Thermoplastic Ductwork | McMaster-Carr

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Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Gauge

Color

Recommended Airflow

1,000 ft³/min to 1,500 ft³/min

1,500 ft³/min to 2,500 ft³/min

2,500 ft³/min to 3,500 ft³/min

3,500 ft³/min to 5,000 ft³/min

6,500 ft³/min to 8,000 ft³/min

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180 Products

About Duct Connections

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.

Duct

Add a noise reducer to duct to decrease noise by as much as 50%.

			PVC-Coated Steel
Duct Size	Female ID	End Construction	Gauge		5 ft.
4	4"	Plain	26	00000000	000000
5	5"	Plain	26	00000000	000000
6	6"	Plain	26	00000000	000000
7	7"	Plain	26	00000000	000000
8	8"	Plain	26	00000000	000000
9	9"	Plain	26	00000000	000000
10	10"	Plain	26	00000000	000000
12	12"	Plain	26	00000000	000000

90° Elbow Connectors

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

Tee Connectors

Tee connectors join or split runs of duct.

				PVC-Coated Steel
Duct Size	Male OD	Gauge	End Construction		Each
4	3 7/8"	24	Plain	00000000	000000
6	5 7/8"	24	Plain	00000000	00000
8	7 7/8"	24	Plain	00000000	000000
10	9 7/8"	24	Plain	00000000	000000
12	11 7/8"	24	Plain	00000000	000000

45° Wye Connectors

Wye connectors join or split runs of duct.

				PVC-Coated Steel
Duct Size	Male OD	Gauge	End Construction		Each
6	5 7/8"	24	Plain	00000000	0000000
8	7 7/8"	24	Plain	00000000	000000
10	9 7/8"	24	Plain	00000000	000000

Straight Connectors

Male

Male straight connectors are required to connect two pieces of duct.

			Galvanized Steel			PVC-Coated Steel			304 Stainless Steel
Duct Size	Male OD	End Construction	Gauge		Each	Gauge		Each	Gauge		Each
Male
4	3 7/8"	Plain	24	0000000	000000	26	00000000	000000	24	0000000	000000
5	4 7/8"	Plain	24	0000000	00000	26	00000000	00000	__	000000	00
6	5 7/8"	Plain	24	0000000	00000	26	00000000	00000	24	0000000	00000
7	6 7/8"	Plain	__	000000	00	26	00000000	00000	__	000000	00
8	7 7/8"	Plain	24	0000000	00000	26	00000000	00000	24	0000000	00000
9	8 7/8"	Plain	__	000000	00	26	00000000	00000	__	000000	00
10	9 7/8"	Plain	24	0000000	00000	26	00000000	00000	24	0000000	00000
12	11 7/8"	Plain	24	0000000	00000	26	00000000	00000	__	000000	00

Tee Reducers

Reducers connect duct with different diameters.

Duct Size			Male OD					PVC-Coated Steel
(A)	(B)	(C)	(A)	(B)	(C)	Gauge	End Construction		Each
6	4	6	5 7/8"	3 7/8"	5 7/8"	24	Plain	00000000	000000
8	6	8	7 7/8"	5 7/8"	7 7/8"	24	Plain	00000000	000000
10	8	10	9 7/8"	7 7/8"	9 7/8"	24	Plain	00000000	000000
12	8	12	11 7/8"	7 7/8"	11 7/8"	24	Plain	00000000	000000

45° Wye Reducers

Reducers connect duct with different diameters.

Duct Size			Male OD					PVC-Coated Steel
(A)	(B)	(C)	(A)	(B)	(C)	Gauge	End Construction		Each
6	4	6	5 7/8"	3 7/8"	5 7/8"	24	Plain	00000000	000000
8	6	8	7 7/8"	5 7/8"	7 7/8"	24	Plain	00000000	000000
10	8	10	9 7/8"	7 7/8"	9 7/8"	24	Plain	00000000	000000
12	10	12	11 7/8"	9 7/8"	11 7/8"	24	Plain	00000000	000000

Straight Reducers

Reducers connect duct with different diameters.

Duct Size		Male OD
(A)	(B)	(A)	(B)	End Construction	Gauge		Each
Galvanized Steel
5	4	4 7/8"	3 7/8"	Plain	24	0000000	000000
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	8	9 7/8"	7 7/8"	Plain	24	0000000	00000
12	10	11 7/8"	9 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	000000
10	9	9 7/8"	8 7/8"	Plain	20	00000000	000000
12	10	11 7/8"	9 7/8"	Plain	20	00000000	000000
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	000000
10	8	9 7/8"	7 7/8"	Plain	20	0000000	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.

Duct

			PVC Plastic
Duct Size	Male OD	Color		5 ft.	10 ft.
4	4 1/2"	Gray	00000000	000000	0000000
6	6 5/8"	Gray	00000000	000000	000000
8	8 5/8"	Gray	00000000	000000	000000
10	10 3/4"	Gray	00000000	000000	000000
12	12 3/4"	Gray	00000000	000000	000000
14	14"	Gray	00000000	000000	000000

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	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

Tee Connectors

Tee connectors join or split runs of duct.

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

Straight Connectors

Straight connectors are required to connect two pieces of duct.

			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	00000
10	10 3/4"	Gray	0000000	00000
12	12 3/4"	Gray	0000000	00000
14	14"	Gray	0000000	00000

Reducers

Reducers connect duct with different diameters.

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

Airflow Dampers

Airflow dampers regulate airflow.

			PVC Plastic
Duct Size	Female ID	Color		Each
4	4 1/2"	Gray	00000000	0000000
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

Blast Gates

Blast gates stop airflow when closed.

			PVC Plastic
Duct Size	Female ID	Color		Each
4	4 1/2"	Gray	000000	0000000
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

Intake Hoods

Intake hoods exhaust fumes from your work area.

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

45° Wye Saddles

Saddles add a branch to an existing run of duct. Cut a hole in the duct and fit the saddle over the hole.

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

Rain Caps

			PVC Plastic
Duct Size	Female ID	Color		Each
4	4 1/2"	Gray	000000	0000000
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

End Caps

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

Straight-Run Fabric Duct

Evenly distribute air from fans and blowers throughout large spaces.

Duct is durable, flame-retardant polyethylene plastic with evenly spaced air holes. Use the sewn-in snap hooks to hang it from beams or cable.

Clamp connects duct to fans and blowers.

Duct

Duct

						25 ft. Lg.		50 ft. Lg.
Duct Size	Female ID	Recommended Airflow, cfm	Color	Max. Temp., °F	Connection Type		Each		Each
12	12 1/2"	1,000-1,500	White	180°	Worm-Drive Clamp	0000000	0000000	0000000	0000000
15	15 1/2"	1,500-2,500	White	180°	Worm-Drive Clamp	0000000	000000	0000000	000000
18	18 1/2"	2,500-3,500	White	180°	Worm-Drive Clamp	0000000	000000	0000000	000000
24	24 1/2"	3,500-5,000	White	180°	Worm-Drive Clamp	0000000	000000	0000000	000000
30	30 1/2"	6,500-8,000	White	180°	Worm-Drive Clamp	0000000	000000	0000000	000000

Clamp

Duct Size	Gender	Connection Type		Each
12, 15, 18	Female	Worm-Drive Clamp	0000000	000000
24, 30	Female	Worm-Drive Clamp	0000000	00000

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About Duct Connections

Crush-Resistant Spiral Duct and Fittings

Chemical-Resistant Duct and Fittings

Straight-Run Fabric Duct