TRADE WIND I32302RC Series Insert Style Range Hood Liner Installation Guide

TRADE WIND I32302RC Series Insert Style Range Hood Liner

Specifications

• Model Numbers: I32302RC, I32303RC, I32362RC, I32363RC, I32366RC
• Width: 28 inches
• Color: Stainless Steel (S/S)
• Blower: 3-speed internal blower
• CFM: 290 (I32302RC), 390 (I32303RC, I32363RC), 600 (I32366RC)
• Features: LED lights, Baffle filters, Remote control, Duct collar, Electronic touch control

FAQs

• Q: What should I do if there is a fire in my kitchen?
  • A: If the fire is small and contained, ensure you have a Class ABC extinguisher, call the fire department, and fight the fire with your back to an exit.
• Q: Can I use a solid-state speed control device with this product?
  • A: No, do not use this unit with any solid-state speed control device to prevent damage.

MODELS

MODEL| FRONT TO BACK| WIDTH| 3-SPEED INTERNAL BLOWER| CFM
---|---|---|---|---
I32302RC| 10 ½”| 28 ⅜”| √| 290
I32303RC| 10 ½”| 28 ⅜”| √| 390
I32362RC| 10 ½”| 34 ⅜”| √| 290
I32363RC| 10 ½”| 34 ⅜”| √| 390
I32366RC| 10 ½”| 34 ⅜”| √| 600

ATTENTION: PLEASE REMOVE THE RIGHTS IDEBAFFLE FILTER TO LOCATE YOUR NEW REMOTE CONTROL. 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 insert.
• Owner: Please keep Installation Instructions for the local electrical inspector’s use and future reference.
• WARNINGS: This must be followed carefully to avoid personal injury.
• IMPORTANT: This must be followed carefully to avoid damage and 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 the unit, switch the power off at the service panel, lock the 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.
  • 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. Boilovers cause smoking and greasy spillovers that may ignite. Heat oils slowly in low or medium settings.
• b) Always turn the 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 the 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 GREASE FIRE, OBSERVE THE FOLLOWING:

• a) Never leave surface units unattended at high settings. Boilovers cause smoking and greasy spillovers that may ignite. Heat oils slowly in low or medium settings.
• b) Always turn the 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 the 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 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 dishcloths 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 a qualified technician for the 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 the turning radius as large and as smooth as possible.
3. The ducting must be airtight. Use a minimum of 2 sheet metal screws at every duct joint. Then, seal the duct joint with 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, ELECTRICAL SHOCK, OR INJURY TO PERSONS OBSERVE THE FOLLOWING:

• a) Installation work and electrical wiring must be done by a qualified person(s) per all applicable codesand 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) the American Society for Heating, Refrigeration and Air Conditioning Engineers (ASHRAE), and the local code authorities.
• c) When cutting or drilling into a 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.
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, attics, crawl spaces, or garages.

TO ACCESS THE INSTALLATION INSTRUCTIONS FOR YOUR TRADE-WIND® PRODUCT, PLEASE SCAN THE QR CODE:

IMPORTANT: CUT-OUT INFORMATION Cabinets or hood cut-outs should be at least 1/8” larger than the outside dimensions

MODEL| FRONT TO BACK| WIDTH| COLOR| 3-SPEED
INTERNAL BLOWER| CFM| LIGHTS| FILTERS| CONTROL| COLLAR| CONTROL
---|---|---|---|---|---|---|---|---|---|---
I32302RC| 10 ½”| 28 ⅜”| S/S| √| 290| 1| √| √| 6″| √
I32303RC| 10 ½”| 28 ⅜”| S/S| √| 390| 1| √| √| 7″| √
I32362RC| 10 ½”| 34 ⅜”| S/S| √| 290| 1| √| √| 6″| √
I32363RC| 10 ½”| 34 ⅜”| S/S| √| 390| 1| √| √| 7″| √
I32366RC| 10 ½”| 34 ⅜”| S/S| √| 600| 1| √| √| 8″| √

PLANNING THE INSTALLATION

• TRADE-WIND® Indoor Series Inserts are designed for installation inside custom hood canopies. Proper installation of the insert 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 insert, two installers are recommended. 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 insert inside your custom canopy. Failure to do so could distort and damage the insert and void the warranty.
• 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 the safe and efficient operation of the hood. Always observe local building codes.

