Spiral Duct Fittings | McMaster-Carr

Filter by

Duct Size

Shape

Material

Component

Finish

Gender

Gauge

End Construction

Duct Type

Performance

RoHS

REACH

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

Length

Gasket Material

473 Products

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.

Duct

Pair with compatible fittings and accessories.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

Chemical-Resistant PVC-Coated Steel—This duct combines the strength of steel with the chemical resistance of plastic. More economical than 304 stainless steel and stronger than PVC, it’s often used to exhaust corrosive gases, vapors, and fumes.

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.

			2 ft. Long			5 ft. Long
	Duct Size	ID	Ga.		Each	Ga.		Each
Galvanized Steel



		3	3"	26	00000000	000000	26	0000000	000000


		4	4"	26	0000000	00000	26	0000000	00000
		5	5"	26	0000000	00000	26	0000000	00000
		6	6"	26	0000000	00000	26	0000000	00000
		7	7"	26	00000000	00000	26	00000000	00000
		8	8"	26	0000000	00000	26	0000000	00000
		9	9"	26	00000000	00000	26	00000000	00000
		10	10"	26	0000000	00000	26	0000000	00000
		12	12"	26	0000000	00000	26	0000000	00000
		14	14"	24	0000000	00000	24	0000000	000000
		16	16"	24	0000000	00000	24	0000000	000000


		18	18"	24	00000000	00000	24	00000000	000000
		20	20"	—	———	0	24	00000000	000000
		22	22"	24	00000000	00000	24	00000000	000000
		24	24"	24	00000000	000000	24	00000000	000000


		Chemical-Resistant PVC-Coated Steel



				4	4"	—	———	0	26	00000000	00000


				5	5"	—	———	0	26	00000000	000000
				6	6"	—	———	0	26	00000000	000000
				7	7"	—	———	0	26	00000000	000000
				8	8"	—	———	0	26	00000000	000000
				9	9"	—	———	0	26	00000000	000000
				10	10"	—	———	0	26	00000000	000000
				12	12"	—	———	0	26	00000000	000000


				Corrosion-Resistant 304 Stainless Steel



						3	3"	24	00000000	00000	24	00000000	000000


						4	4"	24	0000000	00000	24	0000000	000000
						5	5"	24	00000000	00000	24	00000000	000000
						6	6"	24	0000000	00000	24	0000000	000000
						7	7"	24	00000000	00000	24	00000000	000000
						8	8"	24	0000000	000000	24	0000000	000000
						10	10"	24	0000000	000000	24	0000000	000000
						12	12"	24	00000000	000000	24	00000000	000000
						14	14"	—	———	0	24	00000000	000000
						16	16"	24	00000000	000000	24	00000000	000000
						18	18"	24	00000000	000000	24	00000000	000000


						20	20"	—	———	0	24	00000000	000000

90° Elbow Connectors

Change the direction of airflow when joining lengths of duct.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

		Galvanized Steel			Chemical-Resistant PVC-Coated Steel			Corrosion-Resistant 304 Stainless Steel
Duct Size	OD	Ga.		Each	Ga.		Each	Ga.		Each
3	2 7/8"	24	0000000	000000	—	———	0	20	00000000	0000000
4	3 7/8"	24	0000000	00000	24	00000000	000000	20	0000000	000000
5	4 7/8"	24	0000000	00000	24	00000000	000000	20	00000000	000000
6	5 7/8"	24	0000000	00000	24	00000000	000000	20	0000000	000000
7	6 7/8"	24	00000000	00000	24	00000000	000000	20	00000000	000000
8	7 7/8"	24	0000000	00000	24	00000000	000000	20	0000000	000000
9	8 7/8"	22	00000000	00000	24	00000000	000000	24	00000000	000000
10	9 7/8"	24	0000000	00000	24	00000000	000000	20	0000000	000000
12	11 7/8"	24	0000000	000000	24	00000000	000000	24	00000000	000000
14	13 7/8"	24	0000000	000000	—	———	0	24	00000000	000000
16	15 7/8"	24	0000000	000000	—	———	0	24	00000000	000000
18	17 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
20	19 7/8"	24	00000000	000000	—	———	0	—	———	0
22	21 7/8"	22	00000000	000000	—	———	0	—	———	0
24	23 7/8"	22	00000000	000000	—	———	0	—	———	0

45° Elbow Connectors

Change the direction of airflow when joining lengths of duct.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

