Trade-wind P32303RC User manual

Item No. 0BH-00-002 Revised 09/19/2017 Copyright (C) 2017 Proverbs 22:29 Page 1
INSTALLATION INSTRUCTIONS &
USE & CARE GUIDE
Trade-Wind® P3200 Series Range Hoods
P3200 Series
!"#$%&
Width(in.)
CFM
P32303RC
30”
390
P32363RC
36”
390
P32423RC
42”
390
P32306RC
30”
600
P32366RC
36”
600
P32426RC
42”
600
P32487RC
48”
780
CONTENTS:
Part 1 - Planning the Installation
Part 2 - Electrical Connection
Part 3 - Direction of Vent and
Securing The Hood
Part 4 - Use & Care
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 owner.
Owner:
Please keep Installation Instructions for local electrical inspector’s use and for future reference.
WARNINGS: Instructions must be followed carefully to avoid personal injury.
IMPORTANT: Must be followed carefully to avoid damage or incorrect installation.
TIPS: Contain 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 and lock service panel and/or 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.
CAUTION -- For general ventilating use only. Do not use to exhaust hazardous or explosive materials
a and vapors.

Item No. 0BH-00-002 Revised 09/19/2017 Copyright (C) 2017 Proverbs 22:29 Page 2
WARNING – TO REDUCE THE RISK OF A RANGE TOP GREASE FIRE:
a) Never leave surface units unattended at high settings. Boilovers 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.
WARNING -- TO REDUCE THE RISK OF FIRE, USE ONLY METAL DUCTWORK.

Item No. 0BH-00-002 Revised 09/19/2017 Copyright (C) 2017 Proverbs 22:29 Page 3
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 with in walls or ceilings or into attics, crawl spaces, or garages.
CAUTION – To reduce the risk of fire and electric shock, install this range hood only with Integral
Blower manufactured by Trade-Wind®.
PART 1 Planning the Installation
CAUTION:
1. For general ventilating use only. Do not use to exhaust hazardous or explosive materials and vapors.
2. To reduce the risk of fire and to properly exhaust air, the hood must be exhausted to outside air. Never
exhaust into a wall, an attic or a concealed area in the building. This can create a potential hazard.
4. Consult a licensed ventilation contractor or qualified technician for proper installation of exhaust ducting.
5. Locate the cooking area for minimum cross drafts—away from doors and windows, when possible.
6. 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.
7. 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.
8. Only use ductwork constructed of materials deemed acceptable by state, municipal and local codes.
9. Plan the installation so that all minimum clearances are met or exceeded. Dimensions shown provide minimum
clearances, unless otherwise specified.
IMPORTANT: If the Trade-Wind® hood is installed as a liner for a wood hood or custom hood, proper
installation of the hood as a liner is directly related to the material from which the custom canopy is
constructed. 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 hood and void the
warranty.
Dimensions:
Dimensions
Models
Width
CFM
Duct
Opening
P29306RC
30”
600
8”
P29366RC
36”
600
8”
P29426RC
42”
600
8”
P29487RC
48”
780
10”
Dimensions
Models
Width
CFM
Duct
Opening
P29303RC
30”
390
7”
P29363RC
36”
390
7”
P29423RC
42”
390
7”
Duct Cover
(included for ceilings from
8' to 10')
Duct Cover
(sold separately for ceilings
from 10' to 12')
Optional Duct Covers
-PDC3230- EXT KIT for P3230
-PDC3236- EXT KIT for P3236
-PDC3242- EXT KIT for P3242
-PDC3248- EXT KIT for P3248
*Please note that measurements provided
reflect the bottom of the hood being 30”
above the stove.

