Type 1 clothes dryers can be installed in closets in bedroom or bath only when what is true?

• A. The exhaust is vented to outdoors
• B. Combustion and ventilation air is introduced to space with an intake equal to or greater than exhaust and space correctly sized
• C. Dryer must be electric
• D. Closet must have a vent fan

Answer: (B)

Gas-fired dryers in closets must have a sufficient supply of air for combustion and for venting their products. In a confined space like a closet, the intake of combustion and ventilation air has to be introduced in an amount that is equal to or greater than the exhaust leaving the space, and the closet must be sized to accommodate that air flow. This balance prevents negative pressure, which can cause backdrafting, incomplete combustion, or carbon monoxide buildup, ensuring safe operation and proper venting. Simply venting the exhaust outdoors is not enough if the space doesn’t receive enough air; requiring an electric dryer or adding a vent fan is not the condition specified for this installation.