TABLE 9
2” (5.1 cm) PVC VENT CONNECTOR LENGTHS FROM INSIDE WALL FOR
LOW GROUND CLEARANCE INSTALLATIONS
Terminating | # of | Maximum | Minimum |
| Elbows | Length | Length |
(2) 90° Elbows with Vent Terminal | 0 | 35 ft (10.7 | 2 ft (.6 m) |
|
| m) |
|
(2) 90° Elbows with Vent Terminal | 1 | 30 ft (9.2 m) | 2 ft (.6 m) |
(2) 90° Elbows with Vent Terminal | 2 | 25 ft (7.6 m) | 2 ft (.6 m) |
(2) 90° Elbows with Vent Terminal | 3 | 20 ft (6.1 m) | 3 ft (.9 m) |
(2) 90° Elbows with Vent Terminal | 4 | 15 ft (4.6 m) | 4 ft (1.2 m) |
TABLE 10
3” (7.6 cm) VENT CONNECTOR LENGTHS FROM INSIDE WALL FOR LOW
GROUND CLEARANCE INSTALLATIONS
Terminating (Reduce 3” to 2”) | #of | Maximum | Minimum |
(Reduce 7.6 cm to 5.1 cm) | Elbows | Length | Length |
(2) 90° Elbows with Vent Terminal | 0 | 90 ft (27.5 m) | 10 ft (3.1 m) |
(2) 90° Elbows with Vent Terminal | 1 | 85 ft (25.9 m) | 10 ft (3.1 m) |
(2) 90° Elbows with Vent Terminal | 2 | 80 ft (24.4 m) | 10 ft (3.1 m) |
(2) 90° Elbows with Vent Terminal | 3 | 75 ft (22.9m) | 10 ft (3.1 m) |
(2) 90° Elbows with Vent Terminal | 4 | 70 ft (21.4 m) | 10 ft (3.1 m) |
(2) 90° Elbows with Vent Terminal | 5 | 65 ft (19.8 m) | 12 ft (3.7 m) |
HIGH ALTITUDE INSTAL LATIONS FOR ELEVATIONS OVER 2,000 FEET (610 m) ABOVE SEA LEVEL
The capacity of the induced draft blower declines with increasing altitude due to a reduction in the air density. In order to assure safe and reliable performance of the water heater, the following guidelines must be followed. Refer to the venting tables below for maximum distances for the altitudes in your location.
TABLE 11 - HIGH ALTITUDE VENT CONNECTOR MODIFICATIONS
Altitude above sea | Maximum venting | Maximum venting |
level | length reduction | length reduction from |
| from tables 7 & 9 | tables 8 & 10 |
0 - 2,000 ft | No reduction in vent | No reduction in vent |
(0 - 610 m) | length required | length required |
over 2,000 - 5,000 ft | Reduce maximum vent | No reduction in vent |
(over 610 - 1524 m) | length by 20 ft (6.1 m) | length required |
over 5,000 - 8,000 ft | Use only 3” (7.6 cm) | No reduction in vent |
(over 1524 - 2439 m) | PVC (Tables 8 & 10) | length required |
over 8,000 - 10,000 ft | Use only 3” (7.6 cm) | Reduce maximum vent |
(over 2439 - 2540 m) | PVC (Tables 8 & 10) | length by 20 ft (6.1 m) |
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