28 Gauge Duct | McMaster-Carr

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Component

Shape

Adjustable-Angle Elbow

Duct Size

Duct Profile

System of Measurement

Duct Type

Fitting Connection

Width

Material

Gender

Finish

Aluminum-Zinc Alloy Coated

Length

Height

Gauge

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Duct Adapter Type

Pipe-to-Duct

Performance

Corrosion Resistant

Export Control Classification Number (ECCN)

RoHS

REACH

DFARS Specialty Metals

For System Type

End Construction

Maximum Temperature

124 Products

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.

Duct

Pair with compatible fittings and accessories.

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

					Galvanized Steel
Wd.	Ht.	Lg., ft.	Ga.	Includes		Each



	8"	8"	4	28	Two Drive Brackets, Two S-Brackets	1964K81	000000


	10"	8"	4	28	Two Drive Brackets, Two S-Brackets	1964K82	00000
	12"	8"	4	28	Two Drive Brackets, Two S-Brackets	1964K83	00000
	14"	8"	4	28	Two Drive Brackets, Two S-Brackets	1964K84	00000

90° Elbow Connectors

Horizontal Elbow

Vertical Elbow

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
	Wd.	Ht.	Ga.		Each
Horizontal Elbow



		8"	8"	28	1964K31	000000


		10"	8"	28	1964K32	00000
		12"	8"	28	1964K33	00000
		14"	8"	28	1964K34	00000


		Vertical Elbow



				8"	8"	28	1964K51	00000


				10"	8"	28	1964K52	00000
				12"	8"	28	1964K53	00000
				14"	8"	28	1964K54	00000

45° Elbow Connectors

Horizontal Elbow

Vertical Elbow

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
	Wd.	Ht.	Ga.		Each
Horizontal Elbow



		8"	8"	28	1964K21	000000


		10"	8"	28	1964K22	00000
		12"	8"	28	1964K23	00000
		14"	8"	28	1964K24	00000


		Vertical Elbow



				8"	8"	28	1964K41	00000


				10"	8"	28	1964K42	00000
				12"	8"	28	1964K43	00000
				14"	8"	28	1964K44	00000

Straight Reducers

Shown Installed

Image of Product. Front orientation. Duct and Fittings. Rectangular Duct and Fittings, Straight Reducers.

Transition between ducts of different sizes. These reducers decrease duct width by 2". Cut a hole in the smaller duct to fit the reducer and secure it with tapping screws.

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

			Galvanized Steel
Wd.	Ht.	Ga.		Each



	2"	8"	28	1964K12	000000

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	1964K61	000000


	10"	8"	28	1964K62	00000
	12"	8"	28	1964K63	00000
	14"	8"	28	1964K64	00000

End Caps

Cover unused duct openings to prevent air leaks. 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
Wd.	Ht.	Ga.		Each



	8"	8"	28	1964K71	00000


	10"	8"	28	1964K72	0000
	12"	8"	28	1964K73	00000
	14"	8"	28	1964K74	00000

Duct Turning Vanes

Shown Cut and Assembled

Turning Vanes—Guide air smoothly around sharp bends. These turning vanes improve airflow efficiency by reducing turbulence and pressure loss. Cut vanes to size and pair with rails. Mount assembled vanes inside duct using tapping screws.

Turning Vane Rails—Mounting tabs hold vanes in place. Cut rails to length.

						Galvanized Steel
	Wd.	Ht.	Lg., ft.	Rail Mounting Tab Spacing	Ga.		Each
Turning Vanes



		2 7/8"	1"	6	—	26	1000K5	000000


		5 5/8"	1 7/8"	6	—	24	1000K6	00000


		Turning Vane Rails



				4 1/2"	—	6	2 1/2"	24	1000K2	00000


				7 3/8"	—	6	3 1/4"	24	1000K3	00000

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

Open Duct

Pair with compatible fittings and accessories.

