Dundas Jafine's 4 in. aluminum tension clamps are ideal for use with flexible or semi-rigid ducts. These clamps open and close with pressure. No tool required.

• Ideal for use with flexible or semi-rigid ducts
• Aluminum construction
• No tools necessary
• Easy operation

Heavy Gauge 4 in. Pipe is used to vent boilers, furnaces and hot water heaters. Available in a variety of common lengths, diameters and gauges to help make your next HVAC project a success. A simple snap lock design and sturdy galvanized steel construction combine for a quick and secure installation that you can rely on.

• Easy-to-install snap lock design
• Crimped end with a stop-bead for a secure interlocking fit
• Sturdy 26-Gauge, galvanized steel construction
• Always seal seams with building code approved sealant or duct tape
• Always insulate ductwork for greater system efficiency and comfort

Heavy Gauge Adjustable Elbows are used to make angular turns in round pipe to vent boilers, furnaces and hot water heaters where allowed by code. They have a sturdy galvanized steel construction and are simple to adjust. They are also crimped on one end to easily fit into a pipe or other fitting of the same diameter.

• Used to make angular or gradual turns in runs of pipe
• Adjustable to any angle through 90 degree
• 28-Gauge, galvanized steel construction
• Crimped end for easy installation
• Always seal seams with building code approved sealant or duct tape
• Always insulate ductwork for greater system efficiency and comfort

The Master Flow 6 in. Goose Neck Vent in Black can be used to cover exhaust pipes extending through your roof or for attic ventilation. This vent is designed to be used on 6 in. round ducts. It's made of zinc-coated galvanized steel for durability and reliability. This vent features a heavy-duty screen which helps protect against small animals from entering your home through the vent. The black finish helps this vent blend into your home's rooftop.

• Designed for 6 in. round ducts
• Ideal for pitched roofs and being used for attic ventilation or to cover exhaust pipes extending through roof
• Seal seams with code approved mastic, sealant or duct tape
• Install using appropriate roofing nails (not included)
• Heavy-duty screen helps protect against small animals from entering
• Ample flashing for added leak protection
• Black finish helps blend into rooftops
• Always seal flashing with approved roof sealant

Master Flow Drive Cleats and S Cleats are used to join sections of rectangular duct and stack duct in. HVAC systems. These cleats are sleeves of galvanize steel that help to securely assemble the top and bottom (S) and left and right sides (Drive) of rectangular duct runs. S cleats are used to connect the long side of the duct, while Drive cleats are used to connect the short side.

• Always seal seams with code approved mastic or sealant (or duct tape)
• Always insulate ductwork for greater system efficiency and comfort
• S cleats secure bare edges of rectangular duct
• Insulate ductwork to promote system efficiency

Duct strapping is ideal for use in hanging hot air supply and cold air returns to framing members. Founded in 1971, Diversitech Corporation is North Americas largest manufacturer of equipment pads and a leading manufacturer and supplier of components and related products for multiple industries, including: HVACR, electrical, consumer hardware retail, electrical utility, automotive retail and pool and spa channel. Diversitechs mission for its wholesaler partners is to simplify their work. We do this by offering more than 200 product categories all from a single manufacturing/supplier source to create product availability and supply chain cost advantages for our customers in every market we serve. We also leverage best-in-class customer service to react quickly and professionally to every customer request.

• Galvanized steel construction resists corrosion
• Solid strapping, easy to drill or nail
• Can accept fasteners at any point along the length of the strapping
• Convenient cardboard dispenser allows for easy transport

These Worm Clamps are ideal for attaching aluminum ducts to other aluminum products, including elbows and pipe. Easily adjustable with the turn of a screwdriver, these clamps can be used with all venting applications. A heavy-duty galvanized steel construction ensures longevity through a variety of uses. For optimal performance, it is recommended to use a manual screwdriver to avoid over tightening and stripping the screw.