		Galvanized Steel			Chemical-Resistant PVC-Coated Steel			Corrosion-Resistant 304 Stainless Steel
Duct Size	OD	Ga.		Each	Ga.		Each	Ga.		Each
3	2 7/8"	24	00000000	000000	—	———	0	20	00000000	000000
4	3 7/8"	24	00000000	00000	24	00000000	000000	20	0000000	000000
5	4 7/8"	24	00000000	00000	24	00000000	00000	20	00000000	000000
6	5 7/8"	24	00000000	00000	24	00000000	00000	20	0000000	000000
7	6 7/8"	24	00000000	00000	24	00000000	00000	20	00000000	000000
8	7 7/8"	24	00000000	00000	24	00000000	00000	20	0000000	000000
9	8 7/8"	24	00000000	00000	24	00000000	000000	24	00000000	000000
10	9 7/8"	24	00000000	00000	24	00000000	000000	20	0000000	000000
12	11 7/8"	24	00000000	00000	24	00000000	000000	24	00000000	000000
14	13 7/8"	24	00000000	00000	—	———	0	24	00000000	000000
16	15 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
18	17 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
20	19 7/8"	24	00000000	000000	—	———	0	—	———	0
22	21 7/8"	24	00000000	000000	—	———	0	—	———	0
24	23 7/8"	24	00000000	000000	—	———	0	—	———	0

Straight Connectors

Join two lengths of duct.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

				Galvanized Steel			Chemical-Resistant PVC-Coated Steel			Corrosion-Resistant 304 Stainless Steel
	Duct Size	ID	OD	Ga.		Each	Ga.		Each	Ga.		Each
Male



		3	—	2 7/8"	24	0000000	000000	—	———	0	24	00000000	000000


		4	—	3 7/8"	24	0000000	00000	26	00000000	000000	24	0000000	00000
		5	—	4 7/8"	24	0000000	00000	26	00000000	00000	24	00000000	00000
		6	—	5 7/8"	24	0000000	00000	26	00000000	00000	24	0000000	00000
		7	—	6 7/8"	24	00000000	00000	26	00000000	00000	24	00000000	00000
		8	—	7 7/8"	24	0000000	00000	26	00000000	00000	24	0000000	00000
		9	—	8 7/8"	24	00000000	00000	26	00000000	00000	24	00000000	00000
		10	—	9 7/8"	24	0000000	00000	26	00000000	00000	24	0000000	00000
		12	—	11 7/8"	24	0000000	00000	26	00000000	00000	24	00000000	00000
		14	—	13 7/8"	22	0000000	00000	—	———	0	22	00000000	00000
		16	—	15 7/8"	22	0000000	00000	—	———	0	22	00000000	00000


		18	—	17 7/8"	22	00000000	00000	—	———	0	22	00000000	00000
		20	—	19 7/8"	22	00000000	00000	—	———	0	22	00000000	00000
		22	—	21 7/8"	22	00000000	00000	—	———	0	—	———	0
		24	—	23 7/8"	22	00000000	00000	—	———	0	—	———	0


		Female



				3	3"	—	24	00000000	0000	—	———	0	24	00000000	00000


				4	4"	—	24	00000000	0000	—	———	0	24	00000000	00000
				5	5"	—	24	00000000	0000	—	———	0	24	00000000	00000
				6	6"	—	24	00000000	0000	—	———	0	24	00000000	00000
				7	7"	—	24	00000000	00000	—	———	0	24	00000000	00000
				8	8"	—	24	00000000	0000	—	———	0	24	00000000	00000
				9	9"	—	24	00000000	00000	—	———	0	24	00000000	00000
				10	10"	—	24	00000000	00000	—	———	0	24	00000000	00000
				12	12"	—	24	00000000	00000	—	———	0	24	00000000	00000
				14	14"	—	22	00000000	00000	—	———	0	22	00000000	00000
				16	16"	—	22	00000000	00000	—	———	0	22	00000000	00000


				18	18"	—	22	00000000	00000	—	———	0	22	00000000	00000
				20	20"	—	22	00000000	00000	—	———	0	22	00000000	00000
				22	22"	—	22	00000000	00000	—	———	0	—	———	0
				24	24"	—	22	00000000	00000	—	———	0	—	———	0

Tee Connectors

Split or merge airflow paths.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

