Metal Duct Sleeves | McMaster-Carr

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Length

176 Products

Component

Duct

Pair with fittings and accessories to convey and control airflow

22 products

Adjustment Sleeve

Close gaps between sections of duct without disassembling the line

43 products

Component

Transition between duct of different sizes

25 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.

Duct

Closed Duct

Pair with compatible fittings and accessories.

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.

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.

Lightweight Aluminum—One-third the weight of steel, aluminum ductwork is easier to handle during installation. Like galvanized steel, it resists rust in wet environments but won’t last as long.

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



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


	5	5"	4 7/8"	Welded	20	———	0	———	0	00000000	000000
	7	7"	5 7/8"	Welded	20	———	0	———	0	00000000	000000
	10	10"	9 7/8"	Welded	20	———	0	———	0	00000000	000000
	12	12"	11 7/8"	Welded	20	———	0	———	0	00000000	000000
	14	14"	13 7/8"	Welded	20	00000000	0000000	00000000	0000000	00000000	000000
	16	16"	15 7/8"	Welded	20	00000000	000000	00000000	000000	———	0
	18	18"	17 7/8"	Welded	20	00000000	000000	00000000	000000	———	0
	20	20"	19 7/8"	Welded	20	00000000	000000	00000000	00000000	———	0
	22	22"	21 7/8"	Welded	20	00000000	000000	———	0	———	0
	24	24"	23 7/8"	Welded	20	00000000	000000	———	0	———	0

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		Lightweight Aluminum
Duct Size	ID	OD	Seam Construction	Ga.		Each		Each		Each



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


	5	5"	4 7/8"	Welded	20	———	0	———	0	00000000	000000
	7	7"	6 7/8"	Welded	20	———	0	———	0	00000000	000000
	10	10"	9 7/8"	Welded	20	———	0	———	0	00000000	000000
	12	12"	11 7/8"	Welded	20	———	0	———	0	00000000	000000
	14	14"	13 7/8"	Welded	20	00000000	0000000	00000000	0000000	00000000	000000
	16	16"	15 7/8"	Welded	20	00000000	000000	00000000	000000	———	0
	18	18"	17 7/8"	Welded	20	———	0	00000000	000000	———	0
	20	20"	19 7/8"	Welded	20	———	0	00000000	000000	———	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
Duct Size	ID	Ga.		Each



	3	3"	26	00000000	000000


	4	4"	30	0000000	00000
	5	5"	30	0000000	00000
	6	6"	30	0000000	00000
	7	7"	30	0000000	00000
	8	8"	30	0000000	00000
	10	10"	28	0000000	00000
	12	12"	26	0000000	00000
	14	14"	26	00000000	00000
	16	16"	26	00000000	00000
	18	18"	26	00000000	00000


	20	20"	26	00000000	00000
	22	22"	26	00000000	00000
	24	24"	26	00000000	00000

Tee Connectors

Female × Female × Male

Split or merge airflow paths.

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	Ga.		Each	Ga.		Each
Female × Female × Male



		10	10"	9 7/8"	—	———	0	24	00000000	0000000


		12	12"	11 7/8"	—	———	0	24	00000000	000000
		14	14"	13 7/8"	—	———	0	24	00000000	000000
		16	16"	15 7/8"	—	———	0	24	00000000	000000
		18	18"	17 7/8"	—	———	0	24	00000000	000000
		20	20"	19 7/8"	24	00000000	0000000	24	00000000	000000
		22	22"	21 7/8"	22	00000000	000000	—	———	0
		24	24"	23 7/8"	22	00000000	000000	—	———	0

Straight Reducers


Female × Male	Male × Female

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		ID		OD		Galvanized Steel			Corrosion-Resistant 304 Stainless Steel			Lightweight Aluminum
	(A)	(B)	(A)	(B)	(A)	(B)	Ga.		Each	Ga.		Each	Ga.		Each
Female × Male



