CopperSmith CSPI-30 User manual

Revised 05/15/20 1
Professional Liner Inserts
395 CFM Code Compliant
*These models connect to an In-Line, Roof or
wall-Mounted Remote Blower. The blower used
determines the CFM.
Before beginning installation, please thoroughly read and become familiar with these instructions. Installation and
service must be completed by a qualified installer. Failure to properly install this product may void the warranty.
Installer: Please leave installation instructions with the range hood liner.
Owner: Please keep installation instructions for local electrical inspector’s use and for future reference.
WARNINGS: Must be followed carefully to avoid personal injury.
IMPORTANT: Must be followed carefully to avoid damage or incorrect installation.
TIPS: Contains helpful information to facilitate installation.
READ AND SAVE THESE INSTRUCTIONS
WARNING! TO REDUCE THE RISK OF FIRE, ELECTRICAL SHOCK, OR INJURY TO
PERSONS OBSERVE THE FOLLOWING:
a) Use this unit only in the manner intended by the manufacturer. If you have any questions, please contact the
manufacturer at the address or telephone number listed in the warranty.
b) Before servicing or cleaning unit, switch power off at service panel, lock service panel, and lock the service
disconnection 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 service panel.
c) To reduce the risk of fire or electric shock, do not use this fan with any solid-state speed control device.
Model Width CFM
Type of
Motor &
Blower
CSPI-30 28 3/8” * Remote
CSPI-36 34 3/8” * Remote
CSPI-42 40 3/8” * Remote
CSPI-48 46 3/8” * Remote
CSPI-54 52 3/8” * Remote
CSPI-60 60 3/8” * Remote
CSPI-302 28 3/8” 290 Internal
CSPI-362 34 3/8” 290 Internal
CSPI-422 40 3/8” 290 Internal
CSPI-482 46 3/8” 290 Internal
CSPI-303 28 3/8” 390 Internal
CSPI-363 34 3/8” 390 Internal
CSPI-423 40 3/8” 390 Internal
CSPI-306 28 3/8” 600 Internal
CSPI-366 34 3/8” 600 Internal
CSPI-426 40 3/8” 600 Internal
CSPI-486 46 3/8” 600 Internal
CSPI-4212 40 3/8” 1200 Internal
CSPI-4812 46 3/8” 1200 Internal
CSPI-5412 52 3/8” 1200 Internal
CSPI-6012 60 3/8” 1200 Internal
INSTALLATION INSTRUCTIONS &
USE & CARE GUIDE
CopperSmith® Professional Liner Inserts

Revised 05/15/20 2
CAUTION
-- For general ventilating use only. Do not use to exhaust hazardous or explosive materials and vapors.
WARNING – TO REDUCE THE RISK OF A RANGE TOP GREASE FIRE:
a) Never leave surface units unattended at high settings. Boil overs cause smoking and greasy
spillovers that may ignite. Heat oils slowly on low or medium settings.
b) Always turn hood ON when cooking at high heat or when flambeing food (i.e. Crepes Suzette,
Cherries Jubilee, Peppercorn Beef Flambe’).
c) Clean ventilating fans frequently. Grease should not be allowed to accumulate on fan or filter.
d) Use proper pan size. Always use cookware appropriate for the size of the surface element.
WARNING! TO REDUCE THE RISK OF INJURY TO PERSONS IN THE EVENT OF A
RANGE TOP GREASE FIRE, OBSERVE THE FOLLOWING:
a) SMOTHER FLAMES with a close-fitting lid, cookie sheet, or metal tray, then turn off the burner. BE
CAREFUL
TO PREVENT BURNS. If the flames do not go out immediately, EVACUATE AND CALL THE FIRE
DEPARTMENT.
b) NEVER PICK UP A FLAMING PAN — YOU MAY BE BURNED.
c) DO NOT USE WATER, including wet dishclothes or towels. A violent steam explosion will result.
d) Use an extinguisher ONLY if:
1. You know you have a Class ABC extinguisher and you already know how to operate it.
2. The fire is small and contained in the area where it started.
3. The fire department is being called.
4. You can fight the fire with your back to an exit.
Recommendations:
1. Consult a licensed ventilation contractor or qualified technician for proper installation of exhaust
ducting. Locate the cooking area for minimum cross drafts-away from doors and windows, when
possible.