Item No. 0BH-00-002 Revised 09/19/2017 Copyright (C) 2017 Proverbs 22:29 Page 4
WARNING!
Following Are Manufacturer’s Suggestions. Always Observe Local Building Codes.
Hoods installed in custom canopies constructed of combustible materials should be installed with the combustible
material structure a minimum of 36” above the cooking surface. Hoods installed in custom canopies constructed of
non-combustible materials, should be installed with the non-combustible material structure a minimum of 30” above
the cooking surface. Follow all instructions regarding minimum safe clearances and installation location. Failure to
do so may result in a safety hazard or fire. To reduce the risk of fire use only metal ductwork.
PART 2 Electrical Connection
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 02169-7471
INSTRUCTIONS: A 15 to 20 amp electrical service is recommended for proper electrical supply. Always
observe local building codes. Always use a dedicated circuit.
Wire connections: (See Diagram Below) There are 3 wires on the front panel that require connection.
BLACK
120 VAC from electrical panel (usually black)
WHITE
Neutral from electrical panel (white)
GREEN
Ground from electrical panel (usually green)
CAUTION: The neutral wire (white) must only be connected to the white neutral wire coming in from the
electrical panel.
PART 3 Direction of Vent and Securing the Hood
MOUNTING HOLES: Because the Trade-Wind® 3200 Series range hood was designed for all
applications, no mounting holes have been pre-drilled. This allows the hood (or liner) to be attached in the areas of
the cabinet or wood hood canopy that have proper wood frame support. The hood should be attached to the wood
framing through the top, side, or back. Remove the filters. Mark and drill screw holes through the hood as
required. Secure the hood by driving screws (provided by others) through the screw holes.
Hood
House Electrical
Panel
Green
White
(N)
120V Black (L)

Item No. 0BH-00-002 Revised 09/19/2017 Copyright (C) 2017 Proverbs 22:29 Page 5
NOTE: DRILLING THROUGH STAINLESS STEEL REQUIRES TITANIUM DRILL BITS. BE CAREFUL NOT TO
DRILL THROUGH THE UL LABEL OR INTO THE HOOD’S ELECTRICAL COMPONENTS.
PART 4 Use and Care
FILTER REMOVAL
Each filter has two aluminum cylindrical knobs, one towards the rear and one towards the front. The front knob is
actually a screw that holds the filter in place. The rear knob is only for grasping and is permanently connected to
the filter. To remove the filter, simply unscrew the front knob counter clockwise until the knob comes out of the
filter. Grasping the rear knob, 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.
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. To use the electronic touch control,
touch the button that corresponds to the desired speed. To turn off blower, touch the illuminated speed button
again or the illuminated blower off control button. The electronic light control when touched comes on high; touch
again for night light setting, touch again for light off.
WARNING!
Do NOT operate the blower / ventilator system without the filters in place, or with dirty, grease laden filters.
ENERGY SAVING TIPS:
Do not operate the blower at a speed higher than necessary to remove the cooking exhaust. Running at excessive
speeds removes more air from the inside of the house that must be replaced by outside air. This may be especially
costly when your home’s heating or air conditioning system is in operation. Turn off the unit once the smoke and
cooking odors have been eliminated. 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.
The filters may be cleaned by hand washing in hot water using a mild detergent solution, or by placing them in a
dishwasher. Locate holes on the sides of the filter. Put filter in dishwasher with holes facing up so detergent can
enter filters. Dry the filters completely before using again. Rinse and dry with a soft lint-free cloth. Always wipe
stainless steel surfaces with the grain. Never wipe across the grain. After cleaning, reinstall the filters carefully.
>> Most common scrubber type pads will scratch the hood.
CAUTION: If a commercially available stainless steel cleaner is used, it is important to read the labels for
chlorine compounds. Chlorine is a corrosive substance, DO NOT USE. Follow polish manufacturer’s instructions.
LED LIGHT BULBS:
Trade-Wind® liners are designed for MR16/GU10 LED flood light bulbs. They can be purchased at most home or
grocery stores. The bulbs provided with the unit are 3.5 watt, 350 lumen, and 3000K (color temperature).

Item No. 0BH-00-002 Revised 09/19/2017 Copyright (C) 2017 Proverbs 22:29 Page 6
W A R R A N T Y
Kitchen Ventilation Products
What IS Covered
Trade-Wind® warrants its Trade-Wind® 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.
Trade-Wind® 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 Trade-Wind® Installation Instructions
and Trade-Wind® Best Practices Guidelines.
• Product(s) 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, change fuses, or to
reset the circuit breakers.
• Service calls to correct faulty installation, such as, performance issues relating to improperly sized
ducting or restrictive roof caps is not covered and will by default be charged back to the Homeowner.
Trade-Wind® 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 on your Trade-Wind® Kitchen Ventilation or Exhaust Ventilators
contact our Customer Service at the Website, physical address, or phone number listed below.
Please provide the model number, part identification, and/or serial number along with details of the problem.
Proof of purchase may be required.
Warranty Revised 09/19/2017
Universal Metal Industries, Inc. has a policy of continuous improvements and reserves the right to modify (at any time 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 Trade-Wind® Representative
800 West Grant Street, Phoenix, AZ 85007
800 875-3654 Phone [phone] Fax
602 251-3654 Phone [phone] Fax
twphx.com trade-windonline.com umiphx.com

