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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.
7" (17.8 cm) Vent System
Vent Piece 7" (17.8 cm) Round
45° elbow 2.5 ft
(0.8m)
3Y4"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)
31/4"x 10" (8.3 cm x 25.4 cm) 0.0 ft
wall cap (0.0 m)
7" (17.8 cm) 0.0 ft
wall cap (0.0 m)
3%" x 10" (8.3 cm x 25.4 cm) 4.5 ft
to 7" (17.8 cm) (1.4 m)
3%" x 10" (8.3 cm x 25.4 cm) 5.0 ft
to 7" (17.8 cm) 90 ° elbow (1.5 m)
Example vent system
90° elbow Wall cap
o. (18 .................
rn)
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)
Example vent system
31/4" xlO"
(8.3 x 25.4 cm)
elbow
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)
6
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