"If 150 cfm is 6" then if I work backwards to achieve similar flow (FPS) I get 270 cfm for an 8" round and 350 cfm for an 8" square duct."
Good numbers for usual blower pressures.
Grills for boots to ducts often restrict the sq ft cross-section free area of the grill to half, so having oversized grills is a benefit.
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