Metal Duct Sleeves | McMaster-Carr

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REACH

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Export Control Classification Number (ECCN)

2B999

EAR99

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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	18005K29	000000	18005K101	0000000


				5	5"	4 7/8"	24	18005K31	00000	18005K102	000000
				6	6"	5 7/8"	24	18005K32	00000	18005K24	000000
				7	7"	6 7/8"	24	18005K33	000000	18005K25	000000
				8	8"	7 7/8"	24	18005K34	000000	18005K26	000000
				10	10"	9 7/8"	24	18005K35	000000	18005K27	000000
				12	12"	11 7/8"	24	18005K36	000000	18005K28	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	1773K312	0000000


	5	5"	4 7/8"	Welded	20	———	0	———	0	1773K313	000000
	7	7"	5 7/8"	Welded	20	———	0	———	0	1773K314	000000
	10	10"	9 7/8"	Welded	20	———	0	———	0	1773K315	000000
	12	12"	11 7/8"	Welded	20	———	0	———	0	1773K316	000000
	14	14"	13 7/8"	Welded	20	1768K207	0000000	1768K223	0000000	1773K317	000000
	16	16"	15 7/8"	Welded	20	1768K208	000000	1768K224	000000	———	0
	18	18"	17 7/8"	Welded	20	1768K209	000000	1768K225	000000	———	0
	20	20"	19 7/8"	Welded	20	1768K218	000000	1768K226	00000000	———	0
	22	22"	21 7/8"	Welded	20	1768K219	000000	———	0	———	0
	24	24"	23 7/8"	Welded	20	1768K221	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	1773K318	0000000


	5	5"	4 7/8"	Welded	20	———	0	———	0	1773K319	000000
	7	7"	6 7/8"	Welded	20	———	0	———	0	1773K321	000000
	10	10"	9 7/8"	Welded	20	———	0	———	0	1773K322	000000
	12	12"	11 7/8"	Welded	20	———	0	———	0	1773K323	000000
	14	14"	13 7/8"	Welded	20	1768K211	0000000	1768K227	0000000	1773K324	000000
	16	16"	15 7/8"	Welded	20	1768K212	000000	1768K228	000000	———	0
	18	18"	17 7/8"	Welded	20	———	0	1768K229	000000	———	0
	20	20"	19 7/8"	Welded	20	———	0	1768K231	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	1766K208	000000


	4	4"	30	1766K91	00000
	5	5"	30	1766K92	00000
	6	6"	30	1766K93	00000
	7	7"	30	1766K94	00000
	8	8"	30	1766K95	00000
	10	10"	28	1766K96	00000
	12	12"	26	1766K97	00000
	14	14"	26	1766K201	00000
	16	16"	26	1766K209	00000
	18	18"	26	1766K211	00000


	20	20"	26	1766K212	00000
	22	22"	26	1766K213	00000
	24	24"	26	1766K214	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	1767K303	0000000


		12	12"	11 7/8"	—	———	0	24	1767K304	000000
		14	14"	13 7/8"	—	———	0	24	1767K308	000000
		16	16"	15 7/8"	—	———	0	24	1767K309	000000
		18	18"	17 7/8"	—	———	0	24	1767K311	000000
		20	20"	19 7/8"	24	1766K216	0000000	24	1767K312	000000
		22	22"	21 7/8"	22	1766K221	000000	—	———	0
		24	24"	23 7/8"	22	1766K222	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	1773K325	000000


		12	8	12"	—	—	7 7/8"	—	———	0	24	1767K313	0000000	—	———	0
		12	10	12"	—	—	9 7/8"	—	———	0	—	———	0	24	1773K326	00000
		14	10	14"	—	—	9 7/8"	22	2013K704	000000	24	1767K314	000000	—	———	0
		14	12	14"	—	—	11 7/8"	22	2013K705	00000	—	———	0	—	———	0
		16	12	16"	—	—	11 7/8"	22	2013K706	00000	24	1767K315	000000	—	———	0
		16	14	16"	—	—	13 7/8"	22	2013K707	00000	—	———	0	—	———	0
		18	14	18"	—	—	13 7/8"	22	2013K708	00000	24	1767K316	000000	—	———	0
		18	16	18"	—	—	15 7/8"	22	2013K709	00000	—	———	0	—	———	0
		20	16	20"	—	—	15 7/8"	24	2013K714	00000	24	1767K317	000000	—	———	0
		22	18	22"	—	—	17 7/8"	24	2013K715	00000	—	———	0	—	———	0


