Duct Elbows | McMaster-Carr

	Shape Shape


90° Elbow	Adjustable- Angle Elbow

Straight	45° Elbow

30° Elbow	60° Elbow

	Duct Size Duct Size

	Material Material

	Finish Finish

Galvanized

PVC Coated

	ID ID

	OD OD

	Connection Type Connection Type

	Press Fit
	Quick- Disconnect Clamp
	Interlocking Bracket

	Gauge Gauge

	End Construction End Construction

	Component Component

Connector

Collar

	Gender Gender

Male

Female

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Width Width

	Elbow Orientation Elbow Orientation

Horizontal

Vertical

	For System Type For System Type

Natural Gas

Propane

	Chimney Pipe Size Chimney Pipe Size

	Opening Width Opening Width

2 1/4"

	Opening Length Opening Length

233 Products

About Duct Connections

No need for clamps or connectors—duct and fittings press-fit together. Male ends are crimped or tapered, making them slightly smaller than a female end for simple assembly.

Galvanized steel has good corrosion resistance. Aluminum is more lightweight than steel and stainless steel and has good corrosion resistance. 304 stainless steel is more corrosion resistant than steel and aluminum.

For technical drawings and 3-D models, click on a part number.

90° Elbow Connectors

Connectors with welded seams prevent leaks.

						Galvanized Steel		304 Stainless Steel
Duct Size	Female ID	Male OD	Features	End Construction	Gauge		Each		Each
3	3"	2 7/8"	Welded Seams	Tapered	20	0000000	0000000	00000000	0000000
4	4"	3 7/8"	Welded Seams	Tapered	20	0000000	000000	00000000	000000
5	5"	4 7/8"	Welded Seams	Tapered	20	0000000	000000	00000000	000000
6	6"	5 7/8"	Welded Seams	Tapered	20	0000000	000000	00000000	000000
7	7"	6 7/8"	Welded Seams	Tapered	20	0000000	000000	00000000	000000
8	8"	7 7/8"	Welded Seams	Tapered	20	0000000	000000	00000000	000000
10	10"	9 7/8"	Welded Seams	Tapered	20	0000000	000000	00000000	000000
12	12"	11 7/8"	Welded Seams	Tapered	20	0000000	000000	00000000	000000

45° Elbow Connectors

45° Elbow Connector with Welded Seams

45° Elbow Connector

Connectors with welded seams prevent leaks.

					Galvanized Steel			304 Stainless Steel
Duct Size	Female ID	Male OD	Features	End Construction	Gauge		Each	Gauge		Each
3	3"	2 7/8"	Welded Seams	Tapered	20	0000000	000000	20	00000000	0000000
4	4"	3 7/8"	Welded Seams	Tapered	20	0000000	000000	20	00000000	000000
5	5"	4 7/8"	Welded Seams	Tapered	20	0000000	000000	20	00000000	000000
6	6"	5 7/8"	Welded Seams	Tapered	20	0000000	000000	20	00000000	000000
7	7"	6 7/8"	Welded Seams	Tapered	20	0000000	000000	20	00000000	000000
8	8"	7 7/8"	Welded Seams	Tapered	20	0000000	000000	20	00000000	000000
10	10"	9 7/8"	Welded Seams	Tapered	20	0000000	000000	20	00000000	000000
12	12"	11 7/8"	Welded Seams	Tapered	20	0000000	000000	20	00000000	000000
18	18"	17 7/8"	__	Crimped	24	00000000	000000	__	000000	00
20	20"	19 7/8"	__	Crimped	24	00000000	000000	__	000000	00
22	22"	21 7/8"	__	Crimped	24	00000000	000000	__	000000	00
24	24"	23 7/8"	__	Crimped	24	00000000	000000	__	000000	00

