Transfer Grille Size Calculator
Adjust the data in the blue boxes, press enter or click "Calculate"
		Door Undercut
Room CFM		Height		Width		Needed Transfer Grille Area			Jump Duct Diameter
			" by		"	24.5 inches square (0.2 sq. ft.)			5.6 inches
If the free area of grille is					%	, and side (a) is		" , side (b) should be	3.71 inches
The calculated grille area will be large enough to maintain less than 0.012" wc (3 pascals) pressure difference to prevent the pressurization of bedrooms and depressurization of the common area. This limits the amount of air that will be forced into or drawn from the attic, crawlspace etc. More info on transfer grilles from this link;
The Building Science Corporation.

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