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8
Calculating Vent System Length
IMPORTANT: This range is rated at 60 ft (18.3 m) of 6"
(15.2 cm) or 30 ft (9.15 m) of 5" (12.7 cm) straight duct. To
calculate the length of the system you need, add the equivalent
feet (meters) for each vent piece used in the system.
Vent Piece
5" (12.7 cm)
or 6" (15.2 cm)
Round
Straight round
45° elbow
2.5 ft
(0.8 m))
90° elbow
5.0 ft
(1.5 m)
6" (15.2 cm) wall cap
0.0 ft
(0.0 m)
3¹⁄4" x 10" (8.3 cm x 25.4 cm)
to 6" (15.2 cm) transition
4.5 ft
(1.4 m)
6" (15.2 cm) to 3¹⁄4" x 10"
(8.3 cm x 25.4 cm) transition
1 ft
(0.3 m)
3¹⁄4" x 10" (8.3 cm x 25.4 cm)
to 6" (15.2 cm) 90° elbow
transition
5.0 ft
(1.5 m)
6" (15.2 cm) to 3¹⁄4" x 10"
(8.3 cm x 25.4 cm) 90° elbow
transition
5.0 ft
(1.5 m)
3¹⁄4" x 10" (8.3 cm x 25.4 cm)
90° elbow
5.0 ft
(1.5 m)
3¹⁄
4
" x 10" (8.3 cm x
25.4 cm) at elbow
12.0 ft
(3.7 m)
3¹⁄
4
" x 10" (8.3 cm x
25.4 cm) wall cap
0.0 ft
(0.0 m)
Straight 3¹⁄
4
" x 10"
(8.3 cm x 25.4 cm)
5" (12.7 cm) thermal break
Part Number 708786A
6" (15.2 cm) thermal break
Part Number 715557A
2.0 ft
(0.6 m)
Example 6" (15.2 cm) vent system
Venting Between Floor Joists
90 elbo
w
6 ft (1.8 m)
2 ft
(0.6 m)
Wall cap
Maximum length = 60 ft (18.3 m)
1- 90° elbow = 5 ft (1.5 m)
8 ft (2.4 m) straight = 8 ft (2.4 m)
1 - wall cap = 0 ft (0 m)
System length = 13 ft (3.9 m)
NOTE: For external venting, a exible vent is not
recommended. Flexible vents create back pressure and air
turbulence that greatly reduce performance.
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