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.
5" (12,7 cm) and 6" (15.2 cm) Vent System
Vent Piece
Straight round
45° elbow
90° elbow
6" (15.2 cm) wall cap
3
1
/
" x 10" (8.3 cm x 25.4 cm)
4
to 6" (15.2 cm) transition
6" (15.2 cm) to 3
1
/
" x 10"
4
(8.3 cm x 25.4 cm) transition
3
1
/
" x 10" (8.3 cm x 25.4 cm)
4
to 6" (15.2 cm) 90° elbow
transition
6" (15.2 cm) to 3
/
" x 10"
1
4
(8.3 cm x 25.4 cm) 90° elbow
transition
8
2.5 ft
(0.8 m)
5.0 ft
(1.5 m)
0.0 ft
(0.0 m)
4.5 ft
(1.4 m)
1 ft
(0.3 m)
5.0 ft
(1.5 m)
5.0 ft
(1.5 m)
3
/
" x 10" (8.3 cm x 25.4 cm) Vent System
1
4
Vent Piece
3
/
" x 10" (8.3 cm x 25.4 cm)
1
4
90° elbow
3
1
/
" x 10" (8.3 cm x 25.4 cm)
4
flat elbow
3
/
" x 10" (8.3 cm x 25.4 cm)
1
4
wall cap
Straight 3
/
" x 10"
1
4
(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
Example 6" (15.2 cm) vent system
Venting between floor joists
90° elbow
2ft
(0.6 m)
Maximum length
1- 90° elbow
8 ft (2.4 m) straight
1 - wall cap
System length
NOTE: For external venting, a flexible vent is not
recommended. Flexible vents create back pressure and air
turbulence that greatly reduce performance.
5.0 ft
(1.5 m)
12.0 ft
(3.7 m)
0.0 ft
(0.0 m)
2.0 ft
(0.6 m)
Wall cap
6ft (1.8 m)
= 60 ft (18.3 m)
= 5 ft (1.5 m)
= 8 ft (2.4 m)
= 0 ft (0 m)
= 13 ft (3.9 m)