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) wall cap
Example vent system
2 ft (0.6 m)
1 - 90° elbow
1 - wall cap
8 ft (2.4 m) straight
Maximum Recommended Length
7" (17.8 cm) Round Vent
2.5 ft (0.8 m)
5 ft (1.5 m)
0 ft (0 m)
6 ft (1.8 m)
= 5 ft (1.5 m)
= 0 ft (0 m)
= 8 ft (2.4 m)
= 13 ft (3.9 m)
= 50 ft (15.2 m)
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 qualified 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
8501 East Pleasant Valley Road
Cleveland, OH 44131-5575
A 120 volt, 60 Hz., AC only, 15-amp, fused
electrical circuit is required.
If the house has aluminum wiring, follow
the procedure below:
1. Connect a section of solid copper wire
to the pigtail leads.
2. Connect the aluminum wiring to the added section
of copper wire 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 specified on the model/serial/rating
plate. The model/serial/rating plate is located inside the
range hood on the left wall.
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