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18
Figure 7C
Through the Wall Venting With Low Ground Clearance:
When venting cannot exit through the wall at a height greater than or equal to 12” (30.5 cm) (and above expected snow
level) from the ground, then the installation must be modified as shown below (see Figure 8). Refer to Tables 3 or 4 for
maximum venting lengths using 3” (7.6 cm) or 4” (10.2 cm) diameter pipe.
Figure 8
TABLE 3
3” (7.6 cm) EXHAUST VENT OR COMBUSTION AIR INTAKE PIPE LENGTHS FROM INSIDE WALL
FOR LOW GROUND CLEARANCE INSTALLATIONS
Termination # of Elbows Maximum Length
(2) 90 Elbows with (1) 90 Elbow
1 30 ft (9.1 m)
(2) 90 Elbows with (1) 90 Elbow
2 25 ft (7.6 m)
(2) 90 Elbows with (1) 90 Elbow
3 20 ft (6.1 m)
(2) 90 Elbows with (1) 90 Elbow
4 15 ft (4.6 m)
TABLE 4
4” (10.2 cm) EXHAUST VENT OR COMBUSTION AIR INTAKE PIPE LENGTHS FROM INSIDE WALL
FOR LOW GROUND CLEARANCE INSTALLATIONS
Termination # of Elbows Maximum Length
(2) 90 Elbows with (1) 90 Elbow
1 45 ft (13.7 m)
(2) 90 Elbows with (1) 90 Elbow
2 40 ft (12.2 m)
(2) 90 Elbows with (1) 90 Elbow
3 35 ft (10.7 m)
(2) 90 Elbows with (1) 90 Elbow
4 30 ft (9.1 m)