2. Ducts must be of adequate size and duct runs should be as short as possible. Where turns are necessary,
keep turning radius as large and as smooth as possible.
3. The ducting must be air tight. Use a minimum of 2 sheet metal screws at every duct joint. Then,
seal the duct joints with high quality duct tape.
4. Do not use this unit with any solid-state speed control device.
5. This unit must be grounded.
INSTALLATION INSTRUCTIONS
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 codes and standards.
b) Sufficient air is needed for proper combustion and exhausting of gasses through the flue (chimney)
of fuel burning equipment to prevent back drafting. Follow the heating equipment manufacturer's
guidelines 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 the local code authorities.
c) When cutting or drilling into wall or ceiling, do not damage electrical wiring and other hidden utilities.
d) Ducted fans must always be vented to the outdoors.

Revised 05/15/20 3
WARNING – TO REDUCE THE RISK OF FIRE, USE ONLY METAL DUCTWORK.
CAUTION – To reduce the risk of fire and to properly exhaust air, be sure to duct air outside –
Do not vent exhaust air into spaces within walls, ceilings, cabinets or into attics, crawl spaces, or garages.
CAUTION – To reduce the risk of fire and electric shock, install this (range hood) only with
Remote Blower
models rated maximum 5 amps.
CONTENTS:
Part 1 - Planning The Installation Part 2 - Securing The Liner
Part 3 - Use & Care Part 4 - Electrical Connection (Give copy of these 2 pages to electrician.)
PART 1 Planning the Installation
CopperSmith® Liners are designed for installation inside custom hood canopies. Proper installation of the liner is
directly related to the material from which the custom canopy is constructed. A qualified person must complete
the installation of this unit. Because of the large size and weight of this hood / liner, two installers are recommend-
ed. Plan the installation so that all minimum clearances are met or exceeded. Dimensions shown provide minimum
clearances, unless otherwise specified. Important: You must provide structural framing and tight backing in the
areas in which you are securing the liner inside your custom canopy. Failure to do so could distort and damage the
liner and void the warranty.
It is important to locate the remote blower in a preferably easily accessible location. This will ensure that any
service that may be required in the future may be performed on the blower without damaging the range hood, walls
or ceiling.
For best and quietest performance with In-Line Blower installations, the blower should be installed in the attic, near
or slightly beyond the mid-point of the duct system. In installations requiring the blower be in a chase or wood-type
hood over the range (e.g., no attic above the kitchen), the duct silencer will not be as effective in absorbing motor
noise. In addition, there will likely be motor sound transmitted through the walls of the chase, bypassing the duct
silencer.
Given the high performance of CopperSmith® Remote Blowers, it is highly recommended that the blower NOT
be attached directly to the liner or in a chase immediately above the liner unless a CopperSmith® brand duct
silencer is installed between the blower and liner and neoprene lined FC Clamps are used. FC Clamps are
available from CopperSmith®. Ask for model numbers CS-C6 (6”), CS-C8 (8”) or CS-C10 (10”), 2 per box.
CopperSmith® Ventilators, Duct Silencers, Dampers, and Ducting
CopperSmith® Liners (non-internal motor models) are also designed for use with “in-line” and “remote-mount”
ventilators. When planning for installations using these products, please refer to the Installation Instructions
provided with the ventilator. CopperSmith® Duct Silencers are available from your CopperSmith® dealer. When
planning for installation using a duct silencer, please refer to the Installation Instructions provided with the duct
silencer.
