Calculating Vent System Length - KitchenAid KVWC956KSS Quick Start Manual

DIMENSIONS
RANGE HOOD - 36" (91.4 CM) AND 48" (121.9 CM)
Typical In-line Blower Motor System Venting Installations

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.
The maximum equivalent vent lengths are:
10" (25.4 cm) round vents - 60 ft (18.3 m)
Example vent system
The following example falls within the maximum recommended vent length.
D
B
A
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
Vent Piece
° elbow
45
° elbow
90
90 elbow
2 ft
(0.6 m)
1 - 90° elbow
1 - wall cap
8 ft (2.4 m) straight
Length of system
C
E
D
F
G
H
A
Equivalent Length
2.5 ft (0.8 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)
A
A
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