Dryer Duct Fittings | McMaster-Carr

	Duct Size Duct Size

	Shape Shape


Straight	Adjustable- Angle Elbow

90° Elbow	Cap

45° Elbow	Tee

Wye

	ID ID

	OD OD

	Material Material

Steel

Aluminum

Stainless Steel

	Component Component

	Gauge Gauge

	Gender Gender

Female

Male

	End Construction End Construction

Crimped

Plain

Tapered

	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

	Length Length

2 ft.

5 ft.

	Vent Type Vent Type

Exhaust

Intake

	Blade Material Blade Material

Steel

Aluminum

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

RoHS Compliant

	Opening Length Opening Length

10"

12"

	Opening Width Opening Width

2 1/4"

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274 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
Duct 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	000000	00	0000000	00	000000
4	4"	3 7/8"	__	Crimped	000000	00000	000000	000000	00	00
4	4"	3 7/8"	26	Crimped	000000	00	00	000000	000000	00000
5	5"	4 7/8"	26	Crimped	000000	00000	00000	0000000	00000	00
6	6"	5 7/8"	26	Crimped	000000	00000	00000	00000000	00000	00000
7	7"	6 7/8"	26	Crimped	000000	00000	00000	000000	00	00
8	8"	7 7/8"	26	Crimped	000000	00000	00000	0000000	00	000000
9	9"	8 7/8"	26	Crimped	000000	00000	00000	000000	00	00
10	10"	9 7/8"	26	Crimped	000000	00000	00000	000000	00	00
12	12"	11 7/8"	26	Crimped	000000	00000	00000	000000	00	00
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	000000	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
Duct 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			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	__	000000	00
5	5"	4 7/8"	Welded Seams	Tapered	20	0000000	000000	__	000000	00
6	6"	5 7/8"	Welded Seams	Tapered	20	0000000	000000	__	000000	00
7	7"	6 7/8"	Welded Seams	Tapered	20	0000000	000000	__	000000	00
8	8"	7 7/8"	Welded Seams	Tapered	20	0000000	000000	__	000000	00
10	10"	9 7/8"	Welded Seams	Tapered	20	0000000	000000	__	000000	00
12	12"	11 7/8"	Welded Seams	Tapered	20	0000000	000000	__	000000	00
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
Duct Size	Female ID	Male OD	Gauge	End Construction		Each		Each
3	3"	2 7/8"	26	Crimped	0000000	000000	0000000	00000
4	4"	3 7/8"	26	Crimped	0000000	00000	0000000	0000
5	5"	4 7/8"	26	Crimped	0000000	00000	0000000	00000
6	6"	5 7/8"	26	Crimped	0000000	00000	0000000	00000
7	7"	6 7/8"	26	Crimped	0000000	00000	0000000	00000
8	8"	7 7/8"	26	Crimped	0000000	00000	0000000	00000
9	9"	8 7/8"	26	Crimped	0000000	00000	000000	00
10	10"	9 7/8"	26	Crimped	0000000	00000	0000000	00000
12	12"	11 7/8"	26	Crimped	0000000	00000	0000000	00000
14	14"	13 7/8"	24	Crimped	0000000	00000	000000	00
16	16"	15 7/8"	24	Crimped	0000000	000000	000000	00
18	18"	17 7/8"	24	Crimped	0000000	000000	000000	00
20	20"	19 7/8"	24	Crimped	0000000	000000	000000	00
24	24"	23 7/8"	24	Crimped	0000000	000000	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

Straight Connectors

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

				Galvanized Steel
Duct Size	Female ID	Gauge	End Construction		Each
4	4"	30	Plain	0000000	000000
5	5"	30	Plain	0000000	00000
6	6"	30	Plain	0000000	00000
7	7"	30	Plain	0000000	00000
8	8"	30	Plain	0000000	00000
10	10"	28	Plain	0000000	00000
12	12"	26	Plain	0000000	00000

Tee Connectors

Female

Female × Female × Male

Tee connectors join or split runs of duct.

