Return Air Grille Size Cfm

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Return Air Grille Size Cfm

Nominal Size (in x in), Approximately Capacity (cfm). 10 x 4, 100. 10 x 5, 125. 10 x 6, 155. 10 x 8, 215. 12 x 4, 120. 12 x 5, 155. 12 x 6, 190. 12 x 8, 260. 12 x 10 .
For proper operation, plan on 2 CFM per square inch of filter grille area. So if your furnace puts out 800 CFM, you need 400 square inches of filter grille area.
plastic. Many sizes in stock for quick shipment. Flexible Air Duct. Flexible air duct systems UL Greenguard Gold certified for residential and commercial applica- tions.. .. End View Showing Depth with Valve Open: 265 Floor Return. Air Grille.
2: Sizing return grilles is easy; just use the 1 sq.ft. per ton or 100 sq.in. per ton rule. x 25-in. grille has 500 square inches of gross area (500 x 2 cfm 1,000 cfm).
CFM. SUPPLY OR RETURN (1). MAIN DUCT SIZE. OR. 200. 300. OR. 400. 500. OR. PANNED JOIST 14" X 8". AIRFLOW. CFM. RETURN AIR. GRILLE SIZE.
Calculating return grill size is really a velocity issue because. -for each grill divide your total air (CFM) by the max velocity (FPM) to determine .

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