When a draft hood is used it shall be installed

• A. With alteration
• B. In attic
• C. Without alteration
• D. Upside down

Answer: (C)

Draft hoods are designed to vent combustion products and balance the air needed for safe operation. They must be installed as designed, without alteration, so the openings and relief path remain in their intended sizes and orientation. Any modification—changing the opening size, removing parts, bending, or otherwise altering the hood—can disrupt the air flow and the ability of the vent to relieve pressure, increasing the risk of backdraft or spillage of combustion gases into the living space. Therefore, the correct practice is to install the draft hood without alteration and in accordance with the appliance’s manufacturer instructions.