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6
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.
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)
Example vent system
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)
Electrical Requirements
Observe all governing codes and ordinances.
Ensure that the electrical installation is adequate and in
conformance with National Electrical Code, ANSI/NFPA 70
(latest edition), or CSA Standards C22.1-94, Canadian Electrical
Code, Part 1 and C22.2 No. 0-M91 (latest edition) and all local
codes and ordinances.
If codes permit and a separate ground wire is used, it is
recommended that a qualifi ed electrician determine that the
ground path is adequate.
A copy of the above code standards can be obtained from:
National Fire Protection Association
1 Batterymarch Park
Quincy, MA 02169-7471
CSA International
8501 East Pleasant Valley Road
Cleveland, OH 44131-5575
■ A 120 V ~, 60 Hz, 463 W, AC only, 3.8 A, fused electrical
circuit is required.
■ If the house has aluminum wiring, follow the procedure
below:
Connect the aluminum wiring using special connectors
and/or tools designed and UL listed for joining copper to
aluminum.
Follow the electrical connector manufacturer’s
recommended procedure. Aluminum/copper connection
must conform with local codes and industry accepted wiring
practices.
■ Wire sizes and connections must conform with the rating of
the appliance as specifi ed on the model/serial rating plate.
The model/serial plate is located behind the fi lter on the rea
wall of the range hood.
■ Wire sizes must conform to the requirements of the National
Electrical Code, ANSI/NFPA 70 (latest edition), or CSA
Standards C22. 1-94, Canadian Electrical Code, Part 1 and
C22.2 No. 0-M91 (latest edition) and all local codes and
ordinances.
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
F
G
D
A
A
B
C
D
A
A
H
E
90 elbow
6 ft (1.8 m)
2 ft
(0.6 m)
Wall cap
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