					Galvanized Steel
Duct Size	Female ID	Male OD	Gauge	End Construction		Each
Female
14	14"	__	26	Crimped	00000000	000000
16	16"	__	26	Crimped	00000000	000000
18	18"	__	26	Crimped	00000000	000000
20	20"	__	26	Crimped	00000000	000000
Female × Female × Male
3	3"	2 7/8"	26	Crimped	0000000	00000
4	4"	3 7/8"	26	Crimped	0000000	00000
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	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

Straight Reducers, Female × Male

Reducers connect duct with different diameters.

Duct Size					Galvanized Steel			Aluminum
(A)	(B)	Female ID (A)	Male OD (B)	End Construction	Gauge		Each	Gauge		Each
4	3	4"	2 15/16"	Crimped	26	0000000	000000	__	000000	00
5	4	5"	3 7/8"	Crimped	26	0000000	00000	__	000000	00
6	4	6"	3 7/8"	Crimped	__	000000	00	24	0000000	000000
6	4	6"	3 15/16"	Crimped	26	0000000	00000	__	000000	00
6	5	6"	4 7/8"	Crimped	26	0000000	00000	__	000000	00
7	4	7"	3 7/8"	Crimped	__	000000	00	24	0000000	00000
7	6	7"	5 7/8"	Crimped	26	0000000	00000	__	000000	00
8	6	8"	5 15/16"	Crimped	26	0000000	00000	__	000000	00
8	7	8"	6 7/8"	Crimped	26	0000000	00000	__	000000	00
9	8	9"	7 15/16"	Crimped	26	0000000	00000	__	000000	00
10	6	10"	5 7/8"	Crimped	26	0000000	00000	__	000000	00
10	7	10"	6 7/8"	Crimped	26	0000000	00000	__	000000	00
10	8	10"	7 7/8"	Crimped	26	0000000	00000	__	000000	00
12	10	12"	9 7/8"	Crimped	26	0000000	00000	__	000000	00
12	6	12"	5 7/8"	Crimped	26	0000000	00000	__	000000	00
12	7	12"	6 7/8"	Crimped	26	0000000	00000	__	000000	00
12	8	12"	7 7/8"	Crimped	26	0000000	00000	__	000000	00

Straight Reducers, Male × Female

Reducers connect duct with different diameters.

Duct Size						Galvanized Steel
(A)	(B)	Male OD (A)	Female ID (B)	Gauge	End Construction		Each
6	4	5 7/8"	4"	26	Crimped	0000000	000000
7	6	6 7/8"	6"	26	Crimped	0000000	00000
8	6	7 7/8"	6"	26	Crimped	0000000	00000
8	7	7 7/8"	7"	26	Crimped	0000000	00000
10	6	9 7/8"	6"	26	Crimped	0000000	00000
10	8	9 7/8"	8"	26	Crimped	0000000	00000
12	10	11 7/8"	10"	26	Crimped	0000000	00000
12	6	11 7/8"	6"	26	Crimped	0000000	00000
12	8	11 7/8"	8"	26	Crimped	0000000	00000
14	10	13 7/8"	10"	28	Crimped	0000000	00000
14	12	13 7/8"	12"	28	Crimped	0000000	00000
16	12	15 7/8"	12"	28	Crimped	0000000	00000
16	14	15 7/8"	14"	28	Crimped	0000000	00000
18	16	17 7/8"	16"	26	Crimped	0000000	00000

45° Wye Reducers

Female × Male × Male

Male × Female × Female

Reducers connect duct with different diameters.

Duct Size			Female ID			Male OD					Galvanized Steel
(A)	(B)	(C)	(A)	(B)	(C)	(A)	(B)	(C)	Gauge	End Construction		Each
Female × Male × Male
12	10	10	12"	__	__	__	9 7/8"	9 7/8"	28	Crimped	00000000	0000000
14	10	10	14"	__	__	__	9 7/8"	9 7/8"	28	Crimped	00000000	000000
16	12	12	16"	__	__	__	11 7/8"	11 7/8"	26	Crimped	00000000	000000
16	14	14	16"	__	__	__	13 7/8"	13 7/8"	26	Crimped	00000000	000000
Male × Female × Female
4	3	3	__	3"	3"	3 7/8"	__	__	26	Crimped	00000000	00000
5	3	4	__	3"	4"	4 7/8"	__	__	26	Crimped	00000000	00000
5	3	5	__	3"	5"	4 7/8"	__	__	26	Crimped	00000000	00000
6	3	4	__	3"	4"	5 7/8"	__	__	26	Crimped	00000000	00000
6	4	4	__	4"	4"	5 7/8"	__	__	26	Crimped	00000000	00000
6	4	5	__	4"	5"	5 7/8"	__	__	26	Crimped	00000000	00000
7	5	6	__	5"	6"	6 7/8"	__	__	26	Crimped	00000000	00000
8	6	6	__	6"	6"	7 7/8"	__	__	26	Crimped	00000000	00000
10	8	8	__	8"	8"	9 7/8"	__	__	26	Crimped	00000000	000000
12	8	8	__	8"	8"	11 7/8"	__	__	26	Crimped	00000000	000000

