Owner's Manual

10
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)
3
1
/
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 3
1
/
4
"
x 10" (8.3 cm x
25.4 cm) transition
1 ft
(0.3 m)
3
1
/
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 3
1
/
4
"
x 10" (8.3 cm x
25.4 cm) 90° elbow
transition
5.0 ft
(1.5 m)
Vent Piece 5" (12.7 cm) or 6"
(15.2 cm) Round
3
1
/
4
" x 10" (8.3 cm x
25.4 cm) 90° elbow
5.0 ft
(1.5 m)
3
1
/
4
" x 10" (8.3 cm x
25.4 cm) flat elbow
12.0 ft
(3.7 m)
3
1
/
4
" x 10" (8.3 cm x
25.4 cm) wall cap
0.0 ft
(0.0 m)
Straight 3
1
/
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
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 flexible vent is not recommended.
Flexible vents create back pressure and air turbulence that greatly
reduce performance.
Wall cap
6 ft (1.8 m)
90° elbow
2 ft
(0.6 m)