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For the most efficient and quiet operation:
■ Use no more than three 90° elbows.
■ Make sure there is a minimum of 24" (61 cm) of straight vent
between the elbows if more than 1 elbow is used.
■ Do not install 2 elbows together.
■ Use clamps to seal all joints in the vent system.
■ The vent system must have a damper. If roof or wall cap has a
damper, do not use damper supplied with the range hood.
■ Use caulking to seal exterior wall or roof opening around the
cap.
Cold Weather Installations
An additional back draft damper Non return valve should be
installed to minimize backward cold air flow and a thermal break
should be installed to minimize conduction of outside tempera-
tures as part of the vent system. The damper Non return valve
should be on the cold air side of the thermal break.
The break should be as close as possible to where the vent
system enters the heated portion of the house.
Venting Methods
Vent system can terminate either through the roof or wall. Use
3.2" x 10" (8.3 x 25.4 cm) rectangular with a maximum vent
length of 35 ft (10.7 m) or 7" (17.8 cm) or larger round vent with a
maximum length of 50 ft (15.2 m) for vent system.
NOTE: Flexible vent is not recommended. Flexible vent creates
back pressure and air turbulence that greatly reduces
performance.
Roof Venting
B
A
C
A. 7" (17.8 cm) round vent
through roof
(purchased separately).
3.25" x 10" (8.3 x 25.4 cm)
rectangular vent through the
roof (purchased separately).
B. Roof cap
(purchased separately)
C. 24" (60.9 cm) min. to
27" (68.6 cm) max. above the
cooking surface.
Wall Venting
A
B
C
A. 7" (17.8 cm) round vent out the
top and through the wall
(purchased separately).
3.25" x 10" (8.3 x 25.4 cm)
rectangular vent through the
wall or out the top (purchased
separately).
B. Wall cap
(purchased separately)
C. 18" (45.7 cm) min. to
24" (61.0 cm) max. above the
cooking surface.
Calculating Vent System Length
To calculate the length of the system you need, add the
equivalent feet (meters) for each vent piece used in the system.
7" (17.8 cm) Round Vent System
Vent Piece
45° elbow
90° elbow
7" (17.8 cm)
3.2" x 10" (8.3 cm x 25.4 cm)
to 7" (17.8 cm)
3.2" x 10" (8.3 cm x 25.4 cm)
to 7" (17.8 cm) 90° elbow
Example Vent System
7" (17.8 cm) round
2 ft (0.6 m)
Maximum Recommended Length = 50 ft (15.2 m)
1 - 90° elbow
1 - wall cap
8 ft (2.4 m) straight
Length of 7" (17.8 cm) system
6
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)
5.0 ft
(1.5 m)
Wall cap
6 ft (1.8 m)
= 5.0 ft (1.5 m)
= 0.0 ft (0.0 m)
= 8.0 ft (2.4 m)
= 13.0 ft (3.9 m)
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