Vent-a-Hood CWLH9 Installation Instructions Manual

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All Hoods Must Be Installed By A Qualified 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

qualified person(s) in accordance with all applicable codes and
standards, including fire-rated 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. Sufficient air is needed for proper combustion and exhausting

of gases through the flue (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.

WARNING

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

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(Rev. 04/07)

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

reflect the total square inch area of the ducts being combined. Using

Vent-A-Hood transitions (back page) will ensure proper efficiency.

Blower

Single (B100)
Dual (B200)
Single and Dual (B100 & B200)

Two Dual (Two B200s)

Duct Size Sq. Inch Area

6" round or equivalent 28"
8" round or equivalent 50"

10" round or equivalent 79"
12" round or equivalent 113"

Vent-A-Hood Transition

N/A
N/A

VP562 (Optional)
VP563 (Optional)

Do not use flexible or corrugated duct. This type of duct will restrict air flow 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 duct diameter by one inch for every ten feet of
duct. A 90 degree elbow is equivalent to 5 feet of duct. Using Vent-A-Hood roof jacks or

wall louvers (back page) will ensure proper efficiency. Air must not be restricted at the end
of duct run. Do not use screen wire or spring loaded doors on wall louvers or roof jacks.

Do not terminate vent into an attic or chimney. Where possible, seal joints with duct tape.
The hood must be ducted unrestricted to the outdoors.

NO

II

Smooth Duct Smooth Gradual Turn

Flexible Duct

Sharp Angled Turns

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(Rev. 04/07)

Proper Combining of

Two Ducts

Improper Combining

of Two Ducts

1)

Installation Details

Read all instructions thoroughly before beginning installation.

2)

3)

When installing the CWLH9, it is recommended that the bottom edge of the hood be located 27" from the

countertop. Exceeding recommended mounting height may compromise performance.

Duct _ I

Cover "1

27"

Shown with duct cover installed (sold separately).

Select an installation method. Method 1 allows the hood and duct cover to be installed together as a single unit.
The final 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:

Method 2:

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) :

Dual Blower (B200) :

Single and Dual Blower (B100 & B200):

Pre.install the duct from the outside of the home to the ceiling over the exhaust outlet of the
hood. The end of the duct should extend 1" below the ceiling.

Pre-install the duct from the outside of the home down to the location of the exhaust outlet

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.

6" round duct will connect directly to the top of the hood.

8" round duct will connect directly to the top of the hood.

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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(Rev. 04/07)