		Galvanized Steel			Chemical-Resistant PVC-Coated Steel			Corrosion-Resistant 304 Stainless Steel
Duct Size	OD	Ga.		Each	Ga.		Each	Ga.		Each
3	2 7/8"	24	00000000	000000	—	———	0	24	00000000	0000000
4	3 7/8"	24	00000000	00000	24	00000000	000000	24	00000000	000000
5	4 7/8"	24	00000000	00000	—	———	0	24	00000000	000000
6	5 7/8"	24	00000000	00000	24	00000000	00000	24	00000000	000000
7	6 7/8"	24	00000000	00000	—	———	0	24	00000000	000000
8	7 7/8"	24	00000000	00000	24	00000000	000000	24	00000000	000000
9	8 7/8"	24	00000000	00000	—	———	0	24	00000000	000000
10	9 7/8"	24	00000000	00000	24	00000000	000000	24	00000000	000000
12	11 7/8"	24	00000000	000000	24	00000000	000000	24	00000000	000000
14	13 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
16	15 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
18	17 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
20	19 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
22	21 7/8"	22	00000000	000000	—	———	0	—	———	0
24	23 7/8"	22	00000000	000000	—	———	0	—	———	0

45° Wye Connectors

Split or merge airflow more gradually than tees. With less abrupt changes in direction, wyes reduce turbulence for smoother flow.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

		Galvanized Steel			Chemical-Resistant PVC-Coated Steel			Corrosion-Resistant 304 Stainless Steel
Duct Size	OD	Ga.		Each	Ga.		Each	Ga.		Each
3	2 7/8"	24	00000000	0000000	—	———	0	24	00000000	0000000
4	3 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
5	4 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
6	5 7/8"	24	00000000	00000	24	00000000	0000000	24	00000000	000000
7	6 7/8"	24	00000000	00000	—	———	0	24	00000000	000000
8	7 7/8"	24	00000000	00000	24	00000000	000000	24	00000000	000000
9	8 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
10	9 7/8"	24	00000000	000000	24	00000000	000000	24	00000000	000000
12	11 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
14	13 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
16	15 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
18	17 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
20	19 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
22	21 7/8"	24	00000000	000000	—	———	0	—	———	0
24	23 7/8"	24	00000000	000000	—	———	0	—	———	0

Straight Reducers

Transition between duct of different diameters. Reducers also join larger duct with smaller duct that connects to equipment.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

Duct Size		OD		Galvanized Steel			Chemical-Resistant PVC-Coated Steel			Corrosion-Resistant 304 Stainless Steel
(A)	(B)	(A)	(B)	Ga.		Each	Ga.		Each	Ga.		Each
4	3	3 7/8"	2 7/8"	24	0000000	000000	—	———	0	24	00000000	000000
5	4	4 7/8"	3 7/8"	24	0000000	00000	20	00000000	000000	24	00000000	00000
6	4	5 7/8"	3 7/8"	24	0000000	00000	20	00000000	00000	20	0000000	00000
6	5	5 7/8"	4 7/8"	24	0000000	00000	20	00000000	00000	24	00000000	00000
7	6	6 7/8"	5 7/8"	24	00000000	00000	20	00000000	00000	24	00000000	00000
8	6	7 7/8"	5 7/8"	24	0000000	00000	20	00000000	00000	20	0000000	000000
8	7	7 7/8"	6 7/8"	24	00000000	00000	20	00000000	00000	24	00000000	000000
9	8	8 7/8"	7 7/8"	24	00000000	00000	20	00000000	00000	24	00000000	000000
10	6	9 7/8"	5 7/8"	24	0000000	00000	—	———	0	20	0000000	000000
10	8	9 7/8"	7 7/8"	24	0000000	00000	20	00000000	000000	20	0000000	000000
10	9	9 7/8"	8 7/8"	24	00000000	00000	20	00000000	000000	—	———	0
12	6	11 7/8"	5 7/8"	24	0000000	00000	—	———	0	—	———	0
12	8	11 7/8"	7 7/8"	24	0000000	00000	—	———	0	—	———	0
12	10	11 7/8"	9 7/8"	24	0000000	00000	20	00000000	000000	24	00000000	000000
14	12	13 7/8"	11 7/8"	24	0000000	00000	—	———	0	24	00000000	000000
16	14	15 7/8"	13 7/8"	24	0000000	00000	—	———	0	24	00000000	000000
18	16	17 7/8"	15 7/8"	22	00000000	00000	—	———	0	24	00000000	000000
20	18	19 7/8"	17 7/8"	24	00000000	000000	—	———	0	24	00000000	000000
22	20	21 7/8"	19 7/8"	24	00000000	000000	—	———	0	—	———	0
24	22	23 7/8"	21 7/8"	24	00000000	000000	—	———	0	—	———	0

Tee Reducers

Connect duct of different diameters to split or merge airflow.