• Made of heavy duty galvanized steel
• Easily adjustable using a hex or flat head screwdriver
• Adjusts from 5-1/8 in. to 6-1/2 in.
• Can be used in all venting applications

The 4 in. x 6 ft. Heavy Duty Semi-Rigid Aluminum Duct with Collars is ideal when all aluminum duct is required x code in some gas and electric dryer applications. It can also be used for bathroom fan venting. This duct is totally noncombustible and has a maximum operating temperature of 435 degree F.

• Aluminum collars on both ends of the duct swivel making for easy attachment to the dryer exhaust port and exterior exhaust hood
• UL2158A listed and marked for safe dryer venting
• New manufacturing technology incorporated into the duct allows for easy rotation and therefore more durable handling of the duct by the contractor
• UL duct is thicker than the standard non-UL semi-rigid version that allows for a more robust installation

The Master Flow 5 in. Round Duct Cap, also called a tee-cap or clean-out plug, is constructed of galvanized steel for durability. The duct cap is used to terminate or block off a rectangular duct run in HVAC systems. It can be installed with sheet metal screws (sold separately) and is suitable for most HVAC applications.

• Use to cap off a round or rectangular duct run
• Install with sheet metal screws (not included)
• Fits most HVAC types for universal application
• Seal seams with code-approved mastic, sealant or duct tape (sold separately)

Master Flow 26-Gauge 90 Adjustable 8 in. Elbow is used to make turns in runs of round pipe and flexible duct through 90. It has a sturdy galvanized steel construction and is simple to adjust. It is also crimped on 1 end to easily fit into a pipe or other fitting of the same diameter. Ships in 90 position.

• Used to make angular or gradual turns in runs of pipe
• Adjustable to any angle through 90
• 26-Gauge, galvanized steel construction
• Always seal seams with building code approved sealant or duct tape (not included)
• Always insulate ductwork for greater system efficiency and comfort (not included)

The Master Flow 4 in. Starting Collar is suitable for most HVAC applications. It provides a transition from a flat surface like a plenum (made from metal, ductboard or insulated) to round pipe or insulated flexible duct. It can be used with ductboard, an internally lined or unlined plenum. This galvanized steel starting collar features extra-long tabs to fit most duct board thicknesses.

• Install with sheet metal screws (not included)
• Fits most HVAC types for universal application
• Can be used with an internally lined or unlined plenum
• Extra-long tabs to fit most ductboard thicknesses through 1-1/2 in. (or R-6 value)
• Seal seams with code-approved mastic, sealant or duct tape (sold separately)

Type B Gas Vent designed to the demands of the common category I appliance installation. Engineered to heat up rapidly and remain hot during the appliance operation to allow for minimal condensation. An innovative system for a lock tight connection called DuraLock.

• Use with natural gas and liquified propane (LP) category I appliances with a draft hood
• Designed to meet the rugged demand of the jobsite, with its inner wall recessed to eliminate damage in handling
• 1 in. clearance to combustibles in single and multi-family dwellings
• Innovative system for a lock tight connection called duralock

The Master Flow 6 in. Starting Collar is suitable for most HVAC applications. It provides a transition from a flat surface like a plenum (made from metal, ductboard or insulated) to round pipe or insulated flexible duct. It can be used with ductboard, an internally lined or unlined plenum. This galvanized steel starting collar features extra-long tabs to fit most duct board thicknesses.

• Install with sheet metal screws (not included)
• Fits most HVAC types for universal application
• Can be used with an internally lined or unlined plenum
• Extra-long tabs to fit most ductboard thicknesses through 1-1/2 in. (or R-6 value)
• Seal seams with code-approved mastic, sealant or duct tape (sold separately)

Double Wall Construction

• Non-Positional Locking System Makes Installation A Snap
• No Tools Required For Disassembly

Master Flow 4 in. Aluminum Elbow makes venting a boiler, furnace or hot water heater a snap, installing on an angle up to 90 via a crimped-end design that makes it easy to affix. The elbow fits roundest aluminum pipes with 4 in. Dia Ideal for use in high-heat applications. Ships in 90 position.

