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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.
6" (15.2 cm) or Larger Round Vent System
Vent Piece Round
45° elbow 2.5 ft __
(0.8m)
90° elbow 5.0 ft
(1.5m)
6" (15.2 cm) or larger 0.0 ft
wall cap (0.0 m)
31/4'' x 10" (8.3 cm x 25.4 cm) 4.5 ft
to 6" (15.2 cm) or larger (1.4 m)
31/4"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
90 ° elbow
Wall
cap
_qr_-- 6 ft (1.8rn) -------_1
I
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)
31A11x 10" (8.3 cm x 25.4 cm) Vent System
VentPiece
31/4'' x 10" (8.3 cm x 25.4 cm) 5.0 ft
90° elbow (1.5 m)
31A'' x 10" (8.3 cm x 25.4 cm) 12.0 ft
flat elbow (3.7 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,,x 10 ,,
(8.3 x 25.4 cm)
elbow
I_ 6tt (1.8rn) _ Wall cap
/
Maximum Recommended Length = 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)
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