Duct Size			OD			Chemical-Resistant PVC-Coated Steel
(A)	(B)	(C)	(A)	(B)	(C)	Ga.		Each
6	4	6	5 7/8"	3 7/8"	5 7/8"	24	00000000	000000
8	6	8	7 7/8"	5 7/8"	7 7/8"	24	00000000	000000
10	8	10	9 7/8"	7 7/8"	9 7/8"	24	00000000	000000
12	8	12	11 7/8"	7 7/8"	11 7/8"	24	00000000	000000

45° Wye Reducers

Connect duct of different diameters to split or merge airflow more gradually than tees. With less abrupt changes in direction, wyes reduce turbulence for smoother flow.

Duct Size			OD			Chemical-Resistant PVC-Coated Steel
(A)	(B)	(C)	(A)	(B)	(C)	Ga.		Each
6	4	6	5 7/8"	3 7/8"	5 7/8"	24	00000000	000000
8	6	8	7 7/8"	5 7/8"	7 7/8"	24	00000000	000000
10	8	10	9 7/8"	7 7/8"	9 7/8"	24	00000000	000000
12	10	12	11 7/8"	9 7/8"	11 7/8"	24	00000000	000000

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.

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

End Caps

Cover unused duct openings to prevent air from leaking, dust from escaping, and debris from entering. End caps are often used to seal duct after changes to your system or equipment. To make modifications or expand your line, remove the cap.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

		Galvanized Steel			Corrosion-Resistant 304 Stainless Steel
Duct Size	OD	Ga.		Each	Ga.		Each
3	2 7/8"	24	0000000	000000	24	00000000	000000
4	3 7/8"	24	0000000	00000	24	0000000	00000
5	4 7/8"	24	0000000	00000	24	00000000	00000
6	5 7/8"	24	0000000	00000	24	0000000	00000
7	6 7/8"	24	00000000	00000	24	00000000	00000
8	7 7/8"	24	0000000	00000	24	0000000	00000
9	8 7/8"	24	00000000	00000	24	00000000	00000
10	9 7/8"	24	0000000	00000	24	0000000	00000
12	11 7/8"	24	0000000	00000	24	00000000	00000
14	13 7/8"	24	0000000	00000	24	00000000	000000
16	15 7/8"	24	0000000	00000	24	00000000	000000
18	17 7/8"	22	00000000	00000	24	00000000	000000
20	19 7/8"	24	00000000	00000	24	00000000	000000
22	21 7/8"	24	00000000	00000	—	———	0
24	23 7/8"	24	00000000	00000	—	———	0

Duct Noise Reducers

Muffle noise from high-velocity airflow and fans, blowers, and dust collectors. These reducers are insulated to decrease noise levels in your facility by half.

Galvanized Steel—Strong and corrosion resistant, galvanized steel is the most commonly used ductwork material.

		Overall			Galvanized Steel with Rubber Gasket
Duct Size	OD	Dia.	Lg.	Sound Absorbed	Ga.		Each
4	3 7/8"	8 1/4"	23 5/8"	50%	24	000000	0000000
5	4 7/8"	9 1/4"	23 5/8"	50%	24	000000	000000
6	5 7/8"	10 5/8"	23 5/8"	50%	24	000000	000000
8	7 7/8"	12 3/4"	23 5/8"	50%	24	000000	000000
10	9 7/8"	14 3/8"	35 3/8"	50%	24	000000	000000
12	12 3/8"	16 3/4"	35 3/8"	50%	24	000000	000000

Duct Floor Sweeps

Get dust and debris off your floor and into your collection system. Open the hinged door of these sweeps and push material inside so it can be sucked away.

Galvanized Steel—Strong and corrosion resistant, galvanized steel is the most commonly used ductwork material.

		Overall			Galvanized Steel
Duct Size	ID	Wd.	Ht.	Dp.	Ga.		Each
6	6"	11 1/8"	18 1/4"	6"	18	00000000	0000000

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.

