Make-up air – A.O. Smith 120 trough 500 User Manual
Page 9
BTR TANK TYPE HEATERS
SERVICE HANDBOOK
A.O. Smith Water Products
Service Handbook
Irving, Texas ©2000
Training Department
8
MAKE-UP AIR
HORIZONTAL DUCTS
When the heater is installed in an interior room with no roof access for vertical ducts,
horizontal make-up air ducts should be installed.
When using horizontal ducts, 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 2000 BTUH of the total input of all appliances within the
enclosure.
1 Square
Inch Per
2,000
BTUH
Daily Schedule
See also other documents in the category A.O. Smith Water boiler:
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- BT-100 (2 pages)
- BTI-80 (2 pages)
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