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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
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
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)
4.5 ft
(1.4 m)
1 ft
(0.3 m)
5.0 ft
(1.5 m)
5.0 ft
(1.5 m)
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) or
= 22.5 ft (6.8 m)
3¹⁄₄" x 10"
(8.3 cm x 25.4 cm)
system
Install Vent System
WARNING
Excessive Weight Hazard
Use two or more people to move and install
downdraft vent.
Failure to do so can result in back or other injury.
1. Place cardboard or similar material on top of a flat surface
where you can easily assemble the downdraft vent system.
2. Remove parts packages, downdraft vent and blower box
from the carton.
3. Remove all shipping materials, tape and film from the
downdraft vent and blower box.
6 ft
(1.8 m)
2 ft (0.6 m)
9
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