KitchenAid 30" Installation Instructions And Use & Care Manual page 10

Calculating Vent System Length
3¼" x 10" (8.3 x 25.4 cm) rectangular vent is required from the
blower motor box. It can be transitioned to 6" (15.2 cm) round
vent if needed.
Maximum Length of Vent System
Vent
6" (15.2 cm) round
3¹⁄₄" x 10" (8.3 cm x 25.4 cm)
To calculate the length of the system you need, add the
equivalent feet (meters) for each vent piece used in the system.
Vent Piece
3¹⁄₄" x 10" (8.3 cm x 25.4 cm)
90° elbow
3¹⁄₄" x 10" (8.3 cm x 25.4 cm)
flat elbow
3¹⁄₄" x 10" (8.3 cm x 25.4 cm)
wall cap
Vent Piece
45° elbow
90° elbow
6" (15.2 cm)
wall cap
10
Length
35 ft (8.9 m)
35 ft (8.9 m)
3¹⁄₄" x 10" (8.3 cm x 25.4 cm)
Rectangular
5.0 ft
(1.5 m)
12.0 ft
(3.7 m)
0.0 ft
(0.0 m)
6" (15.2 cm) Round
2.5 ft
(0.8 m)
5.0 ft
(1.5 m)
0.0 ft
(0.0 m)
3¹⁄₄" x 10" (8.3 cm x 25.4 cm)
to 6" (15.2 cm) transition
6" (15.2 cm) to 3¹⁄₄" x 10"
(8.3 cm x 25.4 cm) transition
3¹⁄₄" x 10" (8.3 cm x 25.4 cm)
to 6" (15.2 cm) 90° elbow
transition
6" (15.2 cm) to 3¹⁄₄" x 10"
(8.3 cm x 25.4 cm) 90° elbow
transition
Example Vent System
C
B
A
D
A. Blower motor
B. Transition
C. 90° elbows
D. Back draft damper
The following example falls within the maximum vent length of
35 ft (8.9 m).
2 - 90° elbow = 10.0 ft (3 m)
1 - wall cap = 0.0 ft (0.0 m)
8 ft (2.4 m) straight = 8.0 ft (2.4 m)
Transition = 4.5 ft (1.4 cm)
Length of 6" (15.2 cm) = 22.5 ft (6.8 m)
or 3¹⁄₄" x 10"
(8.3 cm x 25.4 cm)
system
4.5 ft
(1.4 m)
1 ft
(0.3 m)
5.0 ft
(1.5 m)
5.0 ft
(1.5 m)
6 ft
(1.8 m)
2 ft (0.6 m)