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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.
31/4'' x 10" (8.3 cm x 25.4 cm)
Vent Piece
Rectangular
31/4"x 10" (8.3 cm x 25.4 cm)
5.0 ft
90 ° elbow
(1.5 m)
31/4 '' x 10" (8.3 cm x 25.4 cm)
12.0 ft
flat elbow
(3.7 m)
31/4 '' x 10" (8.3 cm x 25.4 cm)
0.0 ft
wall cap
(0.0 m)
Vent Piece
6" (15.2 cm) Round
45 ° elbow
2.5 ft
(0.8 m)
90 ° elbow
5.0 ft
(1.5 m)
6" (15.2 cm)
0.0 ft
wall cap
(0.0 m)
31A'' x 10" (8.3 cm x 25.4 cm)
4.5 ft
to 6" (15.2 cm) transition
(1.4 m)
6" (15.2 cm) to 31A'' x 10"
1 ft
(8.3 cm x 25.4 cm) transition
(0.3 m)
31A'' x 10" (8.3 cm x 25.4 cm)
5.0 ft
to 6" (15.2 cm) 90 ° elbow
(1.5 m)
transition
6" (15.2 cm) to 31A'' x 10"
5.0 ft
(8.3 cm x 25.4 cm) 90 ° elbow
(1.5 m)
transition
Example Vent System
C
A
%%
2 ft (0.6 m)
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
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.
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