Duct Take-Offs | McMaster-Carr

Filter by

Duct Size

Shape

Component

Material

Fitting Connection

Gender

Duct Type

Duct Profile

Gauge

End Construction

Performance

Export Control Classification Number (ECCN)

REACH

RoHS

DFARS Specialty Metals

Width

Gasket Material

72 Products

Duct Type

Standard

Our basic duct for a range of HVAC applications

26 products

Spiral

A continuous seam reinforces duct for strength and long life

40 products

Duct Type

Rectangular

Maximize space inside walls and ceilings

6 products

Performance

Tight Seal

Gasketed fittings prevent leaks between connections

28 products

Standard Duct and Fittings

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

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.

			Galvanized Steel
	Duct Size	OD	Ga.		Each
Male



		5	4 7/8"	30	0000000	000000


		6	5 7/8"	30	0000000	00000
		7	6 7/8"	30	0000000	00000
		8	7 7/8"	30	0000000	00000

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
	Duct Size	ID	OD	Ga.		Each
Male



		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



				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

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

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

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

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

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

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

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.

			Galvanized Steel
Wd.	Ht.	Ga.		Each



	8"	8"	28	0000000	000000


	10"	8"	28	0000000	00000
	12"	8"	28	0000000	00000
	14"	8"	28	0000000	00000
	16"	8"	26	0000000	00000
	24"	8"	26	0000000	00000