Thermoplastic Ductwork | McMaster-Carr

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Export Control Classification Number (ECCN)

EAR99

Gauge

Length

Color

Width

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

Overall Width

Overall Depth

Overall Height

Overall Length

Height

199 Products

Spiral Duct and Fittings

Reinforced with a continuous seam, this duct keeps its shape, even against suction from dust collection systems. On the inside, duct is smooth for efficient airflow. Because of its attractive look, spiral duct is often used for exposed heating and cooling systems.

Duct

Pair with compatible fittings and accessories.

Chemical-Resistant PVC-Coated Steel—This duct combines the strength of steel with the chemical resistance of plastic. More economical than 304 stainless steel and stronger than PVC, it’s often used to exhaust corrosive gases, vapors, and fumes.

			5 ft. Long
	Duct Size	ID	Ga.		Each
Chemical-Resistant PVC-Coated Steel



		4	4"	26	00000000	000000


		5	5"	26	00000000	000000
		6	6"	26	00000000	000000
		7	7"	26	00000000	000000
		8	8"	26	00000000	000000
		9	9"	26	00000000	000000
		10	10"	26	00000000	000000
		12	12"	26	00000000	000000

90° Elbow Connectors

Change the direction of airflow when joining lengths of duct.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

Corrosion-Resistant 304 Stainless Steel—The most corrosion-resistant metal duct we sell. It won’t rust or degrade in systems that exhaust chemical fumes or vent heat from industrial ovens and dryers.

		Galvanized Steel			Chemical-Resistant PVC-Coated Steel			Corrosion-Resistant 304 Stainless Steel
Duct Size	OD	Ga.		Each	Ga.		Each	Ga.		Each
4	3 7/8"	24	0000000	000000	24	00000000	000000	20	0000000	0000000
5	4 7/8"	24	0000000	00000	24	00000000	000000	—	———	0
6	5 7/8"	24	0000000	00000	24	00000000	000000	20	0000000	000000
7	6 7/8"	—	———	0	24	00000000	000000	—	———	0
8	7 7/8"	24	0000000	00000	24	00000000	000000	20	0000000	000000
9	8 7/8"	—	———	0	24	00000000	000000	—	———	0
10	9 7/8"	24	0000000	00000	24	00000000	000000	20	0000000	000000
12	11 7/8"	24	0000000	000000	24	00000000	000000	—	———	0

45° Elbow Connectors

Change the direction of airflow when joining lengths of duct.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

		Galvanized Steel			Chemical-Resistant PVC-Coated Steel			Corrosion-Resistant 304 Stainless Steel
Duct Size	OD	Ga.		Each	Ga.		Each	Ga.		Each
3	2 7/8"	24	00000000	000000	—	———	0	—	———	0
4	3 7/8"	24	00000000	00000	24	00000000	000000	20	0000000	0000000
5	4 7/8"	24	00000000	00000	24	00000000	00000	—	———	0
6	5 7/8"	24	00000000	00000	24	00000000	00000	20	0000000	000000
7	6 7/8"	—	———	0	24	00000000	00000	—	———	0
8	7 7/8"	24	00000000	00000	24	00000000	00000	20	0000000	000000
9	8 7/8"	—	———	0	24	00000000	000000	—	———	0
10	9 7/8"	24	00000000	00000	24	00000000	000000	20	0000000	000000
12	11 7/8"	24	00000000	00000	24	00000000	000000	—	———	0
14	13 7/8"	24	00000000	00000	—	———	0	—	———	0
16	15 7/8"	24	00000000	000000	—	———	0	—	———	0

Straight Connectors

Join two lengths of duct.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

			Galvanized Steel			Chemical-Resistant PVC-Coated Steel			Corrosion-Resistant 304 Stainless Steel
	Duct Size	OD	Ga.		Each	Ga.		Each	Ga.		Each
Male



		4	3 7/8"	24	0000000	000000	26	00000000	000000	24	0000000	000000


		5	4 7/8"	24	0000000	00000	26	00000000	00000	—	———	0
		6	5 7/8"	24	0000000	00000	26	00000000	00000	24	0000000	00000
		7	6 7/8"	—	———	0	26	00000000	00000	—	———	0
		8	7 7/8"	24	0000000	00000	26	00000000	00000	24	0000000	00000
		9	8 7/8"	—	———	0	26	00000000	00000	—	———	0
		10	9 7/8"	24	0000000	00000	26	00000000	00000	24	0000000	00000
		12	11 7/8"	24	0000000	00000	26	00000000	00000	—	———	0

Tee Connectors

Split or merge airflow paths.

		Chemical-Resistant PVC-Coated Steel
Duct Size	OD	Ga.		Each
4	3 7/8"	24	00000000	000000
6	5 7/8"	24	00000000	00000
8	7 7/8"	24	00000000	000000
10	9 7/8"	24	00000000	000000
12	11 7/8"	24	00000000	000000

45° Wye Connectors

Split or merge airflow more gradually than tees. With less abrupt changes in direction, wyes reduce turbulence for smoother flow.