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

Open Duct—Easier to cut with snips than closed duct, so it’s good for repairing or retrofitting an existing system. Snap the seams together by hand—no tools required.

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







				Open Duct

				4	4"	3 7/8"	28	1766K49	000000

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



	10	10"	28	1766K96	000000

Straight Reducers

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



		14	10	10"	13 7/8"	28	2013K59	000000


		14	12	12"	13 7/8"	28	2013K61	00000
		16	14	14"	15 7/8"	28	2013K63	00000

45° Wye Reducers

Female × Male × Male

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.

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



		12	10	10	12"	9 7/8"	9 7/8"	28	1766K845	0000000


		14	10	10	14"	9 7/8"	9 7/8"	28	1766K846	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.

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	2015K56	00000


		4	—	3 7/8"	28	2015K52	0000
		5	—	4 7/8"	28	2015K57	0000
		6	—	5 7/8"	28	2015K46	0000
		8	—	7 7/8"	28	2015K54	0000
		10	—	9 7/8"	28	2015K58	0000
		12	—	11 7/8"	28	2015K59	00000
		14	—	13 7/8"	28	2015K61	00000
		16	—	15 7/8"	28	2015K62	00000
		18	—	17 7/8"	28	2015K63	00000
		20	—	19 7/8"	28	2015K64	00000


		Female



				3	3"	—	28	2015K36	0000


				4	4"	—	28	2015K32	0000
				5	5"	—	28	2015K37	0000
				6	6"	—	28	2015K45	0000
				8	8"	—	28	2015K34	0000
				10	10"	—	28	2015K38	0000
				12	12"	—	28	2015K39	00000
				14	14"	—	28	2015K41	00000
				16	16"	—	28	2015K42	00000
				18	18"	—	28	2015K43	00000
				20	20"	—	28	2015K51	00000

Duct Airflow Dampers

Standard

Airflow

Damper, Male

Gasketed Airflow Damper

Blade Airflow

Damper

Turn the lever to adjust airflow.

Gasketed Airflow Damper—The blade has a rubber gasket to prevent leaks better than other dampers.

Blade Airflow Damper—The most economical choice, these dampers slide into an existing duct line.

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

							Galvanized Steel
	Duct Size	Dia.	OD	Overall Lg.	Ga.	Gasket Material		Each
Standard Airflow Damper







				Male

				4	—	3 3/4"	4 1/2"	20	—	17355K59	000000


				Gasketed Airflow Damper







								Male

								4	—	3 7/8"	10"	20	Neoprene	2041K31	000000


								Blade Airflow Damper



										4	4"	—	—	28	—	3996K11	0000

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 Galvanized Steel Slide—The body is aluminum to reduce stress on your duct and the slide is galvanized steel for strength. Both components resist rust in wet environments.

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



		4	3 13/16"	5"	9 15/16"	1 7/8"	Locking Screw	1788K12	000000

Duct Downdraft Diverters

Prevent drafts from blowing back into ductwork. An internal cone blocks outside air while allowing air and fumes to vent from your system.

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

			Overall			Galvanized Steel
Duct Size	ID	OD	Dia.	Ht.	Ga.		Each
4	4"	3 7/8"	7 1/4"	11 1/2"	26	1785K12	000000

Gas Chimney Vent Pipe and Fittings

For use with gas-fired equipment, such as boilers and furnaces, these vent pipes and fittings withstand temperatures up to 400° F. Also known as type B gas vents.

To join pipes and connectors, insert a male end into a female end and secure with the included locking band.