Given that most installations are different, a back-draft damper is not provided with this unit. CopperSmith®
back draft dampers are also available from your CopperSmith® dealer. Always install ventilation products with
an approved wall or roof cap. Duct performance is improved by using round, smooth metal duct work instead of
rectangular. If multiple elbows must be used, ensure that there is a minimum of 24” of straight duct between any
two elbows. Avoid “S” or back to back configurations caused by adjacent elbows. Do not rely on duct tape alone
to seal duct joints. Use sheet metal screws as required to support the duct.
WARNING! For maximum ventilation performance, the bottom of the hood or liner should be 30 -
36
inches (76.2 - 91.4 cm) above the cooking surface (minimum is 24”). This would typically result in the
bottom of the hood being 66 - 72 inches (167.6 - 182.9 cm) above the floor. These dimensions provide
for safe and efficient operation of the hood. Always observe local building codes.

Revised 05/15/20 4
Important Cut-Out Information
Cabinet or hood cutouts should be at least 1/8” larger than the following outside dimensions.
Models Available (by Width)
Pic CFM 28 3/8” 34 3/8” 40 3/8” 46 3/8” 52 3/8” 58 3/8” Sones Control Blower
N/A
Variable In-Line or Remote
Mount Blower
290 CSPI-302 CSPI-362 CSPI-422 CSPI-482 - - 5 3-Speed Internal Motor
390
-
3-Speed
Internal Motor
600
7.5
3-Speed Internal Motor
1200
8.5
3-Speed
*Drawings A, C, & D are also available in 22” depth order CSPI
-
22 MODELS
A
Notes:
1. Center of electrical access is 2 1/2” from front & 4” from side of liner. Connection
access is behind filters.
2. Vent is 8” (models 30 & 36) or 10” (42, 48, 54, & 60). Damper is not included.
3. Length and width cutouts should be 1/8” larger than above dimensions.
4. Liner only
bB
Notes:
1. Center of electrical access is 2 1/2” from front & 4” from side of liner. Connection
access is behind filters.
2. Vent is 6” (290 CFM models) or 7” (390 CFM models) centered left to right.
Damper is not included.
3. Length and width cutouts should be 1/8” larger than above dimensions.
4.
290 or 390
CFM
c
Notes:
1. Center of electrical access is 2 1/2” from front and 4” from side of liner. Connection
access is behind filters.
2. Damper is not included.
3. Length and width cutouts should be 1/8” larger than above dimensions.
4. 610 CFM
Notes:
1. Center of electrical access is 2 1/2” from front and 4” from side of liner. Connection
access is behind filters.
2. Order Vent Transition accessory (Part # 3BL - 35 - 482). Damper is not included.
3. Length and width cutouts should be 1/8” larger than above dimensions.
4. 1250 CFM
5. *22” depth units DO NOT require the vent
transition on top.*
Two Internal Motors
CSPI
-
303
CSPI
-
306
CSPI
-
363
CSPI
-
366
CSPI
-
423
CSPI
-
426
A
B
b
C
D
CSPI
-
4212
CSPI
-
4812
CSPI
-
5412
CSPI
-
6012
CSPI
-
30
CSPI
-
36
CSPI
-
42
CSPI
-
48
CSPI
-
54
CSPI
-
60
D
7
CSPI
-
486
-

Revised 05/15/20 5
PART 2 Securing the Liner
TILE BACKSPLASHES
IMPORTANT: Liners installed immediately above the top edge of tile backsplashes thicker than 3/4” should be
installed slightly forward — not flush with the back wall. The back filter bracket of the liner is 1” deep and tile
installations thicker than this will prevent the filters from being removable.
MOUNTING HOLES
NOTE: DRILLING THROUGH STAINLESS STEEL REQUIRES A TITANIUM BIT. BE CAREFUL NOT TO DRILL
THROUGH FILTER BRACKETS, ELECTRICAL COMPONENTS OR UL LABEL.
