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Standard Duct and Fittings
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Deliver air for a range of HVAC applications, including exhaust and dust collection. Our basic duct, the round shape creates smoother, more efficient airflow than rectangular and oval duct. The male end is slightly smaller than the female, so sections join without clamps or tools.
90° Elbow Collars
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Add a 90° branch from your rectangular system to connect to equipment that uses round duct. To install, cut a hole in your duct and attach the collar by bending the tabs. Then, connect a piece of round duct.
Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
Straight Collars
Link rectangular duct systems to equipment that uses round duct. Cut a hole, install the collar, and connect a piece of round duct.
Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
Galvanized Steel | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Duct Size | ID | OD | Ga. | Each | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Male | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| 3 | — | 2 7/8" | 28 | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 4 | — | 3 7/8" | 28 | 0000000 | 0000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 5 | — | 4 7/8" | 28 | 0000000 | 0000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 6 | — | 5 7/8" | 28 | 0000000 | 0000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 8 | — | 7 7/8" | 28 | 0000000 | 0000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 10 | — | 9 7/8" | 28 | 0000000 | 0000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 12 | — | 11 7/8" | 28 | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 14 | — | 13 7/8" | 28 | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 16 | — | 15 7/8" | 28 | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 18 | — | 17 7/8" | 28 | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 20 | — | 19 7/8" | 28 | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Female | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| 3 | 3" | — | 28 | 0000000 | 0000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 4 | 4" | — | 28 | 0000000 | 0000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 5 | 5" | — | 28 | 0000000 | 0000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 6 | 6" | — | 28 | 0000000 | 0000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 8 | 8" | — | 28 | 0000000 | 0000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 10 | 10" | — | 28 | 0000000 | 0000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 12 | 12" | — | 28 | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 14 | 14" | — | 28 | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 16 | 16" | — | 28 | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 18 | 18" | — | 28 | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 20 | 20" | — | 28 | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Tight-Seal Spiral Duct and Fittings
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Gasketed fittings prevent leaks between connections without the need for tape or other sealants. Duct has a continuous seam that reinforces it for strength and long life. The rigid construction keeps its shape, even against suction from dust collectors. Duct is smooth on the inside for efficient airflow. Because of its attractive look, spiral duct is often used for exposed heating and cooling systems.
Straight Collars
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Link rectangular duct systems to equipment that uses round duct. Cut a hole, install the collar, and connect a piece of round duct.
Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
Polyethylene Foam Gasket—The flange has an adhesive-backed gasket to bond the connection until you fasten with screws. The gasket also prevents leaks.
Galvanized Steel with EPDM Gasket | ||||||
|---|---|---|---|---|---|---|
Duct Size | OD | Bottom Gasket Material | Ga. | Each | ||
| 4 | 3 7/8" | Polyethylene Foam | 24 | 0000000 | 000000 | |
| 5 | 4 7/8" | Polyethylene Foam | 24 | 0000000 | 00000 | |
| 6 | 5 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 7 | 6 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 8 | 7 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 9 | 8 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 10 | 9 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 12 | 11 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 14 | 13 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 16 | 15 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 18 | 17 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 20 | 19 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 22 | 21 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 24 | 23 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
Straight Collars with Airflow Damper
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Add a branch of round duct from rectangular systems and control airflow with the damper. Cut a hole, install the collar, and connect a piece of tight-seal spiral round duct.
Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
Polyethylene Foam Gasket—The flange has an adhesive-backed gasket to bond the connection until you fasten with screws. The gasket also prevents leaks.
Galvanized Steel with EPDM Gasket | ||||||
|---|---|---|---|---|---|---|
Duct Size | OD | Bottom Gasket Material | Ga. | Each | ||
| 4 | 3 7/8" | Polyethylene Foam | 24 | 00000000 | 000000 | |
| 5 | 4 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 6 | 5 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 7 | 6 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 8 | 7 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 9 | 8 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 10 | 9 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 12 | 11 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 14 | 13 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 16 | 15 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 18 | 17 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 20 | 19 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 22 | 21 7/8" | Polyethylene Foam | 24 | 00000000 | 000000 | |
| 24 | 23 7/8" | Polyethylene Foam | 24 | 00000000 | 000000 | |
Spiral Duct and Fittings
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Reinforced with a continuous seam, this duct keeps its shape, even against suction from dust collection systems. On the inside, duct is smooth for efficient airflow. Because of its attractive look, spiral duct is often used for exposed heating and cooling systems.
Straight Collars
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Link rectangular duct systems to equipment that uses round duct. Cut a hole, install the collar, and connect a piece of round duct.
Corrosion-Resistant 304 Stainless Steel—The most corrosion-resistant metal duct we sell. It won’t rust or degrade in systems that exhaust chemical fumes or vent heat from industrial ovens and dryers.
Polyethylene Foam Gasket—The flange has an adhesive-backed gasket to bond the connection until you fasten with screws. The gasket also prevents leaks.
Corrosion-Resistant 304 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
Duct Size | OD | Bottom Gasket Material | Ga. | Each | ||
| 4 | 3 7/8" | Polyethylene Foam | 24 | 00000000 | 000000 | |
| 5 | 4 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 6 | 5 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 7 | 6 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 8 | 7 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 9 | 8 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 10 | 9 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 12 | 11 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 14 | 13 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 16 | 15 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 18 | 17 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
| 20 | 19 7/8" | Polyethylene Foam | 24 | 00000000 | 00000 | |
Rectangular Duct and Fittings
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Maximize the space in close quarters, such as inside walls and ceilings. As rectangular duct sizes increase, they get wider but not taller. This shape is most often used for heating and cooling inside buildings. Components connect with brackets.
Straight Collars
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Add a branch to an existing line of rectangular duct. Cut a hole in the duct, attach the collar by bending the tabs, and connect another piece of duct.
Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
