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5
INSTALLATION INSTRUCTIONS
CAUTION: Before beginning the installation, switch the power off at the circuit breaker and lock the
service, disconnecting means to prevent power from being switched on accidentally.
When the service disconnecting means cannot be locked, securely fasten a prominent
warning device, such as a tag, to the breaker.
Ductwork Requirements
NOTE: Read the ductwork sections only if you do not have existing ductwork. If you have existing
ductwork, skip to the Damage section, and proceed.
The venting system must exhaust to the outside. This hood can be vented vertically through upper
cabinets or horizontally into an outside wall. Ductwork is not included.
CAUTION: To reduce the risk of fire and to properly exhaust air, be sure to duct the air outside. Do
NOT vent exhaust air into spaces within walls or into ceilings, attics, crawl spaces, or
garages.
Exhaust Connection
The hood exhaust has been designed to mate with a standard 3 ¼” x 10” rectangular ducting or a 7”
diameter transition adaptor must be used. If a rectangular-to-round transition adaptor is used, the
bottom corners of the damper will have to be cut to fit, using tin snips, in order to allow free
movement of the damper. Equivalent lengths of duct pieces are based on actual tests and reflect
requirements for good venting performance with any hood. Do NOT use less than a 6” diameter
duct.
Maximum Duct Length
For satisfactory air movement, the total duct length of a 3 ¼” x 10” rectangular, or 6” or 7” diameter
round duct should not exceed 65 equivalent feet. See the Worksheet – Calculate Total Equivalent
Ductwork Length section.
NOTE: It is important that ducting be installed using the most direct route and with as few elbows as
possible. This ensures clear venting of exhaust and helps prevent blockages. Also, make
sure dampers swing freely and nothing is blocking the ducts. When applicable, install any
makeup (replacement) air system in accordance with local building code requirements.
Elbows, transitions, wall, and roof caps present additional resistance to airflow and are equivalent to
a section of straight duct longer than their actual physical size. When calculating the total duct
length, add the equivalent lengths of all transitions and adaptors plus the length of all straight duct
sections. The charts on the following pages show you how to calculate total equivalent ductwork
length using the approximate feet of equivalent length of some typical ducts.
Damage
• If the unit is damaged in shipment, return the unit to the store in which it was bought for repair or
replacement.
• If the unit is damaged by the customer, repair or replacement is the responsibility of the
customer.
• If the unit is damaged by the installer (if other than the customer), repair or replacement must be
made by arrangement between customer and installer.
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