Duct

Pair with compatible fittings and accessories.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

			5 ft. Long
	Duct Size	ID	Ga.		Each
Galvanized Steel



		4	4"	26	0000000	000000


		6	6"	26	0000000	00000
		8	8"	26	0000000	00000
		10	10"	26	0000000	00000
		12	12"	26	0000000	00000

90° Elbow Connectors

Change the direction of airflow when joining lengths of duct.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

		Galvanized Steel with EPDM Gasket
Duct Size	OD	Ga.		Each
4	3 7/8"	24	0000000	000000
6	5 7/8"	24	0000000	00000
8	7 7/8"	24	0000000	00000
10	9 7/8"	24	0000000	00000
12	11 7/8"	24	0000000	00000

45° Elbow Connectors

Change the direction of airflow when joining lengths of duct.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

		Galvanized Steel with EPDM Gasket
Duct Size	OD	Ga.		Each
4	3 7/8"	24	0000000	000000
6	5 7/8"	24	0000000	00000
8	7 7/8"	24	0000000	00000
10	9 7/8"	24	0000000	00000
12	11 7/8"	24	0000000	00000

Straight Connectors

Join two lengths of duct.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

			Galvanized Steel with EPDM Gasket
	Duct Size	OD	Ga.		Each
Male



		4	3 7/8"	24	0000000	000000


		6	5 7/8"	24	0000000	00000
		8	7 7/8"	24	0000000	00000
		10	9 7/8"	24	0000000	00000
		12	11 7/8"	24	0000000	00000

Tee Connectors

Split or merge airflow paths.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

		Galvanized Steel with EPDM Gasket
Duct Size	OD	Ga.		Each
4	3 7/8"	24	0000000	000000
6	5 7/8"	24	0000000	00000
8	7 7/8"	24	0000000	00000
10	9 7/8"	24	0000000	00000
12	11 7/8"	24	0000000	000000

Straight Reducers

Transition between duct of different diameters. Reducers also join larger duct with smaller duct that connects to equipment.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

Duct Size		OD		Galvanized Steel with EPDM Gasket
(A)	(B)	(A)	(B)	Ga.		Each
6	4	5 7/8"	3 7/8"	20	0000000	000000
8	6	7 7/8"	5 7/8"	20	0000000	00000
10	6	9 7/8"	5 7/8"	20	0000000	00000
10	8	9 7/8"	7 7/8"	20	0000000	00000
12	8	11 7/8"	7 7/8"	20	0000000	00000
12	10	11 7/8"	9 7/8"	20	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.

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

End Caps

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

		Galvanized Steel with EPDM Gasket
Duct Size	OD	Ga.		Each
4	3 7/8"	24	0000000	000000
6	5 7/8"	24	0000000	00000
8	7 7/8"	24	0000000	00000
10	9 7/8"	24	0000000	00000
12	11 7/8"	24	0000000	00000

Duct Noise Reducers

Muffle noise from high-velocity airflow and fans, blowers, and dust collectors. These reducers are insulated to decrease noise levels in your facility by half.

Galvanized Steel—Strong and corrosion resistant, galvanized steel is the most commonly used ductwork material.

		Overall			Galvanized Steel with Rubber Gasket
Duct Size	OD	Dia.	Lg.	Sound Absorbed	Ga.		Each
4	3 7/8"	8 1/4"	23 5/8"	50%	24	000000	0000000
6	5 7/8"	10 5/8"	23 5/8"	50%	24	000000	000000
8	7 7/8"	12 3/4"	23 5/8"	50%	24	000000	000000
10	9 7/8"	14 3/8"	35 3/8"	50%	24	000000	000000
12	12 3/8"	16 3/4"	35 3/8"	50%	24	000000	000000

Duct Floor Sweeps

Get dust and debris off your floor and into your collection system. Open the hinged door of these sweeps and push material inside so it can be sucked away.

Galvanized Steel—Strong and corrosion resistant, galvanized steel is the most commonly used ductwork material.

		Overall			Galvanized Steel
Duct Size	ID	Wd.	Ht.	Dp.	Ga.		Each
6	6"	11 1/8"	18 1/4"	6"	18	00000000	0000000

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.

Duct

Closed Duct

Pair with compatible fittings and accessories.

Closed Duct—With a closed seam, this duct is stronger and less prone to air leaks than open duct. However, it’s not as quick to modify when installing.