• Durable aluminum construction
• Designed to fit round piping so that you can vent boilers, furnaces and hot water heaters on an angle
• Light-weight, crimped-end design installs easily and provides a secure fit
• Seam seal using building code approved sealant or duct tape for a quick and easy finishing touch
• Fits most round aluminum pipes with 4 in. Dia
• Adjustable design allows use at angles up to 90
• For reliability in high-heat applications

Type B Gas Vent designed to the demands of the common category I appliance installation. Engineered to heat up rapidly and remain hot during the appliance operation to allow for minimal condensation. An innovative system for a lock tight connection called DuraLock.

• Use with natural gas and liquified propane (LP) category I appliances with a draft hood
• Adds 16.5 in. L to a 4 in. Dia installation
• Aluminum inner wall and galvalume outer wall construction that features a industry leading twist-lock design
• 1 in. clearance to combustibles in a single or multi-family dwelling applications

The Master Flow 6 in. Round Duct Cap, also called a tee-cap or clean-out plug, is constructed of galvanized steel for durability. The duct cap is used to terminate or block off a rectangular duct run in HVAC systems. It can be installed with sheet metal screws (sold separately) and is suitable for most HVAC applications.

• Use to cap off a round or rectangular duct run
• Install with sheet metal screws (not included)
• Fits most HVAC types for universal application
• Seal seams with code-approved mastic, sealant or duct tape (sold separately)

Type B Gas Vent designed to the demands of the common category I appliance installation. Engineered to heat up rapidly and remain hot during the appliance operation to allow for minimal condensation. An innovative system for a lock tight connection called DuraLock.

• Use with natural gas and liquified propane (LP) category I appliances with a draft hood
• Replacement tee cap for 6 in. Dia DuraVent B-vent
• Prevents flue gases from leaking out the 6 in. Dia b-vent tee
• Allows easy access to vent run for cleaning and inspection thru the b-vent tee

Type B Gas Vent designed to the demands of the common category I appliance installation. Engineered to heat up rapidly and remain hot during the appliance operation to allow for minimal condensation. An innovative system for a lock tight connection called DuraLock.

• Use with natural gas and liquified propane (LP) category I appliances with a draft hood
• Allows a 5 in. Dia B-vent run to be increased to 6 in. for added draft
• Aluminum inner wall and galvalume outer wall construction that features an industry leading twist-lock design
• 1 in. clearance to combustibles in a single or multi-family dwelling applications

This Master Flow 10 in. x 4 in. to 6 in. Universal Register Box creates a straight (in-line) transition from round pipe or insulated flexible duct to an air register or grille. It can be installed with sheet metal screws. It is suitable for most HVAC applications. This universal register box is made of galvanized steel.

• Creates a straight, in-line transition from an insulated flexible duct or round pipe to an air register or grille
• Installs with sheet-metal screws
• Insulate ductwork for system efficiency and comfort
• Seal seams with code-approved mastic, sealant or duct tape (not included)

The Master Flow 7 in. x 6 in. Round Reducer is made of galvanized steel. It features hemmed collar edges for enhanced strength and a secure fit. The reducer is used to transition from a 7 in. pipe to a 6 in. pipe in an HVAC system. It is suitable for most HVAC applications.

• Hemmed collar edges for an improved fit and increased strength
• Connects 7 in. pipe to 6 in. pipe in duct run
• Seal seams with code-approved mastic, sealant or duct tape (sold separately)
• Always insulate ductwork for greater system efficiency and comfort (insulation not included)

Type B Gas Vent designed to the demands of the common category I appliance installation. Engineered to heat up rapidly and remain hot during the appliance operation to allow for minimal condensation. An innovative system for a lock tight connection called DuraLock.

• Use with natural gas and liquified propane (LP) category I appliances with a draft hood
• Designed to meet the rugged demand of the jobsite, with its inner wall recessed to eliminate damage in handling
• 1 in. clearance to combustibles in single and multi-family dwellings
• Innovative system for a lock tight connection called duralock

Master Flow Standard 90Adjustable 4 in. Elbow is used to make turns in runs of round pipe and flexible duct through 90. It has a sturdy galvanized steel construction and is simple to adjust. It is also crimped on 1 end to easily fit into a pipe or other fitting of the same diameter. Ships in 90position.

