A. O. Smith Water Products Company Service Handbook
Irving, Texas 2000
©
Training Department
7
MAKE-UP AIR
VERTICAL DUCTS
Often it is more practical to install vertical make-up air ducts to the out doors. Again, two openings are required
- within 12 inches (30 cm.) of the top of the enclosure and one within 12 inches (30 cm.) of the bottom of the
enclosure. Each opening shall have a free area of not less than 1 square inch per 4000 BTUH of the total input
of all appliances within the enclosure.
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