Because the CopperSmith® Liner was designed for various hood applications, no mounting holes have been pre-
drilled. This allows the liner to be attached in most any area of the canopy that has a wood frame support, e.g., the
back, sides or top. We recommend at least six equally spaced screws per liner— three screws along the back (top
or back side panel) and three screws on the front top, immediately next to the light bar (instead of the sides or
back). This will help prevent distorting the liner walls in situations where the wood frame is wall or behind the
removable light bar. Where possible, the screw holes should be drilled into the top of the liner not properly sized to
the liner. Models with internal motors should also have at least one screw centered and securely in place
on each end (side panel) of the liner because of the added weight.
Neatly measure and mark (left to right and top to bottom) and drill screw holes through the liner as required to
match the wood backing. It is easier to drill holes from the outside in, by setting the liner on its face (on cardboard)
and drilling from the back side. Secure the liner by driving screws (by others) tightly into the wood frame. Use
washers where necessary. When removing the filters, be careful not to scratch the liner by placing the filters,
screws, drill bits or drill on the liner’s face.
CONNECTING TO THE VENT PIPE
The liner comes with a metal start collar welded in place. Attach the start collar to the duct with at least three
equally spaced screws. Also apply duct tape, preferably the metal type. Some installations (where the outside of
this portion of the duct is not accessible) will require the metal tape be applied on the inside of the duct. For better
access to these installations, the center bracket on the 42” liner model is removable. Be careful not to scratch the
liner when removing/reinstalling the bracket.
PART 3 Use and Care
WARNING!
Do NOT operate the blower / ventilator system without the filters in place, or with dirty, grease laden filters.
OPERATING CONTROLS:
Always activate the ventilator when using cooking appliances. For best performance, turn on the blower a few
minutes before starting to cook to establish an airflow pattern within the room. Adjust the fan speed by turning the
knob. To turn off blower, turn knob to off position. For controlling the lighting, turn the other knob.
If the model has electronic touch control, touch the button that corresponds to the desired speed. To turn off
blower, touch the illuminated speed button again. The light control when touched comes on; touch again for light
off.

Revised 05/15/20 6
ENERGY SAVING TIPS:
Eliminate air currents in the liner vicinity by shutting nearby windows and doors, turning off ceiling fans and adjusting
the adjacent heating and air conditioning outlets if necessary. Place your largest pans on the rear burners whenever
possible. Clean filters and grease laden surfaces often to improve efficiency. Always use lids on cookware to retain
heat and moisture. Minimize the amount of liquid used to cook food. Select cookware of proper size, material and
construction for the cooking task being performed.
CARE & CLEANING:
Proper cleaning is necessary to maintain performance and appearance, while also ensuring safe operation. The frequency
of cleaning should be according to the type and amount of cooking. Best results will be achieved by cleaning soiled
components as soon as possible. Filters must be cleaned regularly.
Filter Removal: Each filter has two aluminum cylindrical knobs, one towards the rear and one towards the front. The
front & rear knobs are only for grasping and are permanently connected to the filter. To remove the filter, grasp the
front & rear knobs, push the filter backwards towards the rear of the hood until the front of the filter drops down.
Grasping the filter, remove it from the rear by now pulling it forward.
The filters may be cleaned by hand washing in hot water using a mild detergent solution or by placing in an automatic
dishwasher. Place filters with side holes facing vertical so detergent enters top and grease exits bottom.
CAUTION: Most common scrubber type pads will scratch the liner. If a commercially available
stainless steel cleaner is used, it is important to read the labels for chlorine compounds. Chlorine is a corrosive
substance. If these compounds are present, rinse thoroughly and dry with a soft lint-free cloth. Follow polish
manufacturer’s instructions. Always wipe stainless steel surfaces with the grain. Never wipe across the grain.
After cleaning, reinstall the filters carefully.
LED LIGHT BULBS:
CopperSmith® liners are designed for MR16/GU10 LED flood light bulbs. The bulbs provided with the unit are 3.5
watt, 350 lumen, and 3000K (color temperature). They can be purchased at most home or grocery stores, e.g.,
Lowe’s, McCoy’s, Menards, Ace True Value and Home Depot.
