In a closet designed for the installation of a clothes dryer, what should be the minimum opening size for makeup air?

The minimum opening size for makeup air in a closet designed for the installation of a clothes dryer is specified as 100 square inches. This requirement is established to ensure adequate airflow for the dryer to operate efficiently. Proper makeup air prevents negative pressure in the closet, which can hinder the dryer’s performance and potentially create safety hazards, such as combustion appliance backdrafting or inefficient drying.

Having a 100 square inch opening helps maintain a balance in airflow, allowing the dryer to function effectively while ensuring that it can draw in the necessary air for combustion and ventilation. This size considers typical dryer exhaust flows and the need for a sufficient source of replacement air, making it crucial for both performance and safety in residential applications.