		4	3	4"	—	—	2 7/8"	—	———	0	—	———	0	24	00000000	000000


		12	8	12"	—	—	7 7/8"	—	———	0	24	00000000	0000000	—	———	0
		12	10	12"	—	—	9 7/8"	—	———	0	—	———	0	24	00000000	00000
		14	10	14"	—	—	9 7/8"	22	00000000	000000	24	00000000	000000	—	———	0
		14	12	14"	—	—	11 7/8"	22	00000000	00000	—	———	0	—	———	0
		16	12	16"	—	—	11 7/8"	22	00000000	00000	24	00000000	000000	—	———	0
		16	14	16"	—	—	13 7/8"	22	00000000	00000	—	———	0	—	———	0
		18	14	18"	—	—	13 7/8"	22	00000000	00000	24	00000000	000000	—	———	0
		18	16	18"	—	—	15 7/8"	22	00000000	00000	—	———	0	—	———	0
		20	16	20"	—	—	15 7/8"	24	00000000	000000	24	00000000	000000	—	———	0
		22	18	22"	—	—	17 7/8"	24	00000000	000000	—	———	0	—	———	0


		24	20	24"	—	—	19 7/8"	24	00000000	000000	—	———	0	—	———	0


		Male × Female



				4	3	—	3"	3 7/8"	—	24	00000000	00000	—	———	0	—	———	0


				5	4	—	4"	4 7/8"	—	24	00000000	00000	—	———	0	—	———	0
				18	14	—	14"	17 7/8"	—	24	00000000	00000	—	———	0	—	———	0
				20	18	—	18"	19 15/16"	—	24	00000000	00000	—	———	0	—	———	0
				22	20	—	20"	21 15/16"	—	24	00000000	00000	—	———	0	—	———	0
				24	22	—	22"	23 15/16"	—	24	00000000	00000	—	———	0	—	———	0

Tee Reducers

Connect duct of different diameters to split or merge airflow.

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

	Duct Size				OD		Galvanized Steel
	(A)	(B)	(C)	ID (A)	(B)	(C)	Ga.		Each
Female × Male × Male



		8	6	6	8"	5 7/8"	5 7/8"	24	00000000	0000000


		10	8	8	10"	7 7/8"	7 7/8"	24	00000000	000000
		12	8	8	12"	7 7/8"	7 7/8"	24	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

Quick-Disconnect Duct and Fittings

The fastest ductwork to disassemble for dust collection and other frequently cleaned systems. Join sections with quick-release clamps that open and close with a flip of the latch. Since you don’t need screws, welds, or tools, the installation time is half that of other duct types.

Adjustment Sleeves

Close gaps between sections of duct without disassembling the whole line. To install these sleeves, cut the end of your duct and place the O-ring on the cut piece. Then, slide the sleeve on and clamp in place.

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

Duct Adjustment Sleeves								Replacement O-Rings
				Galvanized Steel		Corrosion-Resistant 304 Stainless Steel
Duct Size	ID	Max. Sleeve Extension	Ga.		Each		Each		Each



	3	3 1/8"	7"	22	00000000	000000	00000000	000000	00000000	00000


	4	3 15/16"	7"	22	0000000	00000	00000000	00000	00000000	0000
	5	4 15/16"	7"	22	0000000	00000	00000000	00000	00000000	0000
	6	6"	7"	22	0000000	00000	00000000	00000	00000000	0000
	7	7"	7"	22	00000000	00000	00000000	00000	00000000	0000
	8	8"	7"	22	00000000	00000	00000000	00000	00000000	0000
	9	9"	7"	22	00000000	00000	00000000	00000	00000000	0000
	10	10"	7"	22	00000000	00000	00000000	00000	00000000	0000
	12	12 1/8"	7"	22	00000000	00000	00000000	000000	00000000	0000
	14	14 1/8"	7"	20	00000000	00000	00000000	000000	00000000	0000
	16	16 1/8"	7"	20	00000000	00000	00000000	000000	00000000	0000


	18	18"	7"	20	00000000	00000	———	0	00000000	00000
	18	18 1/16"	7"	20	00000000	00000	———	0	00000000	00000
	20	20"	7"	20	00000000	00000	———	0	00000000	00000
	20	20 1/16"	7"	20	———	0	00000000	000000	00000000	00000
	22	22"	7"	20	00000000	00000	———	0	00000000	00000
	24	24"	7"	20	00000000	000000	———	0	00000000	00000

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 Connectors

Join two lengths of duct.

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.

				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	—	———	0


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


		Female



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


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

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 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