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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
Total six 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.
INTERNET VERSION FOR REFERENCE ONLY