installation instructions

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Ducting Do’s and Don’ts

YES

Smooth Duct

Smooth Gradual Turn

Flexible Duct

Sharp Angled Turns

General Requirements

• Observe local codes regarding special duct requirements and placement of duct against combustibles.

• UsingVent-A-Hoodtransitions(backpage)willensurepropere󰀩ciency.

• UsingVent-A-Hoodroofjacksorwalllouvers(backpage)willensurepropere󰀩ciency.

• Where possible, seal joints with duct tape.

• The hood must be ducted to the outdoors without restrictions.

Blower Requirements

• The island dual blower unit (T200) requires 8” round duct or equivalent (50 square inches), and the

island cluster blower unit (T400) requires 12” round duct or equivalent (113 square inches).

Blower Combined Duct Dize Sq. Inch Area Vent-A-Hood Transition

Island Dual (T200) 8" round or equivalent 50 sq. in. VP565 (Included)

Island Cluster (T400) 12" round or equivalent 113 sq. in. VP564 (Included)

Ducting Requirements

• NEVER reduce the duct size.

• Donotuseexibleorcorrugatedduct.Thistypeofductwillrestrictairowandreduceperformance.

• Onlyusesmooth,galvanized,metalduct.

• Make the duct run as short and as straight as possible with as few turns as possible.

• Avoid sharp-angled turns. Instead, use smooth, gradual turns such as adjustable elbows or 45 degree

angled turns.

• Forductrunsover20feet,increasetheductdiameterbyoneinchforeverytenfeetofduct.

• A 90 degree elbow is equal to 5 feet of duct.

Termination Requirements

• Airowmustnotberestrictedattheendoftheductrun.

• A wall louver or roof jack is required for each duct run.

• Everywalllouverorroofjackmustincludeagravitydampertopreventbackdrafts.

• Do not use screen wire or spring-loaded doors on wall louvers or roof jacks.

• Donotterminateventingintoanatticorchimney.