McMaster-Carr

Search Results

	Trade Size Trade Size

	Shape Shape


Straight	Adjustable- Angle Elbow

Cap	90° Elbow

45° Elbow	Wye

Tee

	ID ID

	OD OD

	Component Component

	Material Material

Steel

Aluminum

Stainless Steel

	Gauge Gauge

	End Construction End Construction

Crimped

Plain

Tapered

	Gender Gender

Female

Male

	Vent Type Vent Type

Exhaust

Intake

	Length Length

2 ft.

5 ft.

	Blade Material Blade Material

Steel

Aluminum

	Opening Length Opening Length

10"

12"

	Opening Width Opening Width

2 1/4"

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323 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.

Duct

Open Duct

Open duct can be cut with snips prior to installation. The seam snaps together without tools.

					Galvanized Steel			Aluminum
Trade Size	Female ID	Male OD	Gauge	End Construction		2 ft.	5 ft.		2 ft.	5 ft.
Open Duct
3	3"	2 7/8"	26	Crimped	0000000	00000	00	000000	00000	000000
4	4"	3 7/8"	__	Crimped	000000	0000	000000	000000	00	00
4	4"	3 7/8"	26	Crimped	000000	00	00	000000	0000	00000
5	5"	4 7/8"	26	Crimped	000000	0000	00000	000000	00000	00000
6	6"	5 7/8"	26	Crimped	000000	00000	00000	00000000	00000	00000
7	7"	6 7/8"	26	Crimped	000000	00000	00000	000000	00000	00000
8	8"	7 7/8"	26	Crimped	000000	00000	00000	000000	00000	00000
9	9"	8 7/8"	26	Crimped	000000	00000	00000	000000	00000	00000
10	10"	9 7/8"	26	Crimped	000000	00000	00000	000000	00000	00000
12	12"	11 7/8"	26	Crimped	000000	00000	00000	000000	00000	000000
14	14"	13 7/8"	26	Crimped	000000	00000	00000	000000	00	00
16	16"	15 7/8"	26	Crimped	0000000	00000	00	000000	00	00
18	18"	17 7/8"	26	Crimped	0000000	00000	00	000000	00	00
20	20"	19 7/8"	24	Crimped	0000000	00000	00	000000	00	00
22	22"	21 7/8"	24	Crimped	0000000	000000	00	000000	00	00
24	24"	23 7/8"	24	Crimped	0000000	000000	00	000000	00	00

90° Elbow Connectors

					304 Stainless Steel
Trade Size	Female ID	Male OD	Features	End Construction	Gauge		Each
3	3"	2 7/8"	Welded Seams	Tapered	20	00000000	0000000

45° Elbow Connectors

45° Elbow Connector with Welded Seams

45° Elbow Connector

Connectors with welded seams prevent leaks.

Galvanized Steel
Trade Size	Female ID	Male OD	Features	End Construction	Gauge		Each
3	3"	2 7/8"	Welded Seams	Tapered	20	0000000	000000
4	4"	3 7/8"	Welded Seams	Tapered	20	0000000	00000
5	5"	4 7/8"	Welded Seams	Tapered	20	0000000	000000
6	6"	5 7/8"	Welded Seams	Tapered	20	0000000	000000
7	7"	6 7/8"	Welded Seams	Tapered	20	0000000	000000
8	8"	7 7/8"	Welded Seams	Tapered	20	0000000	000000
10	10"	9 7/8"	Welded Seams	Tapered	20	0000000	000000
12	12"	11 7/8"	Welded Seams	Tapered	20	0000000	000000
18	18"	17 7/8"	__	Crimped	24	00000000	00000
20	20"	19 7/8"	__	Crimped	24	00000000	00000
22	22"	21 7/8"	__	Crimped	24	00000000	000000
24	24"	23 7/8"	__	Crimped	24	00000000	000000
304 Stainless Steel
3	3"	2 7/8"	Welded Seams	Tapered	20	00000000	000000

