Exterior clearance – A.O. Smith 120 trough 500 User Manual
Page 5
BTR TANK TYPE HEATERS
SERVICE HANDBOOK
A.O. Smith Water Products
Service Handbook
Irving, Texas ©2000
Training Department
4
EXTERIOR CLEARANCE
This illustrates the exterior roof clearances for BTR units with natural draft venting. The
vent shall extend at least 3 feet above the highest point where it passes through a roof of
a building, and at least 2 feet higher than any portion of a building within a horizontal
distance of 10 feet (for vents of 12" in diameter or less). (NFPA 54 ANSI Z 223.1 SEC
7.5.2a). (Sec 7.6.2a may allow reduction to 8 feet with a “ Listed vent cap”).
"Copyright by the American Gas Association. Used by permission of the copyright holder".
See also other documents in the category A.O. Smith Water boiler:
- ACGSS02407 (4 pages)
- 401 (48 pages)
- 6-119 (28 pages)
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- BTH 400A (36 pages)
- DB-720 thru 1810 (4 pages)
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- 300A (40 pages)
- 185363-001 (32 pages)
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- 25 litres (11 pages)
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- 12 50GPC T 100 (56 pages)
- GB/GW-200 (10 pages)
- GWT-2500 (4 pages)
- VB 750 (8 pages)
- BTH 400 (1 page)
- 000 (4 pages)
- LB/LW: 500 (12 pages)
- VW-500 through VW-1000 (4 pages)
- BT-100 (2 pages)
- BTI-80 (2 pages)
- Voltex Hybrid Electric PHPT-80 (20 pages)