Vent-A-Hood CWLH9248SS Installation Manual

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Read and Save These Instructions

All Hoods Must Be Installed By A Qualied Installer

INSTALLATION INSTRUCTIONS

CWLH9 WALL MOUNT HOOD

Read All Instructions Thoroughly Before Beginning Installation

WARNING - TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK,

OR INJURY TO PERSONS, OBSERVE THE FOLLOWING:

A. Installation work and electrical wiring must be done by qualied person(s)

in accordance with all applicable codes and standards, including re­rated construction. Switch power off at service panel and lock the service
disconnecting means to prevent power from being switched on accidentally

during installation.

B. When cutting or drilling into wall or ceiling, do not damage electrical wiring

and other hidden utilities.

C. Ducted fans must always be vented to the outdoors.

D. Sufcient air is needed for proper combustion and exhausting of gases

through the ue (chimney) of fuel burning equipment to prevent back
drafting. Follow the heating equipment manufacturer’s guideline and
safety standards such as those published by the National Fire Protection
Association (NFPA), and the American Society for Heating, Refrigeration
and Air Conditioning Engineers (ASHRAE), and local code authorities.

E. ASHRAE residential ventilation standard 62.2 limits exhaust fans (total) to

a maximum of 15 CFM per 100 square feet of occupiable space, unless a
back drafting test is performed or make-up air is provided. Consult a local
HVAC engineer for make-up air evaluation.

WARNING - TO REDUCE THE RISK OF FIRE, USE ONLY METAL

DUCTWORK

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Ducting Do’s and Don’ts

NEVER restrict the duct size. 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). When combining ducts together, the square inch area must reect the total

square inch area of the ducts being combined. Using Vent-A-Hood transitions (back page) will

ensure proper efciency.

Blower Duct Size Sq. Inch Area Vent-A-Hood Transition

Single (B100) 6” round or equivalent 28” N/A
Dual (B200) 8” round or equivalent 50” N/A
Single and Dual (B100 & B200) 10” round or equivalent 79” VP562 (Optional)
Two Dual (Two B200s) 12” round or equivalent 113” VP563 (Optional)

Do not use exible or corrugated duct. This type of duct will restrict airow and reduce
performance. Only use smooth, galvanized, metal duct. Observe local codes regarding special

duct requirements and placement of duct against combustibles. 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. Using Vent-A-Hood roof jacks or wall louvers (back page) will

ensure proper efciency. Airow must not be restricted at the end of the duct run. Do not use

screen wire or spring-loaded doors on wall louvers or roof jacks. Do not terminate venting into

an attic or chimney. Where possible, seal joints with duct tape. The hood must be ducted to the

outdoors without restrictions.

YES

NO

Smooth Duct

Flexible Duct

Smooth Gradual Turn

Sharp Angled Turns

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Proper Combining

of Two Ducts

Improper Combining

of Two Ducts

Installation Details

1) Read all instructions thoroughly before beginning installation. Note: These instructions apply to standard hoods only.
Custom hoods may require additional specication consideration.

2) When installing a CWLH9 wall mount hood, it is recommended that the bottom edge of the hood be located no more
than 27” above the cooking surface. Exceeding recommended mounting height may compromise performance.

Shown with duct cover installed (sold separately).

3) Select the appropriate installation method. Method 1 allows the hood and duct cover to be installed together as a
single unit. The nal duct connection is made at the ceiling as the hood is attached to the wall. Method 2 allows the
duct cover to be slid into place after the hood is attached to the wall. Caution must be taken when using this method
to prevent scratching the top of the hood or the ceiling.

4) IF THE HOOD IS TO BE “BACK VENTED”, PROCEED DIRECTLY TO STEP 5.

Consult the connection diagrams (on next page) for further details on exhaust outlet placement.

Method 1: Install the duct(s) from the outside of the home to the ceiling over the exhaust outlet(s) on the hood. The

end of the duct(s) should extend 1” below the ceiling.

Method 2: Install the duct(s) from the outside of the home down to the location of the exhaust outlet(s) on the top of

the hood allowing room for the transition (if applicable). If a transition is used, install duct down to the
location of the transition outlet plus 1”. This will allow the transition to engage 1” inside of duct.

Use duct tape to seal all joints. A complete listing of available Vent-A-Hood ducting materials is provided on the back

page of this instruction sheet.

Transition heights are as follows:

Single Blower (B100): 6” round duct will connect directly to the top of the hood.

Dual Blower (B200): 8” round duct will connect directly to the top of the hood.

Single and Dual Blower (B100 & B200): 6” round duct will connect directly to the top of the hood; 8” round will

connect directly to the top of the hood. Optional 10” round combination
transition (VP562, sold separately) is 17 1/2” tall.

Two Dual Blowers (Two B200s): Two 8” rounds connect directly to the top of the hood. Optional 12”

round combination transition (VP563, sold separately) is 16 1/2” tall.

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