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Fresh Air Duct Capacities
For Ducts Supplying
Fresh Air To Boiler In Tightly Constructed
Houses
3 V2" x 12"
8" x 8"
8" x 12"
8" x 16"
144,000
256,000
384,000
512,000
36,000
64,000
96,000
128,000
i08,000
192,000
288,000
384,000
*Btuh
= British Thermal Units per hour based on
opening covered by _ " mesh screen,
wood lou-
vers, or metal louvers.
Figure
4 - Fresh
Air Openings
t2 CIEAR
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