Adjustable-Angle Elbow Connectors, 90° Elbow to Straight

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

Galvanized Steel
Trade Size	Female ID	Male OD	Gauge	End Construction		Each
3	3"	2 7/8"	26	Crimped	0000000	00000
4	4"	3 7/8"	26	Crimped	0000000	0000
5	5"	4 7/8"	26	Crimped	0000000	00000
6	6"	5 7/8"	26	Crimped	0000000	00000
7	7"	6 7/8"	26	Crimped	0000000	00000
8	8"	7 7/8"	26	Crimped	0000000	00000
9	9"	8 7/8"	26	Crimped	0000000	00000
10	10"	9 7/8"	26	Crimped	0000000	00000
12	12"	11 7/8"	26	Crimped	0000000	00000
14	14"	13 7/8"	24	Crimped	0000000	00000
16	16"	15 7/8"	24	Crimped	0000000	00000
18	18"	17 7/8"	24	Crimped	0000000	00000
20	20"	19 7/8"	24	Crimped	0000000	00000
22	22"	21 7/8"	24	Crimped	0000000	000000
24	24"	23 7/8"	24	Crimped	0000000	000000
Aluminum
3	3"	2 7/8"	26	Crimped	0000000	0000
4	4"	3 7/8"	26	Crimped	0000000	0000
5	5"	4 7/8"	26	Crimped	0000000	0000

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
Trade Size	Female ID	Male OD	Gauge	End Construction		Each

Straight Connectors

Straight connectors wrap around two female duct ends to join them.

				Galvanized Steel
Trade Size	Female ID	Gauge	End Construction		Each

Tee Connectors

Female

Female × Female × Male

Tee connectors join or split runs of duct.

Trade Size	Female ID	Male OD	Gauge	End Construction		Each

Straight Reducers, Female × Male

Reducers connect duct with different diameters.

Trade Size
(A)	(B)	Female ID (A)	Male OD (B)	End Construction	Gauge		Each

Straight Reducers, Male × Female

Reducers connect duct with different diameters.

Trade Size
(A)	(B)	Male OD (A)	Female ID (B)	Gauge	End Construction		Each

45° Wye Reducers

Female × Male × Male

Male × Female × Female

Reducers connect duct with different diameters.

Trade Size			Female ID			Male OD					Galvanized Steel
(A)	(B)	(C)	(A)	(B)	(C)	(A)	(B)	(C)	Gauge	End Construction		Each

Tee Reducers

Female × Female × Male

Female × Male × Male

Reducers connect duct with different diameters.

Trade Size			Female ID		Male OD
(A)	(B)	(C)	(A)	(B)	(B)	(C)	Gauge	End Construction		Each

Airflow Dampers, Female × Male

Airflow dampers control airflow through duct.

					Aluminum
Trade Size	Female ID	Male OD	Gauge	End Construction	Blade Material		Each

Airflow Dampers, Male

Standard

Airflow dampers control airflow through duct.

				Galvanized Steel
Trade Size	Male OD	Gauge	End Construction	Blade Material		Each

Damper Blades

Add damper blades to duct to control airflow.

				Galvanized Steel
Trade Size	Female ID	Gauge	Includes		Each

Damper Hardware

Attach damper hardware to a sheet metal blade to create a damper. A threaded mount acts as the pivot.

	Galvanized Steel
For Max. Damper Blade Thick.		Each

Vent Caps

Exhaust Vent

Intake Vent

Trade Size	Female ID	Male OD	Includes	End Construction	Gauge		Each

90° Elbow Register Boots

		Opening				Galvanized Steel
Trade Size	Female ID	Lg.	Wd.	Gauge	End Construction		Each

Straight Register Boots

		Opening				Galvanized Steel
Trade Size	Female ID	Lg.	Wd.	Gauge	End Construction		Each

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
Trade Size	Male OD	Gauge	End Construction		Each

Straight Collars

Female

Male

Male with Gasket

Collars create branches from a rectangular duct. Cut a hole in the duct and use a collar to attach standard duct. Collar with polyethylene gasket is self-sealing because the gasket has an adhesive back. The flange has 1/8" dia. mounting holes.

Trade Size	Female ID	Male OD	End Construction	Gauge		Each

Downdraft Diverters

Downdraft diverters have an internal cone that prevents drafts from extinguishing pilot lights.

					Galvanized Steel
Trade Size	Female ID	Male OD	Gauge	End Construction		Each

Ball Joints

Ball joints create adjustable-angle connections. They are often used to connect duct to duct hose. Hold duct hose in place with a hose clamp (not included).

					Galvanized Steel
Trade Size	Female ID	Male OD	Gauge	End Construction		Each

Rain Caps

Galvanized Steel

			Galvanized Steel
Trade Size	Female ID	End Construction	Gauge		Each

End Caps

Female

Male

					Galvanized Steel
Trade Size	Female ID	Male OD	Gauge	End Construction		Each

Terms and Conditions and Privacy Policy

About Duct Connections

Standard Duct and Fittings