Venting continued-
EXAMPLE: The exhaust has two 90° elbows and the intake has four 90° elbows. The total feet of straight pipe on the exhaust is 15 ft. (4.6 m) and the total feet of straight pipe on the intake is 20 ft (6.1 m).
Figure 3
six 90° elbows x 5 ft. each = 30 ft Total straight pipe = 11 ft+3 ft+1 ft+3 ft+9 ft+6 ft+2 ft= 35 ft Total equivalent feet = 65 ft
Totalsix 90° elbows x 1.5 m each = 9.0m straight pipe=3.4m+.91m+.31m+.91m+2.7m+1.8m+.61m = 10.6m
Total equivalent meters = 19.6m
IMPORTANT
For 3” (7.6 cm) vent piping, the total equivalent feet of venting (intake plus exhaust) must not exceed 80 feet (24.4 m) and the total equivalent feet of venting (intake or exhaust) must not exceed 40 feet (12.2 m). The total equivalent feet of intake must be within 20 feet (6.1 m) of the total equivalent feet of exhaust. See Table 2 for common 3” (7.6 cm) vent lengths.
For 4” (10.2 cm) vent piping, the total equivalent feet of venting (intake plus exhaust) must not exceed 150 feet (45.7 m) and the total equivalent feet of venting (intake or exhaust) must not exceed 75 feet (22.9 m). The total equivalent feet of intake must be within 20 feet (6.1 m) of the total equivalent feet of exhaust. See Table 3 for common 4” (10.1 cm) vent lengths.
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