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Fresh Air ¼" Mesh Screen Wood Louvers Metal Louvers
Duct Size
(Btuh)*
3-½" x 12"
144,000
8" x 8"
256,000
8" x 12"
384,000
8" x 16"
512,000
*Btuh = British Thermal Units per hour based on opening covered by ¼" mesh
screen , wood louvers, or metal louvers.
(Btuh)*
(Btuh)*
36,000
108,000
64,000
192,000
96,000
288,000
128,000
384,000
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