		24	20	24"	—	—	19 7/8"	24	2013K716	000000	—	———	0	—	———	0


		Male × Female



				4	3	—	3"	3 7/8"	—	24	2013K711	00000	—	———	0	—	———	0


				5	4	—	4"	4 7/8"	—	24	2013K712	00000	—	———	0	—	———	0
				18	14	—	14"	17 7/8"	—	24	2013K713	00000	—	———	0	—	———	0
				20	18	—	18"	19 15/16"	—	24	2013K701	00000	—	———	0	—	———	0
				22	20	—	20"	21 15/16"	—	24	2013K702	00000	—	———	0	—	———	0
				24	22	—	22"	23 15/16"	—	24	2013K703	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	1766K217	0000000


		10	8	8	10"	7 7/8"	7 7/8"	24	1766K218	000000
		12	8	8	12"	7 7/8"	7 7/8"	24	1766K219	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"	1786K21	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	1822K313	000000


		5	4 3/4"	6"	11 3/4"	2 1/8"	Locking Screw	1822K314	00000
		6	5 13/16"	7"	14 3/8"	2 1/8"	Locking Screw	1822K315	00000
		7	6 13/16"	8"	15 5/8"	2 1/2"	Locking Screw	1822K316	00000
		8	7 7/8"	9 5/8"	18 1/8"	3 1/2"	Locking Screw	1822K317	00000
		10	9 13/16"	11 3/8"	22 1/8"	3 3/4"	Locking Screw	1822K319	000000
		12	11 13/16"	13 1/4"	26 3/4"	3 5/8"	Locking Screw	1822K322	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	1761K105	000000	2538K503	000000	1761K371	00000


	4	3 15/16"	7"	22	1761K32	00000	2538K121	00000	1761K324	0000
	5	4 15/16"	7"	22	1761K33	00000	2538K122	00000	1761K335	0000
	6	6"	7"	22	1761K34	00000	2538K123	00000	1761K346	0000
	7	7"	7"	22	1761K629	00000	2538K764	00000	1761K352	0000
	8	8"	7"	22	1761K127	00000	2538K124	00000	1761K347	0000
	9	9"	7"	22	1761K631	00000	2538K765	00000	1761K353	0000
	10	10"	7"	22	1761K128	00000	2538K125	00000	1761K348	0000
	12	12 1/8"	7"	22	1761K129	00000	2538K126	000000	1761K349	0000
	14	14 1/8"	7"	20	1761K123	00000	2538K653	000000	1761K224	0000
	16	16 1/8"	7"	20	1761K124	00000	2538K654	000000	1761K226	0000


	18	18"	7"	20	1761K666	00000	———	0	1761K671	00000
	18	18 1/16"	7"	20	1761K373	00000	———	0	1761K671	00000
	20	20"	7"	20	1761K667	00000	———	0	1761K672	00000
	20	20 1/16"	7"	20	———	0	2538K511	000000	1761K672	00000
	22	22"	7"	20	1761K668	00000	———	0	1761K673	00000
	24	24"	7"	20	1761K669	000000	———	0	1761K674	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	5078K44	000000	—	———	0	—	———	0


		4	—	3 7/8"	24	5078K45	00000	26	1889K311	000000	24	2561K33	000000
		5	—	4 7/8"	24	5078K47	00000	26	1889K312	00000	—	———	0
		6	—	5 7/8"	24	5078K48	00000	26	1889K313	00000	24	2561K34	00000
		7	—	6 7/8"	—	———	0	26	1889K314	00000	—	———	0
		8	—	7 7/8"	24	5078K51	00000	26	1889K315	00000	24	2561K35	00000
		9	—	8 7/8"	—	———	0	26	1889K316	00000	—	———	0
		10	—	9 7/8"	24	5078K53	00000	26	1889K317	00000	24	2561K36	00000
		12	—	11 7/8"	24	5078K54	00000	26	1889K319	00000	—	———	0
		14	—	13 7/8"	22	5078K83	00000	—	———	0	—	———	0
		16	—	15 7/8"	22	5078K84	00000	—	———	0	—	———	0


		Female



				3	3"	—	24	5078K223	0000	—	———	0	—	———	0


				4	4"	—	24	5078K224	0000	—	———	0	—	———	0
				5	5"	—	24	5078K225	0000	—	———	0	—	———	0
				6	6"	—	24	5078K226	0000	—	———	0	—	———	0
				8	8"	—	24	5078K227	0000	—	———	0	—	———	0
				10	10"	—	24	5078K228	00000	—	———	0	—	———	0
				12	12"	—	24	5078K229	00000	—	———	0	—	———	0
				14	14"	—	22	5078K231	00000	—	———	0	—	———	0
				16	16"	—	22	5078K232	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	2226K26	000000


		6	5 7/8"	24	2226K27	00000
		8	7 7/8"	24	2226K28	00000
		10	9 7/8"	24	2226K29	00000
		12	11 7/8"	24	2226K31	00000