Item No. 0BH-00-002 Revised 09/19/2017 Copyright (C) 2017 Proverbs 22:29 Page 7
'()*#+&
'$+,&-().,/.$+
&
Venting'Installation'Instructions'for'
Range'Hoods'and'Wood'Hood'Liners'
(All'Models)'
'
—Addendum(to(Installation(Instructions—
0!-1234536&&Problems'caused'by'improper'installations'are'not'covered'by'the'manufacturer’s'warranty.
&&&
0!-1234536&&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.'
'
78 '9/%#/*:&;"#$+&&&<&&&Kitchen'Hood'Ventilators'should'be'installed'by'qualified'technicians'familiar''
'''''''''''with'state'and'local'building'codes.'
'
=8 >9.,&-/?$&)*#&@/,,/*:+&AB%C"D+E&3()*+/,/"*+E&2""F&G&H)%%&;)?+I'
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.'
'
J8 >9.,&-/?$&)*#&@/,,/*:&K/L$+8&&(See'>9.,&K/L/*:&;M)(,&)*#&4($)&;)%.9%),/"*+'Section'for'more'detail)&
&
0!-1234536&&DO'NOT'use'either'of'the'following'duct'pipe'sizes'or'fitting'sizes'for'any'kitchen'hood'
ventilator'installations:'
-''6”'round'duct'pipe'
-''3.25”'x'10”'rectangular'x'6”'round'transitions'
-''6”'x'7”'linear'transitions'
'
0!-1234536&&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'2""F&;)?+&)*#&
H)%%&;)?+'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.'
&
&

Item No. 0BH-00-002 Revised 09/19/2017 Copyright (C) 2017 Proverbs 22:29 Page 8
>9.,&-/?$&)*#&@/,,/*:&K/L$+&(Continued)&
>9.,&29*+&N&O$*:,M&
a. Configure'the'ventilation'duct'run'to'be'as'short'and'as'direct'to'the'outside'as'possible.''Minimize'
the'number'of'elbows'and'transition'fittings'used.''Complex'or'long'runs'should'be'reviewed'by'a'
qualified'installer.'
'
b. No'portion'of'the'ducting'should'be'run'so'that'the'exhaust'air'flows'downward.''Since'exhaust'heat'
rises,'forcing'the'air'to'flow'downward'will'cause'increased'static'pressure.''As'previously'mentioned,'
improperly'installed'duct'pipe'will'cause'excessive'static'pressure'(air'resistance),'that'may'result'in'
rattling,'vibration'and'air'buffeting'noises,'as'well'as'inadequate'ventilation.'
'
c. Duct'runs'for'390CFM'ventilator'models'should'not'exceed'20'linear'feet'with'two'90-degree'elbows'
(or'four'45-degree'elbows),'a'damper'and'a'roof'or'wall'cap.''Longer'runs'or'additional'elbows'will'
result'in'decreased'ventilation'performance.'''Each'90-degree'elbow'is'the'equivalent'of'8'linear'feet'
of'duct'pipe;'each'45-degree'elbow'is'equivalent'to'4'linear'feet'of'duct'pipe.'
'
d. Always'run'ventilator'ducts'to'the'outdoors.''DO'NOT'terminate'a'duct'into'an'attic,'basement,'
garage,'crawl'space'under'a'house,'a'chimney,'other'ducting'or'an'enclosed'room.'
'
'
P8 >)Q?$(+&
0!-1234536''DO'NOT'USE'SCREWS'TO'ATTACH'ANY'TYPE'OF'DAMPER'AS'THE'SCREWS'MAY'BLOCK'THE'
DAMPER'BLADES.'
'
0!-1234536''DO'NOT'USE'MORE'THAN'ONE'DAMPER'IN'THE'VENTILATION'SYSTEM.''513B:''Many'styles'of'
roof'caps'and'wall'caps'have'built-in'dampers.''See'2""F&;)?+&)*#&H)%%&;)?+'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.'
&
JRS;@!&!"#$%+&
390CFM'models'have'a'7"'round'duct.'''
DO'NOT'USE'SCREWS'TO'ATTACH'THE'DUCT'TO'THE'DAMPER'FRAME'AS'THE'SCREWS'MAY'BLOCK'
THE'DAMPER'BLADE.''ALWAYS'use'Aluminum'Foil'Metal'Duct'Tape'on'all'connections'and'physically'
view'the'damper'blade'to'make'certain'it'is'operating'correctly.''On'ventilator'installations'designed'
to'recirculate'the'exhaust'air'back'into'the'kitchen,'be'sure'to'remove'the'aluminum'damper'blade'
before'attaching'the'duct'to'the'damper'frame.'
'
>)Q?$(&/*&2""F&;)?&"(&H)%%&;)?&
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.'
&
0*<%/*$&>)Q?$('(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.'

