How to Determine Required Return Grille Airflow

4085265When designing or redesigning an HVAC system, many contractors have asked how to determine the amount of airflow a return grille should pull from the conditioned space. Supply airflow is determined by ACCA Manual J or by some other accepted method depending on the heat loss or heat gain of each room. Here’s a quick and simple method to establish return grille required airflow that works every time. Read More