PART 4 Electrical Connection
IMPORTANT: Copy this page and the next pages for your electrical installer.
For unit amperage see diagram 1 (page 7)
WARNING! Ensure that the power supply is disconnected before proceeding. Verify that the power supply
matches the ratings found on the appliance data label before proceeding. The complete appliance must be properly
grounded at all times when electrical power is applied. Do not ground the appliance with the neutral (white) house
supply wire. A separate ground wire must be utilized. Failure to complete electrical connections properly may result in
damaged or non-functional systems. Follow instructions carefully to ensure proper installation.
It is the owner’s responsibility to ensure that a qualified person performs the electrical connection of this appliance.
The electrical installation, including minimum supply wire size, must comply with the National Electric Code
ANSI/NFPA 70-1990 (or latest revision) and local codes and ordinances. A copy of this standard may be obtained
from: National Fire Protection Association, 1 Batterymarch Park, Quincy, Massachusetts 02269-9101.
INSTRUCTIONS: A 15 to 20 amp electrical service is recommended for proper electrical supply. Before determining,
calculate amp ratings based on the product label found on the liner and the ventilator. Always observe local building
codes. Always use a dedicated circuit. Line load is calculated by adding the amperage of the LED lights to the rated
amperage of the ventilator (either in-line or roof top). If the ventilator is rated in watts rather than amps, divide the watts
by 120 and this will give you the amperage rating. The CopperSmith® liner is supplied with a 6.0 amp variable speed
fan control. Make sure the rated amperage on the ventilator does not exceed 6.0 amps (or 700 watts).

Revised 05/15/20 7
Models:
CSPI-302
CSPI-362
CSPI-442
CSPI-482
CSPI-303
CSPI-363
CSPI-423
CSPI-306
CSPI-366
CSPI-426
CSPI-486
CSPI-4212
CSPI-4812
CSPI-5412
CSPI-6012
AMPS:
House Electrical
Panel
Liner
CAUTION: The neutral wire (usually white) for the blower/motor must connect to the same neutral wire that
comes from the electrical panel to the liner. It is recommended to run a white neutral wire from the liner’s white neutral
wire along the same path as the red wire from the liner’s variable speed control to the blower/motor.
Variable - Speed Control Wiring Details (For remote blowers)
Black 120 volt AC from electrical panel (usually black) to liner
White Neutral from electrical panel (white) to liner
Green Ground from electrical panel (usually green) to liner
Red
120 volt AC variable control from liner to 120 volt AC line of variable speed ventilator
CAUTION: Do Not connect this wire to a 3-speed blower
IMPORTANT: CopperSmith® does not pay warranty claims for damage to liners or components connected to other
brand blowers inconsistent with these Installation Instructions. Always consult the switch manufacturer's installation
instructions when substituting control switches. The warranty may be voided if any unauthorized service, alterations
or repairs are made to the product.
Wiring Diagrams
Diagram 1: All Models with Factory Installed Internal Motor/Blower
Diagram 2: Models Connected to Variable Speed Blowers
Green
White
120V Black
BLK WHT GRN
IMPORTANT: Copy this page and previous page to your electrical installer.
RED
WHT
GRN
Liner
BLK
Green, Ground
Ventilator
White (N)
120V Black
(L)
120V Red
Green
House Electrical
Panel
Models:
CSPI-30
CSPI-36
CSPI-42
CSPI-48
CSPI-54
CSPI-60
2.7
2.7
2.7
2.7
2.7
2.7
2.7
2.7
2.7
2.7
2.7
5.2
5.2
5.2
5.2

Revised 05/15/20 8
W A R R A N T Y
Professional Series Kitchen Ventilation Products
What is Covered
World CopperSmith® warrants its CopperSmith® Professional Series kitchen ventilation products to the
original user, to be free of defects in materials and workmanship for three (3) years from the date of
purchase.
World CopperSmith®, at its option, will repair or replace the complete unit or any defective component without
charge. This warranty may be voided if any unauthorized service, alterations or repairs are made to the product.