SECURING THE insert

TILE BACKSPLASHES

IMPORTANT: Inserts 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 insert 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 LABELS.
• Because the TRADE-WIND® Indoor Series Insert was designed for various wood hood applications, no mounting holes have been pre-drilled. This allows the insert to be attached in almost 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 insert—three screws along the back (top or back side panel) and three screws on the front top, immediately next to the light bar wall or behind the removable light bar. Where possible, the screw holes should be drilled into the top of the insert (instead of the sides or back). This will help prevent distorting the insert walls in situations where the wood frame is not properly sized to the insert.
• Models with internal motors should also have at least one screw centered and securely in place on each end (side panel) of the insert because of the added weight.
• Neatly measure and mark (left to right and top to bottom) and drill screw holes through the insert as required to match the wood backing. It is easier to drill holes from the outside in, by setting the insert on its face (on cardboard) and drilling from the backside.
• Secure the insert by driving screws (by others) tightly into the wood frame. Use washers where necessary.
• When removing the filters, be careful not to scratch the insert by placing the filters, screws, drill bits, or drill on the insert’s face. For visual instructions on removing the filters for mounting and other insert questions, check out our YouTube Channel:
  https://www.youtube.com/channel/UCwVIbi_9hbuIATTYvz43oBA.

CONNECTING TO THE VENT PIPE

The I3200 Indoor Insert Series 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.

ELECTRICAL CONNECTION

• IMPORTANT: COPY THIS PAGE TO YOUR ELECTRICAL INSTALLER.
• 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 whenelectrical 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 the latest revision) and local codes and ordinances. A copy of this standard may be obtained from: the 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. Always observe local building codes. Always use a dedicated circuit.
• CAUTION: The neutral wire (usually white) must connect to the same neutral wire that comes from the electrical panel.

WIRING DETAILS

• BLACK 120 VOLT AC FROM ELECTRICAL PANEL (USUALLY BLACK) TO insert
• WHITE NEUTRAL FROM ELECTRICAL PANEL (USUALLY WHITE) TO insert
• GREEN GROUND FROM ELECTRICAL PANEL (USUALLY GREEN) TO insert

HOUSE ELECTRICAL PANEL

MODELS:

• I32302RC
• I32303RC
• I32362RC
• I32363RC
• I32366RC

DIAGRAM 1: ALL MODELS WITH FACTORY-INSTALLED INTERNAL MOTOR/BLOWER.

USE AND CARE

• CAUTION: The edges of the stainless steel are extremely sharp. To ensure safety, wear gloves when handling all parts.
• WARNING: Do not operate the blower/ventilator system without the filters in place, or with dirty, grease-laden filters.
• 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, and pull the filter towards the front of the hood until the back of the filter drops down.
  • Grasping the filter, remove it from the front by now pulling it out of the front channel. For visual instructions on how to remove the filters, visit our YouTube Channel: https://www.youtube.com/channel/UCwVIbi_9hbuIATTYvz43oBA.
• 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 the blower, touch the illuminated speed button again. The electronic light control comes on when touched, touch again for the light off.
• ENERGY SAVING TIPS:
  • Eliminate air currents in the insert 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
  • Minimize the amount of liquid used to cook food. Select cookware of proper size, material, and construction for the cooking task being performed.
• CARE AND 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.
  • The best results will be achieved by cleaning soiled components as soon as possible. Filters must be cleaned regularly.
  • We recommend washing filters by placing them in the bottom rack of a dishwasher. Locate the holes on the sides of the filter. Put the filter in the dishwasher with holes facing up, so the detergent can enter the filters. Dry the filters completely before using them 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 the Polish manufacturer’s instructions.
• LED LIGHT BULBS:
  • TRADE-WIND® Inserts are designed for MR16/GU10 LED light bulbs. They can be purchased at most home or grocery stores.
  • The bulbs provided with the unit are 3. 5 watts, 350 lumens, and 3000K (warm white color temperature).
  • To remove the light bulbs, press your palm into the lens face of the bulb and turn a ¼ turn to the left.
  • The bulb should unlock from its socket, and pop out. If you need to get more leverage on the bulb, you can purchase a suction cup with a ring on it at your local hardware store.

EXPLAINING THE REMOTE

• The diagram to the left shows all the functions of the remote. Push the speed or light buttons once to turn on; push the same button a second time to turn off. You can use the “off” button to power off the lights and blower simultaneously.
• The “5-minute delay auto off” button can be pressed when the blower is on at any speed. The blue light behind the speed button will blink showing that this feature has been activated.
• It will continue to blink for 5 minutes and then the blower will shut off automatically.
• If you press the “5-minute delay auto off” button again the blinking on the speed button stops and the blower has returned to manual mode.
• If you would like to mount the remote to any surface near your range, Velcro pieces have been provided. Peel and stick one piece to the back of the remote, and the other to desired surface.
• If the battery in the remote needs replacing, use a CR2025 watch battery. These are very common and easy to find. To access it, look to the bottom end of the remote; push the release to the right, and slide the battery tray out.