Tee Reducers

Reducers connect duct with different diameters.

Duct Size				Male OD				Galvanized Steel
(A)	(B)	(C)	Female ID (A)	(B)	(C)	Gauge	End Construction		Each
Female × Male × Male
4	3	4	4"	2 7/8"	3 7/8"	26	Crimped	00000000	000000
5	3	5	5"	2 7/8"	4 7/8"	26	Crimped	0000000	00000
6	3	6	6"	2 7/8"	5 7/8"	26	Crimped	0000000	00000
6	4	6	6"	3 7/8"	5 7/8"	26	Crimped	0000000	00000

Airflow Dampers, Female × Male

Airflow dampers control airflow through duct.

					Aluminum
Duct Size	Female ID	Male OD	Gauge	End Construction	Blade Material		Each
Standard
3	3"	2 7/8"	26	Crimped	Aluminum	0000000	000000
4	4"	3 7/8"	26	Crimped	Aluminum	0000000	00000
6	6"	5 7/8"	26	Crimped	Aluminum	0000000	00000

Airflow Dampers, Male

Standard

Airflow dampers control airflow through duct.

				Galvanized Steel
Duct Size	Male OD	Gauge	End Construction	Blade Material		Each
Standard
4	3 3/4"	20	Plain	Galvanized Steel	00000000	000000
5	4 3/4"	20	Plain	Galvanized Steel	00000000	00000
6	5 3/4"	20	Plain	Galvanized Steel	00000000	00000
7	6 3/4"	20	Plain	Galvanized Steel	00000000	00000
8	7 3/4"	20	Plain	Galvanized Steel	00000000	00000
9	8 3/4"	20	Plain	Galvanized Steel	00000000	000000
10	9 3/4"	20	Plain	Galvanized Steel	00000000	00000
12	11 3/4"	20	Plain	Galvanized Steel	00000000	00000
14	13 3/4"	20	Plain	Galvanized Steel	00000000	00000
16	15 3/4"	20	Plain	Galvanized Steel	00000000	000000
18	17 3/4"	20	Plain	Galvanized Steel	00000000	000000
20	19 3/4"	18	Plain	Galvanized Steel	00000000	000000
22	21 3/4"	18	Plain	Galvanized Steel	00000000	000000
24	23 3/4"	18	Plain	Galvanized Steel	00000000	000000

Damper Blades

Add damper blades to duct to control airflow.

				Galvanized Steel
Duct Size	Female ID	Gauge	Includes		Each
4	4"	28	Handle	0000000	00000
5	5"	28	Handle	0000000	0000
6	6"	28	Handle	0000000	0000
7	7"	28	Handle	000000	00000
8	8"	28	Handle	0000000	00000
9	9"	26	Handle	0000000	0000
10	10"	26	Handle	0000000	00000
12	12"	26	Handle	0000000	00000
14	14"	24	Handle	0000000	00000