What is Not Covered
 Normal maintenance and service of any product that has been subject to misuse, negligence, accident
or installation inconsistent with the recommended installation instructions.
 Product used other than for normal in-home use or products used outside of the United States.
Damage to the product caused by accident, fire, flood or other acts of God.
 Service calls to educate the customer in the proper use and care of the product, correct faulty
installation, change fuses or reset breakers.
World CopperSmith® disclaims and excludes any liability for implied warranties or for incidental or consequential
damages wherever permitted by law. There are no implied warranties of merchantability or fitness for a particular
use or purpose. This warranty gives you specific legal rights and you may also have other rights, which vary from
state to state.
#
For Service
If you need service, contact Customer Service at the address or phone number below. Provide the model number,
serial number, part identification, and details of the problem. Proof of purchase must be provided.
Warranty Rev. 05/15/20
World CopperSmith® has a policy of continuous improvements and reserves the right to modify (at anytime and
without notice) any or all of its products, features, designs, components and specifications.For exact dimensions,
see the Installation Instructions included with each product. Some features may be slightly different than shown
on product literature.
For more information, please contact your dealer or CopperSmith®
Phone: [phone]
Email: [e-mail]
Website: worldcoppersmith.com
C US LISTE

Revised 05/15/20 9
IMPORTANT: Problems caused by improper installations are not covered by the manufacturer’s warranty.
IMPORTANT: Undersized and improperly installed duct pipe and/or other ventilation components will cause
excessive static pressure (air resistance), that may result in rattling, vibration and air buffeting
noises, as well as inadequate ventilation.
1. Building Codes
Kitchen hood ventilators should be installed by qualified technicians familiar with state and local building codes.
2. Duct Pipe and Fittings (Elbows, Transitions, Roof & Wall Caps)
a. Use round or rectangular rigid metal duct only. Where possible, use round duct as it creates the least amount
of static pressure. DO NOT use flex duct.
b. All duct sections and fittings (EXCEPT DAMPERS, per section 4), should overlap and be connected with at
least 3 - 4 equally spaced screws and wrapped tightly with 2 - 3 layers of aluminum foil metal duct tape. This
type of duct tape is more durable than traditional cloth duct tape. DO NOT use butt joints.
c. For best air flow, elbows and pipe size transition fittings should not be directly connected to one another.
Where possible, always include at least 15 inches of straight pipe between fittings.
3. Duct Pipe and Fitting Sizes. (See Duct Sizing Chart and Area Calculations section for more detail)
IMPORTANT: DO NOT use either of the following duct pipe sizes or fitting sizes for any kitchen hood ventilator
installations:
- 3.25” x 10” rectangular x 6” round transitions
- 6” x 7” linear transitions
IMPORTANT: No portion of any length of duct pipe or fitting should be smaller than the discharge port of the
ventilator. This is very important because any type of restriction anywhere in the ventilation
system will cause increased static pressure (air resistance), that may result in rattling, vibration
and air buffeting noises, as well as inadequate ventilation.
Example: For ventilator models with 3.25” x 10” discharge ports, no part of the roof cap or wall cap’s air path
should be smaller than 3.25” x 10” (32.5 square inches) or 7” round (38.5 square inches).
See Roof Caps and Wall Caps section for more detail.
Exception: For some short duct runs inside walls framed with 2 x 4 studs, it is a common industry practice to
transition a 7” round duct to a 3.25” x 10” rectangular duct. If space allows, it is best to use a 3.25” x 14” rectangular
duct with a 3.25” x 14” x 7” transition.
