Vent-A-Hood BH458PSLDSS User Manual

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Page 2L108 0817A

Ducting Do’s and Don’ts

YES

Smooth Duct

Smooth Gradual Turn

Proper Combining

of Two Ducts

Flexible Duct

Sharp Angled Turns

Improper Combining

of Two Ducts

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 single blower unit (B100) requires 6” round duct or equivalent (28 square inches), and the dual

blower unit (B200) requires 8” round duct or equivalent (50 square inches).

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

Single (B100) 6" round or equivalent 28 sq. in. N/A

Dual (B200) 8" round or equivalent 50 sq. in. N/A

Single and Dual (B100 & B200) 10" round or equivalent 79 sq. in. VP562 (Optional)

Two Duals (Two B200s) 12" round or equivalent 113 sq. in. VP563 (Optional)

Ducting Requirements

• NEVER reduce the duct size.

• Whencombiningductstogether,thesquareinchareamustreectthetotalsquareinchareaofthe

ducts being combined.

• 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.

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Vent-A-Hood BH458PSLDSS