Pipes

									Galvanized Steel
	Chimney Pipe Size	Female ID	Male OD	Lg.	Ga.	Construction	Inner Wall Material	Certification		Each
Female × Male



		4	4"	4 1/2"	18"	28	Double Wall	Aluminum	UL Listed	2117K12	000000


		5	5"	5 1/2"	18"	28	Double Wall	Aluminum	UL Listed	2117K13	00000
		6	6"	6 1/2"	18"	28	Double Wall	Aluminum	UL Listed	2117K14	00000
		7	7"	8"	18"	28	Double Wall	Aluminum	UL Listed	2117K15	00000
		8	8"	9"	18"	28	Double Wall	Aluminum	UL Listed	2117K16	00000

Adjustable-Angle Connectors, 45° Elbow to Straight

Image of Product. Front orientation. Chimney Pipe and Fittings. Gas Chimney Vent Pipe and Fittings, Adjustable-Angle Connectors, 45° Elbow to Straight.

Adjustable-angle elbow connectors can be used at an angle or straight.

								Galvanized Steel
	Chimney Pipe Size	Female ID	Male OD	Ga.	Construction	Inner Wall Material	Certification		Each
Female × Male



		7	7"	8"	28	Double Wall	Aluminum	UL Listed	2117K25	000000


		8	8"	9"	28	Double Wall	Aluminum	UL Listed	2117K26	00000

Adjustable-Angle Connectors, 60° Elbow to Straight

Image of Product. Front orientation. Chimney Pipe and Fittings. Gas Chimney Vent Pipe and Fittings, Adjustable-Angle Connectors, 60° Elbow to Straight.

Adjustable-angle elbow connectors can be used at an angle or straight.

								Galvanized Steel
	Chimney Pipe Size	Female ID	Male OD	Ga.	Construction	Inner Wall Material	Certification		Each
Female × Male



		4	4"	4 1/2"	28	Double Wall	Aluminum	UL Listed	2117K27	000000


		5	5"	5 1/2"	28	Double Wall	Aluminum	UL Listed	2117K28	00000
		6	6"	6 1/2"	28	Double Wall	Aluminum	UL Listed	2117K29	00000

Tee Connectors

								Galvanized Steel
	Chimney Pipe Size	Female ID	Male OD	Ga.	Construction	Inner Wall Material	Certification		Each
Female × Female × Male



		4	4"	4 1/2"	28	Double Wall	Aluminum	UL Listed	2117K32	000000


		5	5"	5 1/2"	28	Double Wall	Aluminum	UL Listed	2117K33	00000
		6	6"	6 1/2"	28	Double Wall	Aluminum	UL Listed	2117K34	00000
		8	8"	9"	28	Double Wall	Aluminum	UL Listed	2117K36	000000

Rain Caps

				Aluminum
Chimney Pipe Size	OD	Ga.	Certification		Each



	4	4"	28	UL Listed	2117K42	000000


	5	5"	28	UL Listed	2117K43	00000
	6	6"	28	UL Listed	2117K44	00000
	7	7"	28	UL Listed	2117K45	00000
	8	8"	28	UL Listed	2117K46	00000

Roof Flashings

Roof flashing requires a storm collar (sold separately).

				Steel
Chimney Pipe Size	ID	For Max. Roof Pitch	Ga.		Each



	4	4 1/2"	6/12	28	2117K52	000000


	5	5 1/2"	6/12	28	2117K53	00000
	6	6 1/2"	6/12	28	2117K54	00000
	7	8"	6/12	28	2117K55	00000
	8	9"	6/12	28	2117K56	00000

Storm Collars

			Steel
Chimney Pipe Size	ID	Ga.		Each



	4	4 1/2"	28	2117K62	00000


	5	5 1/2"	28	2117K63	00000
	6	6 1/2"	28	2117K64	00000
	7	8"	28	2117K65	00000
	8	9"	28	2117K66	00000

High-Temperature Chimney Vent Pipe and Fittings

Built to withstand temperatures up to 1000° F, these vent pipes and fittings are for use with boilers, furnaces, stoves, and other equipment that is fired by gas, oil, wood, or coal.

To join pipes and connectors, twist a male end into a female end and secure with the included locking band.