Best Practices
Venting Installation Instructions for
Range Hoods and Wood Hood Liners
(All Models)
—Addendum to Installation Instructions—

Revised 05/15/20 10
Duct Pipe and Fitting Sizes (Continued)
Duct Runs – Length
a. Configure the ventilation duct run to be as short and as direct to the outside as possible. Minimize the
number of elbows and transition fittings used. Complex or long runs should be reviewed by a qualified
installer.
b. No portion of the ducting should be run so that the exhaust air flows downward. Since exhaust heat
rises, forcing the air to flow downward will cause increased static pressure. As previously mentioned,
improperly installed duct pipe will cause excessive static pressure (air resistance), that may result in
rattling, vibration and air buffeting noises, as well as inadequate ventilation.
c. Duct runs for 290 & 390 CFM ventilator models should not exceed 20 linear feet with two 90-degree
elbows (or four 45-degree elbows), a damper and a roof or wall cap. Longer runs or additional elbows
will result in decreased ventilation performance. Each 90-degree elbow is the equivalent of 8 linear
feet of duct pipe; each 45-degree elbow is equivalent to 4 linear feet of duct pipe.
d. Duct runs for 600 & 1200 CFM ventilator models should not exceed 35 linear feet with two 90-degree
elbows and two 45-degree elbows, a damper and a roof or wall cap. Longer runs or additional elbows
will result in decreased ventilation performance. Each 90-degree elbow is the equivalent of 6 linear
feet of duct pipe; each 45-degree elbow is equivalent to 3 linear feet of duct pipe.
e. Always run ventilator ducts to the outdoors. DO NOT terminate a duct into an attic, basement, garage,
crawl space under a house, a chimney, other ducting or an enclosed room.
4. Dampers
IMPORTANT: DO NOT USE SCREWS TO ATTACH ANY TYPE OF DAMPER AS THE SCREWS MAY BLOCK
THE DAMPER BLADES.
IMPORTANT: DO NOT USE MORE THAN ONE DAMPER IN THE VENTILATION SYSTEM. NOTE: Many styles
of roof caps and wall caps have built-in dampers. See Roof Caps and Wall Caps section for more
detail.
Always use carefully crafted, tightly wrapped aluminum foil metal duct tape on all connections and physically
view and test the damper blades to make certain they are opening and closing correctly. Make sure that the
damper blades do not touch the duct walls and that there is no debris blocking the free movement of the
damper mechanism. Common things to look for include screws protruding into the blade’s path, overspray of
paint, plaster and insulation. If using rectangular duct, be sure that all four sides of the duct are on the outside
of the damper’s start collar or frame.

Revised 05/15/20 11
a. 290 & 390 CFM Models
DO NOT USE SCREWS TO ATTACH THE DUCT TO THE DAMPER FRAME AS THE SCREWS MAY
BLOCK THE DAMPER BLADE. ALWAYS use aluminum foil metal duct tape on all connections and
physically view the damper blade to make certain it is operating correctly. On ventilator installations
designed to recirculate the exhaust air back into the kitchen, be sure to remove the aluminum damper
blade before attaching the duct to the damper frame.
b. 600 & 1200 CFM Ventilator Models
Damper in Roof Cap or Wall Cap
In ventilation systems utilizing a roof cap or wall cap with a built-in damper, do not install an additional
in-line damper. Two dampers are unnecessary and will cause increased static pressure (air resistance),
that may result in rattling, vibration and air buffeting noises, as well as inadequate ventilation.
In-line Damper (for ventilation systems utilizing a roof cap or wall cap without a built-in damper)
In cold weather areas, installing an “in-line” damper may be the preferred type of installation. This is
because in-line dampers installed just above the perimeter of the heated space (the ceiling) will reduce
the amount of cold air traveling down the duct into the heated space and into the kitchen through the
ventilator.
In-line dampers must be installed so that the exhaust air flow will open the butterfly blades.
For horizontal duct runs, the in-line damper must be installed so that the hinge between the two
butterfly blades is vertical — the hinge pin must point up and down. Otherwise, because of gravity, the
damper’s blades will not close and the damper will not prevent backdrafts.
For vertical duct runs, the in-line damper’s hinge will be horizontal (sideways), which is correct for
vertical duct runs. Gravity will help close the damper blades after each use.
