McMaster-Carr

Search Results

	Trade Size Trade Size

	Shape Shape


Straight	Tee

	Material Material

	Finish Finish

Galvanized

PVC Coated

	ID ID

	OD OD

	Connection Type Connection Type

	Press Fit
	Quick- Disconnect Clamp
	Interlocking Bracket

	End Construction End Construction

Crimped

Plain

Rolled

	Gender Gender

Male

Female

	Gauge Gauge

View catalog pages (8)

Forward

How can we improve?

96 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.

Straight Reducers, Female × Male

Reducers connect duct with different diameters.

Trade Size
(A)	(B)	Female ID (A)	Male OD (B)	End Construction	Gauge		Each
Galvanized Steel
4	3	4"	2 7/8"	Crimped	26	0000000	00000
5	4	5"	3 7/8"	Crimped	26	0000000	0000
6	4	6"	3 7/8"	Crimped	26	0000000	00000
6	5	6"	4 7/8"	Crimped	26	0000000	00000
7	6	7"	5 7/8"	Crimped	26	0000000	00000
8	6	8"	5 7/8"	Crimped	26	0000000	00000
8	7	8"	6 7/8"	Crimped	26	0000000	00000
9	6	9"	5 7/8"	Crimped	26	0000000	00000
9	8	9"	7 7/8"	Crimped	26	0000000	00000
10	6	10"	5 7/8"	Crimped	26	0000000	00000
10	7	10"	6 7/8"	Crimped	26	0000000	00000
10	8	10"	7 7/8"	Crimped	26	0000000	00000
10	9	10"	8 7/8"	Crimped	26	0000000	00000
12	6	12"	5 7/8"	Crimped	26	0000000	00000
12	7	12"	6 7/8"	Crimped	26	0000000	00000
12	8	12"	7 7/8"	Crimped	26	0000000	00000
12	10	12"	9 7/8"	Crimped	26	0000000	00000
Aluminum
4	3	4"	2 7/8"	Crimped	26	0000000	00000
5	4	5"	3 7/8"	Crimped	24	0000000	00000
6	4	6"	3 7/8"	Crimped	24	0000000	00000
7	4	7"	3 7/8"	Crimped	24	0000000	00000
7	5	7"	4 7/8"	Crimped	24	0000000	00000
8	6	8"	5 7/8"	Crimped	24	0000000	00000
10	6	10"	5 7/8"	Crimped	24	0000000	00000
10	8	10"	7 7/8"	Crimped	24	0000000	00000
12	8	12"	7 7/8"	Crimped	24	0000000	00000
12	10	12"	9 7/8"	Crimped	24	0000000	00000
304 Stainless Steel
4	3	4"	2 7/8"	Crimped	26	0000000	00000
6	4	6"	3 7/8"	Crimped	26	0000000	00000
8	4	8"	3 7/8"	Crimped	26	0000000	00000
8	6	8"	5 7/8"	Crimped	26	0000000	00000
10	6	10"	5 7/8"	Crimped	26	0000000	00000
10	8	10"	7 7/8"	Crimped	26	0000000	00000
12	10	12"	9 7/8"	Crimped	26	0000000	000000

Tee Reducers

Female × Female × Male

Reducers connect duct with different diameters.

Trade Size			Female ID		Male OD			304 Stainless Steel
(A)	(B)	(C)	(A)	(B)	(C)	Gauge	End Construction		Each
Female × Female × Male
4	3	4	4"	3"	3 7/8"	26	Crimped	00000000	0000000
5	3	5	5"	3"	4 7/8"	26	Crimped	00000000	000000

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.

Straight Reducers

Reducers connect duct with different diameters.

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

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.

Reducers

Reducers connect duct with different diameters.

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

Reducers

Reducers connect duct with different diameters.

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

Sure-Seal Spiral Duct and Fittings

Gaskets 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.

Reducers

Reducers connect duct with different diameters.

Trade Size		Male OD				Galvanized Steel
(A)	(B)	(A)	(B)	Gauge	Gasket Material		Each
6	4	5 7/8"	3 7/8"	20	EPDM Rubber	0000000	000000
8	6	7 7/8"	5 7/8"	20	EPDM Rubber	0000000	00000
10	6	9 7/8"	5 7/8"	20	EPDM Rubber	0000000	00000
10	8	9 7/8"	7 7/8"	20	EPDM Rubber	0000000	00000
12	8	11 7/8"	7 7/8"	20	EPDM Rubber	0000000	00000
12	10	11 7/8"	9 7/8"	20	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.

Straight Reducers

Reducer decreases duct width by 2”.

			Galvanized Steel
Wd.	Ht.	Gauge		Each
2"	8"	28	0000000	000000

Terms and Conditions and Privacy Policy

About Duct Connections