		Chemical-Resistant PVC-Coated Steel
Duct Size	OD	Ga.		Each
6	5 7/8"	24	00000000	0000000
8	7 7/8"	24	00000000	000000
10	9 7/8"	24	00000000	000000

Straight Reducers

Transition between duct of different diameters. Reducers also join larger duct with smaller duct that connects to equipment.

Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.

Duct Size		OD		Galvanized Steel			Chemical-Resistant PVC-Coated Steel			Corrosion-Resistant 304 Stainless Steel
(A)	(B)	(A)	(B)	Ga.		Each	Ga.		Each	Ga.		Each
5	4	4 7/8"	3 7/8"	24	0000000	000000	20	00000000	000000	—	———	0
6	4	5 7/8"	3 7/8"	24	0000000	00000	20	00000000	00000	20	0000000	000000
6	5	5 7/8"	4 7/8"	24	0000000	00000	20	00000000	00000	—	———	0
7	6	6 7/8"	5 7/8"	—	———	0	20	00000000	00000	—	———	0
8	6	7 7/8"	5 7/8"	24	0000000	00000	20	00000000	00000	20	0000000	000000
8	7	7 7/8"	6 7/8"	—	———	0	20	00000000	00000	—	———	0
9	8	8 7/8"	7 7/8"	—	———	0	20	00000000	00000	—	———	0
10	8	9 7/8"	7 7/8"	24	0000000	00000	20	00000000	000000	20	0000000	000000
10	9	9 7/8"	8 7/8"	—	———	0	20	00000000	000000	—	———	0
12	10	11 7/8"	9 7/8"	24	0000000	00000	20	00000000	000000	—	———	0

Tee Reducers

Connect duct of different diameters to split or merge airflow.

Duct Size			OD			Chemical-Resistant PVC-Coated Steel
(A)	(B)	(C)	(A)	(B)	(C)	Ga.		Each
6	4	6	5 7/8"	3 7/8"	5 7/8"	24	00000000	000000
8	6	8	7 7/8"	5 7/8"	7 7/8"	24	00000000	000000
10	8	10	9 7/8"	7 7/8"	9 7/8"	24	00000000	000000
12	8	12	11 7/8"	7 7/8"	11 7/8"	24	00000000	000000

45° Wye Reducers

Connect duct of different diameters to split or merge airflow more gradually than tees. With less abrupt changes in direction, wyes reduce turbulence for smoother flow.

Duct Size			OD			Chemical-Resistant PVC-Coated Steel
(A)	(B)	(C)	(A)	(B)	(C)	Ga.		Each
6	4	6	5 7/8"	3 7/8"	5 7/8"	24	00000000	000000
8	6	8	7 7/8"	5 7/8"	7 7/8"	24	00000000	000000
10	8	10	9 7/8"	7 7/8"	9 7/8"	24	00000000	000000
12	10	12	11 7/8"	9 7/8"	11 7/8"	24	00000000	000000

Duct Noise Reducers

Muffle noise from high-velocity airflow and fans, blowers, and dust collectors. These reducers are insulated to decrease noise levels in your facility by half.

Galvanized Steel—Strong and corrosion resistant, galvanized steel is the most commonly used ductwork material.

		Overall			Galvanized Steel with Rubber Gasket
Duct Size	OD	Dia.	Lg.	Sound Absorbed	Ga.		Each
4	3 7/8"	8 1/4"	23 5/8"	50%	24	000000	0000000
5	4 7/8"	9 1/4"	23 5/8"	50%	24	000000	000000
6	5 7/8"	10 5/8"	23 5/8"	50%	24	000000	000000
8	7 7/8"	12 3/4"	23 5/8"	50%	24	000000	000000
10	9 7/8"	14 3/8"	35 3/8"	50%	24	000000	000000
12	12 3/8"	16 3/4"	35 3/8"	50%	24	000000	000000

Duct Floor Sweeps

Get dust and debris off your floor and into your collection system. Open the hinged door of these sweeps and push material inside so it can be sucked away.

Galvanized Steel—Strong and corrosion resistant, galvanized steel is the most commonly used ductwork material.

		Overall			Galvanized Steel
Duct Size	ID	Wd.	Ht.	Dp.	Ga.		Each
6	6"	11 1/8"	18 1/4"	6"	18	00000000	0000000

Chemical-Resistant Duct and Fittings

Chemicals can eat away at most metal duct, but not this PVC system. It’s often used to exhaust corrosive gases, vapors, and fumes. Components press-fit together and secure with PVC pipe cement.

Duct

Pair with compatible fittings and accessories.

To start a run of duct, mount a flange to equipment. Flanges also create a secure joint between sections of duct—attach a flange to each piece. Also known as angle rings.

	Duct							Duct Flanges
				5 ft. Long		10 ft. Long
	Duct Size	OD	Color		Each		Each		Each
PVC



		4	4 1/2"	Gray	0000000	000000	00000000	0000000	000000	000000


		6	6 5/8"	Gray	0000000	000000	0000000	000000	0000000	00000
		8	8 5/8"	Gray	0000000	000000	0000000	000000	0000000	00000
		10	10 3/4"	Gray	0000000	000000	0000000	000000	0000000	000000
		12	12 3/4"	Gray	0000000	000000	0000000	000000	0000000	000000
		14	14"	Gray	0000000	000000	0000000	000000	0000000	000000

90° Elbow Connectors

Change the direction of airflow when joining lengths of duct.