For upward slanted duct runs, the in-line damper’s hinge must point to the top and bottom sides of the
duct. In his position, gravity will help close the damper blades after each use. Otherwise, because of
gravity, the damper’s blades will not close and the damper will not prevent backdrafts.
c. Roof Caps and Wall Caps
The roof cap or wall cap is the termination point of the venting system that allows the exhaust air to exit to the
outdoors. All sections of this fitting must have an equal or greater air path area than the ventilator’s discharge
port. If any section of the roof cap or wall cap is smaller than the ventilator’s discharge port, the entire
ventilation system will lose efficiency and the restriction will cause increased static pressure.
IMPORTANT: Even though the intake side of the roof cap or wall cap may be properly sized, roof caps or wall
caps with built-in dampers must be made so that when the damper is fully open, the actual open area of the
final air path is equal to or greater than the discharge port of the ventilator. Any undersized portion of a roof
cap or wall cap will cause excessive static pressure that may result in rattling, vibration and air buffeting noises,
as well as inadequate ventilation.
Roof caps and wall caps must have an integral bird screen.
d. Attaching Duct to House Framework
The ventilation system should be attached to the framework in such a manner that the weight of the duct and
fittings is supported with no stress on the duct joints, fittings or on the ventilator. All ducting should be attached
so as to avoid any possible duct vibration from being transferred to the house’s framework.

Revised 05/15/20 12
ROUND DUCT
Radius x Radius x 3.1416 = Area (Sq. Inches)
The “radius” is one half the diameter of a round duct
e.g., ½ of a 10” round duct is 5”. 3.1416 is “Pi”, the
“constant” used when calculating the area of a circle.
Width x Depth = Area (Sq. Inches)
e. Hoods with Optional Top or Back Venting
Several range hood models provide the option of venting the exhaust air out the top or back side of the range
hood. On some models, this is accomplished by redirecting the motor/blower unit to exhaust through the top,
back or the recirculation position. On other models, the duct pipe is attached directly to the start collar which
can be attached to the top side or back side of the hood. For more details on this aspect of the installation, see
the detailed installation instructions packaged with each unit.
IMPORTANT: On models with multiple venting ports, the open holes/slots around the unused venting port(s)
MUST BE SEALED with aluminum foil metal duct tape. Otherwise, exhaust air and smoke will be vented
through the unused vent knockout’s holes/slots. On models featuring the recirculation option, if this option is
NOT used, the vent port inside the hood should also be taped over with aluminum foil metal duct tape.
UNUSED PORTS SHOULD BE TAPED BEFORE THE RANGE HOOD IS MOUNTED TO THE WALL OR
CABINET.
f. Liners Using Optional Vent Transition Accessory
On installations using the optional vent transition accessory to transition to 10” round duct, all bottom edges of
the transition should be taped to the liner with 2 – 3 layers of aluminum foil metal duct tape.
g. Duct Sizing Chart and Area Calculations
Ventilator Discharge Port
Types & Sizes
Duct Type Required Duct Size
(in Square Inches)
Minimum Discharge Size
of Roofcap or Wallcap
Outside Opening
6” Diameter, Round 28.3” 6” Round Metal Duct 28.3” 28.3”
7” Diameter, Round 38.5” 7” Round Metal Duct 38.5” 38.5”
8” Diameter, Round 50.25” 8” Round Metal Duct or
6” x 9” Rectangular Metal Duct
50.25”
54”
50.25”
54”
10” Diameter, Round 78.5” 10” Round Metal Duct 78.5” 78.5”
3.25” x 10” Rectangular 32.5” 3.25” x 10” Rectangular Metal Duct 32.5” 32.5”
Calculating Square Inches of Various Duct Sizes & Types
Roof cap examples. Choose by using the chart above and measuring the area of the air exit
opening. (Figure 1 is smallest option, should only ever be used with 3.25” x 10” duct).
Fig. 1 Fig. 2
Opening 100 sq.in.
Diameter 9 3/4"