Item No. 0BH-00-002 Revised 09/19/2017 Copyright (C) 2017 Proverbs 22:29 Page 9
In-line'dampers'must'be'installed'so'that'the'exhaust'air'flow'will'open'the'butterfly'blades.'''
For'M"(/L"*,)%&#9.,&(9*+,'the'in-line'damper'must'be'installed'so'that'the'hinge'between'the'two'
butterfly'blades'is'T$(,/.)%—the'hinge'pin'must'point'up'and'down.''Otherwise,'because'of'gravity,'
the'damper’s'blades'will'not'close'and'the'damper'will'not'prevent'backdrafts.'''
'
For'T$(,/.)%&#9.,&(9*+,'the'in-line'damper’s'hinge'will'be'M"(/L"*,)%'(sideways),'which'is'correct'for'
vertical'duct'runs.''Gravity'will'help'close'the'damper'blades'after'each'use.''
'
For'9?D)(#&+%)*,$#&#9.,&(9*+,'the'in-line'damper’s'hinge'must'point'to'the'top'and'bottom'sides'of'
the'duct.''In'his'position,'gravity'will'help'close'the'damper'blades'after'each'use.''Otherwise,'because'
of'gravity,'the'damper’s'blades'will'not'close'and'the'damper'will'not'prevent'backdrafts.'''
'
U8 2""F&;)?+&)*#&H)%%&;)?+&
The'roof'cap'or'wall'cap'is'the'termination'point'of'the'venting'system'that'allows'the'exhaust'air'to'exit'to'
the'outdoors.''All'sections'of'this'fitting'must'have'an'equal'or'greater'air'path'area'than'the'ventilator’s'
discharge'port.'''If'any'section'of'the'roof'cap'or'wall'cap'is'smaller'than'the'ventilator’s'discharge'port,'the'
entire'ventilation'system'will'lose'efficiency'and'the'restriction'will'cause'increased'static'pressure.'
'
0!-1234536''Even'though'the'intake'side'of'the'roof'cap'or'wall'cap'may'be'properly'sized,'roof'caps'or'wall'
caps'with'built-in'dampers'must'be'made'so'that'when'the'damper'is'fully'open,'the'actual'open'area'of'the'
final'air'path'is'equal'to'or'greater'than'the'discharge'port'of'the'ventilator.''Any'undersized'portion'of'a'roof'
cap'or'wall'cap'will'cause'excessive'static'pressure'that'may'result'in'rattling,'vibration'and'air'buffeting'
noises,'as'well'as'inadequate'ventilation.'''
VVV2""F&.)?+&)*#&D)%%&.)?+&Q9+,&M)T$&)*&/*,$:()%&C/(#&+.($$*8&
W8 4,,).M/*:&>9.,&,"&X"9+$&@()Q$D"(Y&
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.&
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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' '
21^5>&>^;3&
&
2B;345_^O42&>^;3&
Radius'
x'
Radius'
x'
3.1416'
='
Area'(Sq.'Inches)'
'
Width'
x'
Depth'
='
Area'(Sq.'Inches)'
'
x'
'
x'
'
'
='
'
'
'
''x'
'
''='
'
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.'
'
'
'
'