Adjustable-Angle Elbow Connectors, 90° Elbow to Straight

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

					Galvanized Steel		Aluminum		304 Stainless Steel
Duct Size	Female ID	Male OD	Gauge	End Construction		Each		Each		Each
3	3"	2 7/8"	26	Crimped	0000000	000000	0000000	00000	0000000	000000
4	4"	3 7/8"	26	Crimped	0000000	00000	0000000	0000	0000000	00000
5	5"	4 7/8"	26	Crimped	0000000	00000	0000000	00000	0000000	00000
6	6"	5 7/8"	26	Crimped	0000000	00000	0000000	00000	0000000	00000
7	7"	6 7/8"	26	Crimped	0000000	00000	0000000	00000	0000000	00000
8	8"	7 7/8"	26	Crimped	0000000	00000	0000000	00000	0000000	000000
9	9"	8 7/8"	26	Crimped	0000000	00000	000000	00	000000	00
10	10"	9 7/8"	26	Crimped	0000000	00000	0000000	00000	0000000	000000
12	12"	11 7/8"	26	Crimped	0000000	00000	0000000	00000	0000000	000000
14	14"	13 7/8"	24	Crimped	0000000	00000	000000	00	000000	00
16	16"	15 7/8"	24	Crimped	0000000	000000	000000	00	000000	00
18	18"	17 7/8"	24	Crimped	0000000	000000	000000	00	000000	00
20	20"	19 7/8"	24	Crimped	0000000	000000	000000	00	000000	00
24	24"	23 7/8"	24	Crimped	0000000	000000	000000	00	000000	00

Adjustable-Angle Elbow Connectors, 45° Elbow to Straight

45° Elbow Connector

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

					Galvanized Steel
Duct Size	Female ID	Male OD	Gauge	End Construction		Each
3	3"	2 7/8"	26	Crimped	00000000	000000
4	4"	3 7/8"	26	Crimped	00000000	00000
5	5"	4 7/8"	26	Crimped	00000000	00000
6	6"	5 7/8"	26	Crimped	00000000	00000
7	7"	6 7/8"	26	Crimped	00000000	00000
8	8"	7 7/8"	26	Crimped	00000000	00000
9	9"	8 7/8"	26	Crimped	00000000	00000
10	10"	9 7/8"	26	Crimped	00000000	00000
12	12"	11 7/8"	26	Crimped	00000000	00000
14	14"	13 7/8"	24	Crimped	00000000	00000
16	16"	15 7/8"	24	Crimped	00000000	000000

90° Elbow Register Boots

		Opening				Galvanized Steel
Duct Size	Female ID	Lg.	Wd.	Gauge	End Construction		Each
6	6"	10"	2 1/4"	30	Plain	0000000	000000
6	6"	10"	4"	30	Plain	0000000	00000
6	6"	12"	2 1/4"	30	Plain	0000000	00000
6	6"	12"	4"	30	Plain	0000000	00000

90° Elbow Collars

Collars create branches from a rectangular duct. Cut a hole in the duct and use a collar to attach standard duct.

				Galvanized Steel
Duct Size	Male OD	Gauge	End Construction		Each
5	4 7/8"	30	Crimped	0000000	000000
6	5 7/8"	30	Crimped	0000000	00000
7	6 7/8"	30	Crimped	0000000	00000
8	7 7/8"	30	Crimped	0000000	00000

Crush-Resistant Spiral Duct and Fittings

A spiral seam makes this duct strong and rigid. Fittings have male ends with a slightly smaller diameter to press-fit into duct.

Galvanized steel has good corrosion resistance. PVC-coated steel combines the strength of steel with the corrosion resistance of plastic. 304 stainless steel is more corrosion resistant than steel.

For technical drawings and 3-D models, click on a part number.

90° Elbow Connectors

Galvanized Steel
Duct Size	Male OD	Gauge	End Construction		Each
3	2 7/8"	24	Spiral	0000000	000000
4	3 7/8"	24	Spiral	0000000	00000
5	4 7/8"	24	Spiral	0000000	00000
6	5 7/8"	24	Spiral	0000000	00000
8	7 7/8"	24	Spiral	0000000	00000
10	9 7/8"	24	Spiral	0000000	00000
12	11 7/8"	24	Spiral	0000000	000000
14	13 7/8"	24	Spiral	0000000	000000
16	15 7/8"	24	Spiral	0000000	000000
PVC-Coated Steel
4	3 7/8"	24	Plain	00000000	00000
5	4 7/8"	24	Plain	00000000	00000
6	5 7/8"	24	Plain	00000000	000000
7	6 7/8"	24	Plain	00000000	000000
8	7 7/8"	24	Plain	00000000	000000
9	8 7/8"	24	Plain	00000000	000000
10	9 7/8"	24	Plain	00000000	000000
12	11 7/8"	24	Plain	00000000	000000
304 Stainless Steel
4	3 7/8"	20	Plain	0000000	00000
6	5 7/8"	20	Plain	0000000	000000
8	7 7/8"	20	Plain	0000000	000000
10	9 7/8"	20	Plain	0000000	000000

