HVAC Premium Return Air Grille Sizing
How to Determine the Direction for Cold Air Return Grilles Air Conditioning Attic Installation 2019 According to this rule of thumb, the return grille I picked at 30×12 would be 360 square inches X two = 720 CFM. In the future, I plan to use Should You Put a Filter In All Of Your Return Vents? #hvac #hvactraining #airconditioning HVAC Sizing Explained: Filter and Return Grill Sizing A filter grill should be sized for a maximum face velocity of 300 FPM. A non-filtered grill should be sized for a maximum face velocity of 500 ...