RANGE OF REMOTE CONTROL

The infrared transmitter at the top of the remote must be pointed in the direction of the electronic control at the right front of your hood or insert. Range distance will vary depending on your installation, but see the diagram below for the approximate range area.

WARRANTY

TRADE – WIND ® VENTILATION PRODUCTS

What IS Covered:

• TRADE-WIND Manufacturing, LLC® warrants its TRADE-WIND® 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 Manufacturing, LLC®, 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 TRADEWIND ® Best Practices Guidelines.
• Product used other than for normal in-home use or products used outside of the United States and Canada.
• 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 reset the circuit breakers.
• Service calls to correct faulty installation, such as performance issues relating to improperly sized ducting or restrictive roof caps, are not covered and will, by default, be charged back to the Homeowner.
• Light bulbs are not covered under warranty.
• TRADE-WIND Manufacturing, LLC® 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® Ventilation Product, visit our website at: www.twusa.com and click on the warranty tab. Fill out the simple form providing the model number, serial number, date of purchase, and brief description of the problem. Proof of purchase will also be required.
• WARRANTY REVISED: JANUARY 1, 2023
• For more information, please contact your dealer or your TRADE-WIND® representative.

ADDENDUM TO INSTALLATION INSTRUCTIONS

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 hoods/liners should be installed by qualified technicians familiar with state and local building codes.
2. DUCT PIPE & FITTINGS (ELBOWS, TRANSITIONS, ROOF & WALL CAPS)
   • a. ) Use round or rectangular rigid metal ducts only. Where possible, use a round duct as it creates the least amount of static pressure. IT IS RECOMMENDED THAT YOU DO NOT USE FLEX DUCT
   • b.) All duct sections and fittings, 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 airflow, elbows, and pipe-size transition fittings should not be directly connected. Where possible, always include at least 15 inches of straight pipe between fittings.
3. DUCT PIPE & FITTING SIZES (See Duct Sizing Chart and Area Calculations section on page 3 for more details)
   • IMPORTANT: The required duct size is indicated by the size of the duct collar on the hood or liner.
   • IMPORTANT: No portion of any length of duct pipe or fitting should be smaller than the duct collar of the hood/liner. 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.

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 390 CFM hood/liner 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 hood/liner 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 hood/liner 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.

DAMPERS

IMPORTANT: DO NOT USE SCREWS TO ATTACH ANY TYPE OF DAMPER AS THE SCREWS MAY BLOCK THE DAMPERBLADES.
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 the Roof Caps and Wall Caps section for more details. 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 includes screws protruding into the blade’s path, overspray of paint, plaster, and insulation. If using a rectangular duct, be sure that all four sides of the duct are on the outside of the damper’s duct collar or frame. On hood/liner 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.

• a.) 390 CFM Models 390 CFM models have either a 3. 25” x 10” rectangular metal damper attached directly to the hood/liner or a 7″ duct collar that requires a 7″ damper (sold separately).
• b.) 600 – 1200 CFM Models 600-1200 CFM models have either an 8″ or 10″ round duct collar that requires the use of a damper with thecorresponding dimension (sold separately).
  • 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), which may result in rattling, vibration, and air buffeting noises, as well as inadequate ventilation.
  • In-line 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 hood/liner. In-line dampers mustbe installed so that the exhaust air flow will open the butterfly blades.
  • 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.
  • 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.
  • 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.

ROOF CAPS & 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 hood/liner’s duct collar. If any section of the roof cap or wall cap is smaller than the hood/liner’s duct collar, the entire ventilation system will lose performance 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 exit point is equal to or greater than the duct collar of the hood/liner. 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.

ROOF CAP DRAWING: RECOMMENDED & NOT RECOMMENDED

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 the hood/liner. All ducting should be attached to avoid any possible duct vibration from being transferred to the house’s framework.

DUCT SIZING CHART & AREA CALCULATION

DUCT COLLAR TYPES & SIZES| DUCT TYPE REQUIRED| DUCT SIZE (IN SQ. IN. )| MINIMUM ROOFCAP OR WALLCAP OPENING SIZE
---|---|---|---
6″ DIAMETER, ROUND| 6″ ROUND METAL DUCT| 28. 3″| 28. 3″
7″ DIAMETER, ROUND| 7″ ROUND METAL DUCT| 38. 5″| 38. 5″
8″ DIAMETER, ROUND| 8″ ROUND METAL DUCT| 50. 25″| 50. 25″
10″ DIAMETER, ROUND| 10″ ROUND METAL DUCT| 78. 5″| 78. 5″
3. 25″ x 10″ RECTANGULAR| 3. 25″ x 10″ RECTANGULAR METAL DUCT| 32. 5″| 32. 5″

ROUND DUCT

RECTANGULAR DUCT OR WALL/ROOF CAP

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.

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