45° Elbow Connectors

Galvanized Steel
Duct Size	Male OD	Gauge	End Construction		Each
3	2 7/8"	24	Spiral	00000000	000000
4	3 7/8"	24	Spiral	00000000	00000
5	4 7/8"	24	Spiral	00000000	00000
6	5 7/8"	24	Spiral	00000000	00000
8	7 7/8"	24	Spiral	00000000	00000
10	9 7/8"	24	Spiral	00000000	00000
12	11 7/8"	24	Spiral	00000000	00000
14	13 7/8"	24	Spiral	00000000	00000
16	15 7/8"	24	Spiral	00000000	000000
PVC-Coated Steel
4	3 7/8"	24	Plain	00000000	00000
5	4 7/8"	24	Plain	00000000	00000
6	5 7/8"	24	Plain	00000000	00000
7	6 7/8"	24	Plain	00000000	00000
8	7 7/8"	24	Plain	00000000	00000
9	8 7/8"	24	Plain	00000000	000000
10	9 7/8"	24	Plain	00000000	000000
12	11 7/8"	24	Plain	00000000	000000
304 Stainless Steel
4	3 7/8"	20	Plain	0000000	00000
6	5 7/8"	20	Plain	0000000	00000
8	7 7/8"	20	Plain	0000000	000000
10	9 7/8"	20	Plain	0000000	000000

Quick-Disconnect Duct and Fittings

Join duct and fittings with quick-release clamps for faster disassembly and cleanout than other duct systems.

Galvanized steel has good corrosion resistance. 304 stainless steel is the most corrosion resistant.

For technical drawings and 3-D models, click on a part number.

90° Elbow Connectors

			Galvanized Steel				304 Stainless Steel
Duct Size	ID	End Construction	Style	Gauge		Each	Style	Gauge		Each
4	3 7/8"	Rolled	A	24	0000000	000000	A	14	00000000	0000000
5	4 7/8"	Rolled	A	24	0000000	00000	A	14	00000000	000000
6	5 7/8"	Rolled	A	24	0000000	000000	A	14	00000000	000000
7	6 7/8"	Rolled	A	24	00000000	000000	B	22	00000000	000000
8	7 7/8"	Rolled	B	22	00000000	000000	B	22	00000000	000000
9	8 7/8"	Rolled	B	22	00000000	000000	B	22	00000000	000000
10	9 7/8"	Rolled	B	22	00000000	000000	B	22	00000000	000000
12	12"	Rolled	B	22	00000000	000000	B	22	00000000	000000
14	13 15/16"	Rolled	B	20	00000000	000000	B	20	00000000	000000
16	16"	Rolled	B	20	00000000	000000	B	20	00000000	000000

45° Elbow Connectors

			Galvanized Steel				304 Stainless Steel
Duct Size	ID	End Construction	Style	Gauge		Each	Style	Gauge		Each
4	3 7/8"	Rolled	A	24	00000000	000000	A	14	00000000	0000000
5	4 7/8"	Rolled	A	24	00000000	00000	A	14	00000000	000000
6	5 7/8"	Rolled	A	24	00000000	00000	A	14	00000000	000000
7	6 7/8"	Rolled	A	24	00000000	000000	B	22	00000000	000000
8	7 7/8"	Rolled	B	22	00000000	000000	B	22	00000000	000000
9	8 7/8"	Rolled	B	22	00000000	000000	__	__	000000	00
10	9 7/8"	Rolled	B	22	00000000	000000	B	22	00000000	000000
12	12"	Rolled	B	22	00000000	000000	B	22	00000000	000000
14	13 15/16"	Rolled	B	20	00000000	000000	B	20	00000000	000000
16	16"	Rolled	B	20	00000000	000000	B	20	00000000	000000

30° Elbow Connectors

			Galvanized Steel				304 Stainless Steel
Duct Size	ID	End Construction	Style	Gauge		Each	Style	Gauge		Each
4	3 7/8"	Rolled	A	24	00000000	000000	A	14	00000000	0000000
5	4 7/8"	Rolled	A	24	00000000	00000	A	14	00000000	000000
6	5 7/8"	Rolled	A	24	00000000	000000	A	14	00000000	000000
7	6 7/8"	Rolled	A	24	00000000	000000	__	__	000000	00
8	7 7/8"	Rolled	B	22	00000000	000000	B	22	00000000	000000
9	8 7/8"	Rolled	B	22	00000000	000000	__	__	000000	00
10	9 7/8"	Rolled	B	22	00000000	000000	B	22	00000000	000000
12	12"	Rolled	B	22	00000000	000000	B	22	00000000	000000
14	13 15/16"	Rolled	B	20	00000000	000000	B	20	00000000	000000
16	16"	Rolled	B	20	00000000	000000	B	20	00000000	000000

Chemical-Resistant Duct and Fittings

Made of PVC plastic to withstand acids, alkalies, salts, and other corrosive vapors and fumes. Use PVC pipe cement (not included) to secure components. Fittings have female ends with a slightly larger diameter to press-fit over duct.

