Calculating Vent System Length
To calculate the length of the system you need, add the
equivalent feet (meters) for each vent piece used in the system.
6" (15.2 cm) or Larger Round Vent System
Vent Piece Round
45° elbow 2.5 ft
(0.8m)
31/4''x 10" (8.3 cm x 25.4 cm) Vent System
Vent Piece
31/4"x 10" (8.3 cm x 25.4 cm) 5.0 ft
90° elbow (1.5 m)
31/4"x 10" (8.3 cm x 25.4 cm) 12.0 ft
flat elbow (3.7 m)
90° elbow 5.0 ft
(1.5m)
6" (15.2 cm) or larger 0.0 ft
wall cap (0.0 m)
3%" x 10" (8.3 cm x 25.4 cm) 4.5 ft
to 6" (15.2 cm) or larger (1.4 m)
3%" x 10" (8.3 cm x 25.4 cm) 5.0 ft
to 6" (15.2 cm) or larger (1.5 m)
90° elbow
Example vent system
6ft(1.8m) --_'1 Wallcap
2 it (0.5m)
_!=
Maximum Recommended Length = 50 ft (15.2 m)
1 - 90 ° elbow
1 - wall cap
8 ft (2.4 m) straight
Length of 7" (17.8 cm) system
= 5.0 ft (1.5 m)
= 0.0 ft (0.0 m)
= 8.0 ft (2.4 m)
= 13.0 ft (3.9 m)
31/4"x 10" (8.3 cm x 25.4 cm) 0.0 ft
wall cap (0.0 m)
Example vent system
31/4" xlO"
(8.3 x 25.4 cm)
embow
6 ft (1.8 rn)
/
Maximum Recommended Length
Wall cap
= 35 ft (10.7 m)
1 - 90° elbow
8 ft (2.4 m) straight
1 - wall cap
Length of 31/4'' x 10" (8.3 cm x 25.4 cm)
system
= 5.0 ft (1.5 m)
= 8.0 ft (2.4 m)
= 0.0 ft (0.0 m)
= 13.0 ft (3.9 m)