance casing, or inside the ductwork—the hood would not share the same pressure conditions as the combustion area, increasing the risk of improper venting or backdraft.