• Used to make angular or gradual turns in runs of pipe
• Adjustable to any angle through 90
• 30-Gauge, galvanized steel construction
• Always seal seams with building code approved sealant or duct tape (not included)
• Always insulate ductwork for greater system efficiency and comfort (not included)

Used to vent two appliances together where codes allow. Heavy duty construction meets most building codes for single wall use. Crimped branch pipe in the direction of airflow.

• 26-Gauge steel construction
• "Y" branch allows air to flow easily
• Crimped in the direction of airflow
• Vent multiple appliances where code allows

Master Flow Standard 90 degree Adjustable 8 in. Elbow is used to make turns in runs of round pipe and flexible duct through 90 degree . It has a sturdy galvanized steel construction and is simple to adjust. It is also crimped on 1 end to easily fit into a pipe or other fitting of the same diameter. Ships in 90 degree position.

• Used to make angular or gradual turns in runs of pipe
• Adjustable to any angle through 90 degree
• 30-Gauge, galvanized steel construction
• Always seal seams with building code approved sealant or duct tape (not included)
• Always insulate ductwork for greater system efficiency and comfort (not included)

Use to vent condensing appliances. Includes 1 Locking Clamp. PolyPro is an engineered alternative for condensing gas appliances. Engineered for venting, it is easier and faster to install than PVC, saving the contractor time and money. Polypropylene has a higher operating temperature limit of 230 degree F/110 degree C (PVC is 149 degree F/65 degree C max and CPVC is 194 degree F/90 degree C). PolyPro is engineered with a condensation management system.

• PolyPro is a polypropylene vent pipe for use with ANSI category II and IV gas-burning appliances, including high efficiency water heaters, condensing boilers and warm air furnaces
• 0 in. clearance to combustibles for exhaust temperatures up to 194 degree F / 90 degree C and 0 in. clearance for vertical installations up to exhaust temperatures of 230 degree F / 110 degree C and 1/4 in. / 6mm clearance to combustibles for horizontal installations at exhaust temperatures up to 230 degree F / 110 degree C
• Check with appliance manufacturer, Intertek / ETL Listed to ULC-S636 Listed as a class IIA, IIB, and IIC vent system
• PolyPro is an environmentally safe and engineered alternative, for condensing gas appliances
• Engineered for venting, it is 100% recyclable, and contains no toxic or carcinogenic materials, chlorides, or heavy metals
• PolyPro does not release hazardous gases during combustion, and has been used safely throughout Europe for over 20 years
• PolyPro is engineered with a corrosion-free, condensation management system
• Rigid pipe constructed of 2.2 mm (minimum) thick PolyPro
• Easy to install lightweight, assembles quickly, can be disassembled for inspection or cut to desired length
• Gasketed joint system, no adhesives nor primers required, no curing times and no special training, no mess

The Master Flow 26 Gauge 7 in. x 6 in. Flat Reducer is made OG galvanized steel. Its short length makes it ideal for tight spaces. The reducer is used to transition from a 7 in. pipe to a 6 in. pipe system. It is suitable for most HVAC applications.

• 26-Gauge, galvanized steel construction for durability
• Connects 7 in. pipe to 6 in. pipe in duct run
• Connect using sheet metal screws (not included)
• Universal - not crimped
• Can be crimped as needed

The Master Flow 8 in. Round Duct Cap, also called a tee-cap or clean-out plug, is constructed of galvanized steel for durability. The duct cap is used to terminate or block off a round duct run in HVAC systems. It can be installed with sheet metal screws (sold separately) and is suitable for most HVAC applications.

• Use to cap off a round duct run
• Install with sheet metal screws (not included)
• Fits most HVAC types for universal application
• Seal seams with code-approved mastic, sealant or duct tape (sold separately)

The Master Flow 12 in. x 25 ft. Insulated Flexible Duct R6 Silver Jacket is used in standard Heating and Air Conditioning (HVAC) systems and some venting applications. The duct has R6 insulation which contains 33% more insulation than the standard R4.2 product. This additional insulation provides greater thermal efficiency to save energy. The product is also covered in a heavy duty, silver jacket for durability. The duct is ETL listed, meeting the UL181 standard.

