Because Whirlpool Corporation policy includes a continuous commitment to improve
our products, we reserve the right to change materials and specifications without notice. Dimensions are for planning purposes only. For complete details, see Installation
Instructions packed with product. Specifications subject to change without notice. Ref. W10331007B
3/30/11
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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.
Vent Piece Equivalent Length
45°elbow 2.5 ft
(0.8 m)
90°elbow 5.0 ft
(1.5 m)
The maximum equivalent vent lengths are:
10" (25.4 cm) round vents - 60 ft (18.3 m)
Roof Venting Wall Venting Wall Venting
A. Roof cap
B. 10" (25.4 cm)
round vent
A. Wall cap
B. 10" (25.4 cm)
round vent
A. Wall cap
B. 10" (25.4 cm)
round vent
A
A
B
BB
A
The following example falls within the maximum recommended vent
length.
1 - 90°elbow = 5.0 ft (1.5 m)
1 - wall cap = 0.0 ft (0.0 m)
8 ft (2.4 m) straight = 8.0 ft (2.4 m)
Length of system = 13.0 ft (3.9 m)
Example vent system
90 elbow 6 ft (1.8 m)
2 ft
(0.6 m)
Wall cap
VENTING REQUIREMENTS
● Vent system must terminate to the outdoors.
● Do not terminate the vent system in an attic or other enclosed area.
● Do not use 4" (10.2 cm) laundry-type wall caps.
● Use metal vent only. Rigid metal vent is recommended. Plastic or
metal foil vent is not recommended.
● The length of vent system and number of elbows should be kept to a
minimum to provide efficient performance.
For the most efficient and quiet operation:
● Use no more than three 90°elbows.
● Make sure there is a minimum of 24" (61.0 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 the roof or wall cap has a
damper, do not use the damper supplied with the range hood.
● Use caulking to seal exterior wall or roof opening around the cap.
● The size of the vent should be uniform.
Venting Methods
Typical Internal Blower Motor System Venting Installations
A 10" (25.4 cm) round vent system is needed for installation (not
included). The hood exhaust opening is 10" (25.4 cm) round.
NOTE: Flexible vent is not recommended. Flexible vent creates back
pressure and air turbulence that greatly reduce performance.
Vent system can terminate either through the roof or wall.
Typical In-line Blower Motor System Venting Installations
A. 10" (25.4 cm) round vent
B. Mount on top of ceiling joists.
C. Roof caps
D. Plywood (optional for some installations)
E. Mount on underside of roof rafters.
F. Mount from cross-members tied to trusses.
G. Duct horizontal; mount to cross-members
tied to trusses.
H. Wall cap
FG
D
A
A
B
C
D
A
H
E