					2 ft. Long		5 ft. Long
	Duct Size	ID	OD	Ga.		Each		Each
Corrosion-Resistant 304 Stainless Steel







				Closed Duct

				4	4"	3 7/8"	24	00000000	000000	000000000	0000000


				5	5"	4 7/8"	24	00000000	00000	000000000	000000
				6	6"	5 7/8"	24	00000000	00000	00000000	000000
				7	7"	6 7/8"	24	00000000	000000	00000000	000000
				8	8"	7 7/8"	24	00000000	000000	00000000	000000
				10	10"	9 7/8"	24	00000000	000000	00000000	000000
				12	12"	11 7/8"	24	00000000	000000	00000000	000000

90° Elbow Connectors

Change the direction of airflow when joining lengths of duct.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

					Galvanized Steel		Corrosion-Resistant 304 Stainless Steel
Duct Size	ID	OD	Seam Construction	Ga.		Each		Each



	3	3"	2 7/8"	Welded	20	———	0	00000000	0000000


	4	4"	3 7/8"	Welded	20	0000000	0000000	00000000	000000
	5	5"	4 7/8"	Welded	20	0000000	000000	00000000	000000
	6	6"	5 7/8"	Welded	20	0000000	000000	00000000	000000
	7	7"	6 7/8"	Welded	20	0000000	000000	00000000	000000
	8	8"	7 7/8"	Welded	20	0000000	000000	00000000	000000
	10	10"	9 7/8"	Welded	20	0000000	000000	00000000	000000
	12	12"	11 7/8"	Welded	20	0000000	000000	00000000	000000

45° Elbow Connectors

Welded Seam

Change the direction of airflow when joining lengths of duct.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

					Galvanized Steel		Corrosion-Resistant 304 Stainless Steel
Duct Size	ID	OD	Seam Construction	Ga.		Each		Each



	3	3"	2 7/8"	Welded	20	———	0	00000000	0000000


	4	4"	3 7/8"	Welded	20	0000000	0000000	00000000	000000
	5	5"	4 7/8"	Welded	20	0000000	000000	00000000	000000
	6	6"	5 7/8"	Welded	20	0000000	000000	00000000	000000
	7	7"	6 7/8"	Welded	20	0000000	000000	00000000	000000
	8	8"	7 7/8"	Welded	20	0000000	000000	00000000	000000
	10	10"	9 7/8"	Welded	20	0000000	000000	00000000	000000
	12	12"	11 7/8"	Welded	20	0000000	000000	00000000	000000

Duct Damper Handles

Pair with your own blade to create an economical damper for existing duct.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

	Galvanized Steel
For Max. Damper Blade Thk.		Each
0.022"	0000000	00000

Duct Blast Gates

Open and close the slide to control airflow to sections of duct. Blast gates turn flow on or off.

Aluminum with 304 Stainless Steel Slide—These blast gates have a 304 stainless steel slide that holds up to moisture and mild chemicals better than galvanized steel. The aluminum body reduces stress on your duct.

			Overall
	Duct Size	OD	Wd.	Ht.	Dp.	Features		Each
Aluminum with 304 Stainless Steel Slide



		4	3 7/8"	5"	9 1/8"	1 7/8"	Locking Screw	00000000	000000


		5	4 3/4"	6"	11 3/4"	2 1/8"	Locking Screw	00000000	00000
		6	5 13/16"	7"	14 3/8"	2 1/8"	Locking Screw	00000000	00000
		7	6 13/16"	8"	15 5/8"	2 1/2"	Locking Screw	00000000	00000
		8	7 7/8"	9 5/8"	18 1/8"	3 1/2"	Locking Screw	00000000	00000
		10	9 13/16"	11 3/8"	22 1/8"	3 3/4"	Locking Screw	00000000	000000
		12	11 13/16"	13 1/4"	26 3/4"	3 5/8"	Locking Screw	00000000	000000

Duct Floor Sweeps

Get dust and debris off your floor and into your collection system. Open the hinged door of these sweeps and push material inside so it can be sucked away.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

Connectors—You'll need these to join floor sweeps with spiral or tight-seal spiral duct.

Duct Floor Sweeps								Galvanized Steel Connectors for Spiral Duct		Galvanized Steel Connectors for Tight-Seal Spiral Duct
		Overall				Galvanized Steel
Duct Size	ID	Wd.	Ht.	Dp.	Ga.		Each		Each		Each
6	6"	11 1/8"	18 1/4"	6"	18	00000000	0000000	0000000	000000	0000000	000000