• Flexible duct is convenient for use in multiple applications including heating and A/C systems and some venting
• Oversized core to connect quickly and easily to standard sheet metal fitting
• Galvanized core wire for greater corrosion resistance vs. non-galvanized wire
• Duct can be cut to length as needed
• Insulated duct features a maximum temperature rating of 200 degree F
• Always install per instructions and seal using approved mastic or sealant (or approved tape)

Double Wall Construction

• Non-Positional Locking System Makes Installation A Snap
• No Tools Required For Disassembly

Type B Gas Vent designed to the demands of the common category I appliance installation. Engineered to heat up rapidly and remain hot during the appliance operation to allow for minimal condensation. An innovative system for a lock tight connection called DuraLock.

• Use with natural gas and Liquified Propane (LP) category I appliances with a draft hood
• Directs rain away from the flashing to prevent water penetration in attic
• Apply 500 caulking around the edge of the storm collar and the b-vent to prevent water penetration
• Made from galvanized steel to prevent corrosion

Master Flow standard 90 degree Adjustable 6 in. Elbow is used to make turns in runs of round pipe and flexible duct through 90 degree . It has a sturdy galvanized steel construction and is simple to adjust. It is also crimped on 1 end to easily fit into a pipe or other fitting of the same diameter. Ships in 90 degree position.

• Used to make angular or gradual turns in runs of pipe
• Adjustable to any angle through 90 degree
• 30-Gauge, galvanized steel construction
• Always seal seams with building code approved sealant or duct tape (not included)
• Always insulate ductwork for greater system efficiency and comfort (not included)

The 4 in. Steel Round Gas Vent Top is a Type B, galvanized-steel fitting that helps prevent rain and debris from entering the vent. It is not for use with wood-burning applications. The end is die-formed for uniform sizing and a strong, easy-to-connect joint. The cap is tested and UL listed for safety in accordance with NFPA standards.

• Strong, durable galvanized steel
• Prevents rain and debris from entering the vent
• Not to be used with wood-burning applications
• Tested and listed per UL 441 for installation in single and multi-story buildings

Type B Gas Vent designed to the demands of the common category I appliance installation. Engineered to heat up rapidly and remain hot during the appliance operation to allow for minimal condensation. An innovative system for a lock tight connection called DuraLock.

• Use with natural gas and liquified propane (LP) category I appliances with a draft hood
• Designed to meet the rugged demand of the jobsite, with its inner wall recessed to eliminate damage in handling
• 1 in. clearance to combustibles in single and multi-family dwellings
• Innovative system for a lock tight connection called DuraLock

This Aluminum Pipe can be used to vent most types of heating units including gas and electric clothes dryers. This product features an easy to close snap lock system. It's composed of a non-combustible, all aluminum construction.

• 4 in. of diameter x 24 in. L
• Made of 0.012 in. aluminum
• Used for transition ducting, not for in wall use
• For correct and approved installation practices always consult your local building codes

Featuring die-formed ends to assure uniform sizing, the 4 in. x 24 in. Round Type B Gas Vent Pipe is ideal to connect to most 4 in. pipes. Made of strong, durable galvanized steel, it is built to last. Fully tested and listed per UL441 guidelines.

• Made of strong, durable galvanized steel, this vent pipe is built to last
• Die-formed ends to assure uniform sizing
• For use on approved gas appliances in residential, light commercial and industrial applications
• Exclusive lock tab feature adds versatility to installation
• Fits most 4 in. pipes
• In accordance with National Fire Protection Association NFPA54 and NFPA211 standards
• Type B gas vent is also referred to as b vent or type b vent
• Some common applications may include warm air furnaces, tank water heaters, residential boilers, common vented appliances and more
• Used on gas-fired category I natural draft appliances

Type B Gas Vent designed to the demands of the common category I appliance installation. Engineered to heat up rapidly and remain hot during the appliance operation to allow for minimal condensation. An innovative system for a lock tight connection called DuraLock.