			PVC
Duct Size	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

Change the direction of airflow when joining lengths of duct.

			PVC
Duct Size	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

Straight Connectors

Join two lengths of duct.

			PVC
Duct Size	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

Tee Connectors

Split or merge airflow paths.

			PVC
Duct Size	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 Reducers

Transition between duct of different diameters. Reducers also join larger duct with smaller duct that connects to equipment.

Duct Size		ID			PVC
(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	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

45° Wye Saddles

A more gradual change of direction than tees, wye saddles add onto existing ductwork without disassembling it. Cut a hole in your duct and then install the saddle over the opening.

Duct Size				PVC
(A)	(B)	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

Prevent blockages that can disrupt airflow in vertical duct and exhaust stacks. These caps keep water and debris from entering your system.

			PVC
Duct Size	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

Intake Hoods

Capture air, vapors, and fumes and funnel them away. These hoods direct contaminants into your duct system and away from workers and machines.

			PVC
Duct Size	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

End Caps

Cover unused duct openings to prevent air from leaking, dust from escaping, and debris from entering. End caps are often used to seal duct after changes to your system or equipment. To make modifications or expand your line, remove the cap.

			PVC
Duct Size	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

Duct Airflow Dampers

Turn the lever to adjust airflow.

					PVC
	Duct Size	ID	Overall Lg.	Color		Each
Standard Airflow Damper







				Female

				4	4 1/2"	7 1/2"	Gray	00000000	0000000


				6	6 5/8"	8 1/4"	Gray	0000000	000000
				8	8 5/8"	10 1/2"	Gray	0000000	000000
				10	10 3/4"	13"	Gray	0000000	000000
				12	12 3/4"	14 1/2"	Gray	0000000	000000

Duct Blast Gates

Open and close the slide to control airflow to sections of duct. Blast gates turn flow on or off.

			Overall
	Duct Size	ID	Wd.	Ht.	Dp.	Color		Each
PVC



		4	4 1/2"	7 1/2"	14"	5"	Gray	000000	0000000


		6	6 5/8"	9 5/8"	17"	6 3/8"	Gray	0000000	000000
		8	8 5/8"	11 5/8"	20 3/4"	6 3/8"	Gray	0000000	000000
		10	10 3/4"	13 3/4"	24"	6 3/8"	Gray	0000000	000000
		12	12 3/4"	15 3/4"	26 3/4"	6 3/8"	Gray	0000000	000000

Fabric Duct and Fittings

Evenly distribute air from fans and blowers through large spaces. This economical system has only two components—duct and clamps.

Duct

Hang duct from beams or cables using the sewn-in snap hooks.

Polyethylene Fabric—This woven material is coated to resist tears and punctures. It’s also fire retardant.

						25 ft. Long		50 ft. Long
	Duct Size	ID	Recommended Airflow, ft³/min	Max. Temp., ° F	Color		Each		Each
Polyethylene Fabric



		12	12 1/2"	1,000 to 1,500	180	White	0000000	0000000	0000000	0000000


		15	15 1/2"	1,500 to 2,500	180	White	0000000	000000	0000000	000000
		18	18 1/2"	2,500 to 3,500	180	White	0000000	000000	0000000	000000
		24	24 1/2"	3,500 to 5,000	180	White	0000000	000000	0000000	000000
		30	30 1/2"	6,500 to 8,000	180	White	0000000	000000	0000000	000000

Clamps

Tighten the screw on these clamps to secure duct to fans and blowers.

		Each
Stainless Steel



	12, 15, 18	0000000	000000


	24, 30	0000000	00000

Airflow Dampers for Chemical-Resistant Duct

Turn the lever on these dampers to regulate airflow in PVC duct. They withstand chemicals that would break down most metal components. Secure to duct with PVC pipe cement (not included).

				PVC
Duct Size	ID	Overall Lg.	Color		Each
4	4 1/2"	7 1/2"	Gray	00000000	0000000
6	6 5/8"	8 1/4"	Gray	0000000	000000
8	8 5/8"	10 1/2"	Gray	0000000	000000
10	10 3/4"	13"	Gray	0000000	000000
12	12 3/4"	14 1/2"	Gray	0000000	000000

Blast Gates for Chemical-Resistant Duct

Start and stop airflow to sections of PVC duct. These gates withstand chemicals that would break down most metal components. Secure gates to duct with PVC pipe cement (not included).

		Overall			PVC
Duct Size	ID	Wd.	Ht.	Dp.		Each
4	4 1/2"	7 1/2"	14"	5"	000000	0000000
6	6 5/8"	9 5/8"	17"	6 3/8"	0000000	000000
8	8 5/8"	11 5/8"	20 3/4"	6 3/8"	0000000	000000
10	10 3/4"	13 3/4"	24"	6 3/8"	0000000	000000
12	12 3/4"	15 3/4"	26 3/4"	6 3/8"	0000000	000000