For technical drawings and 3-D models, click on a part number.

90° Elbow Connectors

			PVC Plastic
Duct Size	Female ID	Color		Each
4	4 1/2"	Gray	0000000	000000
6	6 5/8"	Gray	0000000	000000
8	8 5/8"	Gray	0000000	000000
10	10 3/4"	Gray	0000000	000000
12	12 3/4"	Gray	0000000	000000
14	14"	Gray	0000000	000000

45° Elbow Connectors

			PVC Plastic
Duct Size	Female ID	Color		Each
4	4 1/2"	Gray	00000000	000000
6	6 5/8"	Gray	0000000	00000
8	8 5/8"	Gray	0000000	000000
10	10 3/4"	Gray	0000000	000000
12	12 3/4"	Gray	0000000	000000
14	14"	Gray	0000000	000000

Sure-Seal Spiral Duct and Fittings

Fittings have gaskets which create a tight seal—you don't need to seal joints with coating or tape. Fittings have male ends with a slightly smaller diameter to press-fit into duct. These duct and fittings are compatible with Crush-Resistant Spiral Duct and Fittings.

For technical drawings and 3-D models, click on a part number.

90° Elbow Connectors

				Galvanized Steel
Duct Size	Male OD	Gauge	Gasket Material		Each
4	3 7/8"	24	EPDM Rubber	0000000	000000
6	5 7/8"	24	EPDM Rubber	0000000	00000
8	7 7/8"	24	EPDM Rubber	0000000	00000
10	9 7/8"	24	EPDM Rubber	0000000	00000
12	11 7/8"	24	EPDM Rubber	0000000	00000

45° Elbow Connectors

				Galvanized Steel
Duct Size	Male OD	Gauge	Gasket Material		Each
4	3 7/8"	24	EPDM Rubber	0000000	000000
6	5 7/8"	24	EPDM Rubber	0000000	00000
8	7 7/8"	24	EPDM Rubber	0000000	00000
10	9 7/8"	24	EPDM Rubber	0000000	00000
12	11 7/8"	24	EPDM Rubber	0000000	00000

Rectangular Duct and Fittings

Often used in tight spaces, such as in walls and ceilings, rectangular duct allows you to select larger sizes without increasing duct height. Duct and fittings have interconnecting ends that lock together with brackets.

For technical drawings and 3-D models, click on a part number.

90° Elbow Connectors

Horizontal Elbow

Vertical Elbow

			Galvanized Steel
			Horizontal Elbow		Vertical Elbow
Wd.	Ht.	Gauge		Each		Each
8"	8"	28	0000000	000000	0000000	000000
10"	8"	28	0000000	00000	0000000	00000
12"	8"	28	0000000	00000	0000000	00000
14"	8"	28	0000000	00000	0000000	00000
16"	8"	26	0000000	00000	0000000	00000
20"	8"	26	0000000	00000	0000000	00000
24"	8"	26	0000000	00000	0000000	00000

45° Elbow Connectors

Horizontal Elbow

Vertical Elbow

			Galvanized Steel
			Horizontal Elbow		Vertical Elbow
Wd.	Ht.	Gauge		Each		Each
8"	8"	28	0000000	000000	0000000	000000
10"	8"	28	0000000	00000	0000000	00000
12"	8"	28	0000000	00000	0000000	00000
14"	8"	28	0000000	00000	0000000	00000

Gas Chimney Vents 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.

For technical drawings and 3-D models, click on a part number.

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	Gauge	Construction	Inner Wall Material	Specifications Met		Each
7	7"	8"	28	Double Wall	Aluminum	UL Listed	0000000	000000
8	8"	9"	28	Double Wall	Aluminum	UL Listed	0000000	00000

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	Gauge	Construction	Inner Wall Material	Specifications Met		Each
4	4"	4 1/2"	28	Double Wall	Aluminum	UL Listed	0000000	000000
5	5"	5 1/2"	28	Double Wall	Aluminum	UL Listed	0000000	00000
6	6"	6 1/2"	28	Double Wall	Aluminum	UL Listed	0000000	00000

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About Duct Connections

Standard Duct and Fittings

Crush-Resistant Spiral Duct and Fittings

Quick-Disconnect Duct and Fittings

Chemical-Resistant Duct and Fittings

Sure-Seal Spiral Duct and Fittings

Rectangular Duct and Fittings

Gas Chimney Vents and Fittings