• Use with natural gas and liquified propane (LP) category I appliances with a draft hood
• Enables the angle of the 3 ft. Dia vent run to be adjusted up to 90 from vertical, all vent runs must return to vertical before termination
• Aluminum inner wall and galvalume outer wall construction that features an industry leading twist-lock design
• 1 in. clearance to combustibles in a single or multi-family dwelling applications

Type B Gas Vent designed to the demands of the common category I appliance installation. Engineered to heat up rapidly and remain hot during the appliance operation to allow for minimal condensation. An innovative system for a lock tight connection called DuraLock.

• Use with natural gas and liquified propane (LP) category I appliances with a draft hood
• Allows a 3 in. Dia b-vent run to be increased to 4 in. for added draft
• Aluminum inner wall and galvalume outer wall construction that features an industry leading twist-lock design
• 1 in. clearance to combustibles in a single or multi-family dwelling applications

Master Flow Beaded Metal Pipe is available to help make your next HVAC project a success. Beaded pipe can be used as a main trunk line or branch line, as well as in return air situations. It maintains the most efficient characteristics for airflow and is common throughout the country. A simple snap lock design and sturdy galvanized steel construction on Master Flow beaded pipe creates a quick and secure installation that you can rely on.

• Beaded for strength
• Easy-to-install snap lock design
• Crimped end for a secure interlocking fit
• Can be cut to needed length with tin snips
• Always seal seams with building code approved sealant or duct tape
• Always insulate ductwork for greater system efficiency and comfort

Use to vent condensing appliances. Includes 1 Locking Clamp. PolyPro is an engineered alternative for condensing gas appliances. Engineered for venting, it is easier and faster to install than PVC, saving the contractor time and money. Polypropylene has a higher operating temperature limit of 230 degree F/110 degree C (PVC is 149 degree F/65 degree C max and CPVC is 194 degree F/90 degree C). PolyPro is engineered with a condensation management system.

• PolyPro is a polypropylene vent pipe for use with ANSI category II and IV gas-burning appliances, including high efficiency water heaters, condensing boilers and warm air furnaces
• 0 in. clearance to combustibles for exhaust temperatures up to 194 degree F / 90 degree C and 0 in. clearance for vertical installations up to exhaust temperatures of 230 degree F / 110 degree C and 1/4 in. / 6mm clearance to combustibles for horizontal installations at exhaust temperatures up to 230 degree F / 110 degree C
• Check with appliance manufacturer, Intertek / ETL Listed to ULC-S636 Listed as a class IIA, IIB, and IIC vent system
• PolyPro is an environmentally safe and engineered alternative, for condensing gas appliances
• Engineered for venting, it is 100% recyclable, and contains no toxic or carcinogenic materials, chlorides, or heavy metals
• PolyPro does not release hazardous gases during combustion, and has been used safely throughout Europe for over 20 years
• PolyPro is engineered with a corrosion-free, condensation management system
• Rigid pipe constructed of 2.2 mm (minimum) thick PolyPro
• Easy to install lightweight, assembles quickly, can be disassembled for inspection or cut to desired length
• Gasketed joint system, no adhesives nor primers required, no curing times and no special training, no mess

Type B Gas Vent designed to the demands of the common category I appliance installation. Dura Cap is required where the pipe terminates above the roof line. Use for vertical installations only.

• Use with natural gas and liquified propane (LP) category I appliances with a draft hood
• Engineered to heat up rapidly and remain hot during the appliance operation to allow for minimal condensation, an innovative system for a lock tight connection called DuraLock
• 1 in. clearance to combustibles in single and multi-family dwellings
• Available in 3 in. to 8 in. Dia
• Limited lifetime warranty
• Listed to UL 441, UL 1777 and ULC S628

The 4 in. Steel Round Storm Collar is made of durable, galvanized steel and designed to be applied above the flashing to provide a weatherproof seal of the pipe above the roofline. It is die-formed to assure uniform sizing for strong, easy-to-connect joints. A locktab feature offers the option of installation without sheet-metal screws. This Type B fitting is designed for use on approved gas appliances in residential, light commercial and industrial applications. It is UL listed for safety in accordance with NFPA standards.

