A.O. Smith BTH 120 Service Handbook - Make-Up Air
Other manuals for BTH 120:
Service handbook
Manual is about: COMMERCIAL GAS HIGH EFFICIENCY WATER HEATERS BTH 120 THRU 500
SERIES 200/201
of
65
A. O. Smith Water Products Company
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
ducts should be installed. When using horizontal ducts, 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 enclo-
sure. 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.
Fresh Air
Fresh Air
Fresh Air
Fresh Air
Fresh Air
Fresh Air
Fresh Air
Fresh Air
Fresh Air
Fresh Air