Make-up air – A.O. Smith 120 trough 500 User Manual
Page 8
BTR TANK TYPE HEATERS
SERVICE HANDBOOK
A.O. Smith Water Products
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 - one within 12 inches of the top of the enclosure and one within
twelve inches 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.
1 Square
Inch Per
4,000
BTUH
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