What is the air capacity in cubic feet per minute for 10-inch joists used for return air?

The air capacity for a 10-inch joist used for return air is determined by factors such as the size of the joist and the specifics of the system it’s a part of. In this case, a 10-inch joist typically provides an optimal airflow capacity of 525 cubic feet per minute (cfm).

This value is derived from engineering tables or standards that specify the air-moving capabilities of ductwork or joist spaces when used for HVAC applications. Adequate airflow is critical for efficient heating, ventilation, and air conditioning, as it helps ensure that the return air system can effectively draw air back into the system for reconditioning.

Understanding this value is important for designing and assessing HVAC systems to ensure they meet required airflow needs for the space they serve. This also helps maintain proper pressure balance and efficiency within the system.