Pipes

									18" Long 304 Stainless Steel		36" Long 304 Stainless Steel
	Chimney Pipe Size	Female ID	Male OD	Ga.	Construction	Insulation Thk.	Includes	Certification		Each		Each
Female × Male



		6	6"	8"	28	Double Wall	1"	Locking Band	UL Listed	1716K16	0000000	1716K136	0000000


		8	8"	10"	28	Double Wall	1"	Locking Band	UL Listed	1716K17	000000	1716K137	000000
		10	10"	12"	28	Double Wall	1"	Locking Band	UL Listed	1716K18	000000	1716K138	000000

Tee Connectors

									304 Stainless Steel
	Chimney Pipe Size	Female ID	Male OD	Ga.	Construction	Insulation Thk.	Includes	Certification		Each
Female × Female × Male



		6	6"	8"	28	Double Wall	1"	Locking Band, Removable Cap	UL Listed	1716K26	0000000


		8	8"	10"	28	Double Wall	1"	Locking Band, Removable Cap	UL Listed	1716K27	000000
		10	10"	12"	28	Double Wall	1"	Locking Band, Removable Cap	UL Listed	1716K28	000000

Adapters

Adapters connect pipes to duct.

		Male OD						Painted 430 Stainless Steel		430 Stainless Steel
	Chimney Pipe Size	(A)	(B)	Ga.	Color	Duct Adapter Type	Certification		Each		Each
Male × Male



		6	5 15/16"	8"	28	Black	Pipe-to-Duct	UL Listed	1716K56	000000	———	0


		8	7 15/16"	10"	28	Black	Pipe-to-Duct	UL Listed	1716K57	00000	———	0
		10	9 15/16"	12"	28	—	Pipe-to-Duct	UL Listed	———	0	1716K58	0000000

Rain Caps

			304 Stainless Steel
Chimney Pipe Size	Ga.	Certification		Each



	6	28	UL Listed	1716K46	0000000


	8	28	UL Listed	1716K47	000000
	10	28	UL Listed	1716K48	000000

Roof Flashings

				Aluminum Zinc Alloy-Coated Steel
Chimney Pipe Size	For Max. Roof Pitch	Ga.	Includes		Each



	6	6/12	28	Storm Collar	1716K711	0000000


	8	6/12	28	Storm Collar	1716K8	000000
	10	6/12	28	Storm Collar	1716K9	000000

Storm Collars

		Aluminum Zinc Alloy-Coated Steel
Chimney Pipe Size	Ga.		Each



	6	28	1716K96	000000


	8	28	1716K97	00000
	10	28	1716K98	00000

Oval Duct and Fittings

When rectangular duct is too large, oval duct fits into the tightest spaces. It’s about half the height of rectangular duct and the shape creates more efficient airflow. Components press-fit together.

90° Elbow Register Boots

Create an angled airflow path from duct to vents or registers. These boots are commonly used with heating and cooling systems to deliver air through walls and ceilings.

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

	Female End		Opening			Galvanized Steel
Duct Size	Oval Wd.	Oval Ht.	Wd.	Lg.	Ga.		Each



	6	7 1/2"	3 1/4"	4"	10"	28	4354N41	000000


	7	9 1/8"	3 3/4"	4"	10"	28	4354N42	00000

Airflow Dampers

Blade Airflow

Damper

The simplest, most reliable way to regulate airflow in standard duct. Turn the lever to adjust the blade.

Blade Airflow Damper—The most economical choice, these dampers slide into the end of duct. Drill a hole for the damper's bolt and remove the handle. Place the damper inside duct, insert the bolt through the hole, and reattach the handle.

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

				Galvanized Steel
	Duct Size	Dia.	Ga.		Each
Blade Airflow Damper



		4	4"	28	3996K11	00000


		5	5"	28	3996K14	0000
		6	6"	28	3996K17	0000
		7	7"	28	3996K2	00000
		8	8"	28	3996K23	00000