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
0.022"	0000000	00000

Vent Caps

Exhaust Vent

Intake Vent

					Galvanized Steel			Aluminum
Duct Size	Female ID	Male OD	Includes	End Construction	Gauge		Each	Gauge		Each
Exhaust Vent
3	3"	__	Damper	Plain	__	000000	00	24	0000000	000000
4	4"	__	Damper	Plain	30	00000000	000000	24	0000000	00000
5	5"	__	Damper	Plain	30	00000000	00000	__	000000	00
6	6"	__	Damper	Plain	30	00000000	00000	24	0000000	00000
7	7"	__	Damper	Plain	30	00000000	00000	__	000000	00
8	8"	__	Damper	Plain	30	00000000	00000	24	0000000	000000
Intake Vent
4	__	3 7/8"	Screen	Crimped	30	00000000	00000	__	000000	00
5	__	4 7/8"	Screen	Crimped	30	00000000	00000	__	000000	00
6	__	5 7/8"	Screen	Crimped	30	00000000	00000	__	000000	00
7	__	6 7/8"	Screen	Crimped	30	00000000	00000	__	000000	00
8	__	7 7/8"	Screen	Crimped	30	00000000	00000	__	000000	00

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

Straight 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

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.

				Galvanized Steel			Galvanized Steel with Polyethylene Foam Gasket
Duct Size	Female ID	Male OD	End Construction	Gauge		Each	Gauge		Each
Female
3	3"	__	Plain	28	0000000	00000	__	000000	00
4	4"	__	Plain	28	0000000	0000	__	000000	00
5	5"	__	Plain	28	0000000	0000	__	000000	00
6	6"	__	Plain	28	0000000	0000	__	000000	00
8	8"	__	Plain	28	0000000	0000	__	000000	00
10	10"	__	Plain	28	0000000	0000	__	000000	00
12	12"	__	Plain	28	0000000	00000	__	000000	00
14	14"	__	Plain	28	0000000	00000	__	000000	00
16	16"	__	Plain	28	0000000	00000	__	000000	00
18	18"	__	Plain	28	0000000	00000	__	000000	00
20	20"	__	Plain	28	0000000	00000	__	000000	00
Male
3	__	2 7/8"	Crimped	28	0000000	0000	__	000000	00
4	__	3 7/8"	Crimped	28	0000000	0000	__	000000	00
5	__	4 7/8"	Crimped	28	0000000	0000	24	0000000	000000
6	__	5 7/8"	Crimped	28	0000000	0000	24	0000000	00000
7	__	6 7/8"	Crimped	__	000000	00	24	0000000	00000
8	__	7 7/8"	Crimped	28	0000000	0000	24	0000000	00000
10	__	9 7/8"	Crimped	28	0000000	0000	24	0000000	00000
12	__	11 7/8"	Crimped	28	0000000	00000	24	0000000	00000
14	__	13 7/8"	Crimped	28	0000000	00000	24	0000000	00000
16	__	15 7/8"	Crimped	28	0000000	00000	24	0000000	00000
18	__	17 7/8"	Crimped	28	0000000	00000	24	0000000	000000
20	__	19 7/8"	Crimped	28	0000000	00000	__	000000	00

Downdraft Diverters

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

					Galvanized Steel
Duct Size	Female ID	Male OD	Gauge	End Construction		Each
3	3"	2 7/8"	26	Crimped	0000000	000000
4	4"	3 7/8"	26	Crimped	0000000	00000
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	000000
10	10"	9 7/8"	24	Crimped	0000000	000000
12	12"	11 7/8"	24	Crimped	0000000	000000

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
Duct Size	Female ID	Male OD	Gauge	End Construction		Each
3	3"	2 7/8"	20	Plain	0000000	0000000
4	4"	3 7/8"	20	Plain	0000000	000000
5	5"	4 7/8"	20	Plain	0000000	000000
6	6"	5 7/8"	20	Plain	0000000	000000
7	7"	6 7/8"	20	Plain	0000000	000000
8	8"	7 7/8"	18	Plain	0000000	000000
10	10"	9 7/8"	18	Plain	0000000	000000

Rain Caps

Galvanized Steel

			Galvanized Steel
Duct Size	Female ID	End Construction	Gauge		Each
3	3"	Plain	26	0000000	000000
4	4"	Plain	26	0000000	00000
5	5"	Plain	26	0000000	00000
6	6"	Plain	30	0000000	00000
7	7"	Plain	30	0000000	00000
8	8"	Plain	30	0000000	00000
9	9"	Plain	30	0000000	00000
10	10"	Plain	30	0000000	00000
12	12"	Plain	30	0000000	00000

End Caps

Female

Male

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

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About Duct Connections

Standard Duct and Fittings