• Strong, durable galvanized steel
• For use above the flashing to provide a weatherproof seal of the pipe above the roofline
• Locktab feature can be used instead of sheet-metal screws for ease of installation
• Uniform sizing for strong, easy-to-connect joints
• Tested and listed per UL 441 for installation in single and multi-story buildings

Master Flow Fresh Air Vents come with a built-in screen to prevent bird entry. They can be used to vent a combustion system or anywhere fresh air intake is needed. Constructed of galvanized steel.

• Sturdy galvanized steel construction
• Always seal seams with building code approved sealant or duct tape
• Install with sheet metal screws
• Built-in screen to prevent bird entry
• Maximum temperature rating of 390 degree F, minimum temperature rating of-100 degree F

The Master Flow Air-Tite 12 in. Take-Off is constructed of 30-gauge, galvanized steel for durability. This HVAC part is used to connect 12 in. round pipe or flexible duct to a flat surface. It features a tacky gasket to help create a secure, substantially airtight seal. This take-off has a maximum temperature rating of 390 degrees Fahrenheit.

• Use to connect 12 in. round pipe or flexible duct to a flat surface
• Install with sheet metal screws (not included)
• Always seal seams with code-approved sealant or duct tape (not included)
• Tacky gasket helps to create a secure, substantially airtight seal
• Maximum temperature rating of 390 degrees Fahrenheit, minimum temperature rating of -100 degrees Fahrenheit
• Tacky gasket creates a secure, substantially air-tight seal.
• Use to connect round pipe or flexible duct to flat surface.
• Install with sheet metal screws

The Master Flow 4 in. x 3 in. Round Reducer is made of galvanized steel. It features hemmed collar edges for enhanced strength and a secure fit. The reducer is used to transition from a 4 in. pipe to a 3 in. pipe in an HVAC system. It is suitable for most HVAC applications.

• Hemmed collar edges for an improved fit and increased strength
• Connects 4 in. pipe to 3 in. pipe in duct run
• Seal seams with code-approved mastic, sealant or duct tape (sold separately)
• Always insulate ductwork for greater system efficiency and comfort (insulation not included)

The Master Flow 10 in. Starting Collar is suitable for most HVAC applications. It provides a transition from a flat surface like a plenum (made from metal, ductboard or insulated) to round pipe or insulated flexible duct. It can be used with ductboard, an internally lined or unlined plenum. This galvanized steel starting collar features extra-long tabs to fit most duct board thicknesses.

• Install with sheet metal screws (not included)
• Fits most HVAC types for universal application
• Can be used with an internally lined or unlined plenum
• Extra-long tabs to fit most ductboard thicknesses through 1-1/2 in. (or R-6 value)
• Seal seams with code-approved mastic, sealant or duct tape (sold separately)

Type B Gas Vent designed to the demands of the common category I appliance installation. Engineered to heat up rapidly and remain hot during the appliance operation to allow for minimal condensation. An innovative system for a lock tight connection called DuraLock.

• Use with natural gas and liquified propane (LP) category I appliances with a draft hood
• Allows 4 in. Dia DuraVent brand b-vent to be attached to the bottom of a different brand b-vent like Selkirk or metal fab back to the appliance
• Aluminum inner wall and galvalume outer wall construction that features an industry leading twist-lock design
• Maintains UL Listing for both brands of b-vent

Master Flow Beaded Metal Pipe is available to help make your next HVAC project a success. Beaded pipe can be used as a main trunk line or branch line, as well as in return air situations. It maintains the most efficient characteristics for airflow and is common throughout the country. A simple snap lock design and sturdy galvanized steel construction on Master Flow beaded pipe creates a quick and secure installation that you can rely on.

• Beaded for strength
• Easy-to-install snap lock design
• Crimped end for a secure interlocking fit
• Can be cut to needed length with tin snips
• Always seal seams with building code approved sealant or duct tape
• Always insulate ductwork for greater system efficiency and comfort