Thermoplastic Ductwork | McMaster-Carr

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Export Control Classification Number (ECCN)

EAR99

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Gauge

Length

Color

Width

Overall Width

Overall Depth

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

Height

Depth

199 Products

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	2051K67	000000	2051K186	0000000	5124K9	000000


		6	6 5/8"	Gray	2051K61	000000	2051K11	000000	5124K19	00000
		8	8 5/8"	Gray	2051K62	000000	2051K31	000000	5124K39	00000
		10	10 3/4"	Gray	2051K63	000000	2051K51	000000	5124K59	000000
		12	12 3/4"	Gray	2051K64	000000	2051K71	000000	5124K79	000000
		14	14"	Gray	2051K65	000000	2051K91	000000	5124K99	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	2051K27	000000


	6	6 5/8"	Gray	2051K12	000000
	8	8 5/8"	Gray	2051K32	000000
	10	10 3/4"	Gray	2051K52	000000
	12	12 3/4"	Gray	2051K72	000000
	14	14"	Gray	2051K92	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	2051K145	000000


	6	6 5/8"	Gray	2051K14	000000
	8	8 5/8"	Gray	2051K34	000000
	10	10 3/4"	Gray	2051K54	000000
	12	12 3/4"	Gray	2051K74	000000
	14	14"	Gray	2051K94	000000

Straight Connectors

Join two lengths of duct.

			PVC
Duct Size	ID	Color		Each



	4	4 1/2"	Gray	2051K357	000000


	6	6 5/8"	Gray	2051K15	00000
	8	8 5/8"	Gray	2051K35	00000
	10	10 3/4"	Gray	2051K55	00000
	12	12 3/4"	Gray	2051K75	00000
	14	14"	Gray	2051K95	00000

Tee Connectors

Split or merge airflow paths.

			PVC
Duct Size	ID	Color		Each



	4	4 1/2"	Gray	2051K281	000000


	6	6 5/8"	Gray	2051K282	000000
	8	8 5/8"	Gray	2051K283	000000
	10	10 3/4"	Gray	2051K284	000000
	12	12 3/4"	Gray	2051K285	000000
	14	14"	Gray	2051K286	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	2051K21	0000000


	8	6	8 5/8"	6 5/8"	Gray	2051K22	000000
	10	8	10 3/4"	8 5/8"	Gray	2051K23	000000
	12	8	12 3/4"	8 5/8"	Gray	2051K273	000000
	12	10	12 3/4"	10 3/4"	Gray	2051K24	000000
	14	10	14"	10 3/4"	Gray	2051K276	000000
	14	12	14"	12 3/4"	Gray	2051K25	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	2051K742	0000000


	8	10	8 5/8"	Gray	2051K743	000000
	10	12	10 3/4"	Gray	2051K744	000000
	12	14	12 3/4"	Gray	2051K745	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	2051K8	0000000


	6	6 5/8"	Gray	2051K18	000000
	8	8 5/8"	Gray	2051K38	000000
	10	10 3/4"	Gray	2051K58	000000
	12	12 3/4"	Gray	2051K78	000000
	14	14"	Gray	2051K98	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	2051K873	0000000


	6	6 5/8"	Gray	2051K874	000000
	8	8 5/8"	Gray	2051K875	000000
	10	10 3/4"	Gray	2051K876	000000
	12	12 3/4"	Gray	2051K877	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	2051K127	000000


	6	6 5/8"	Gray	2051K121	000000
	8	8 5/8"	Gray	2051K122	000000
	10	10 3/4"	Gray	2051K123	000000
	12	12 3/4"	Gray	2051K124	000000
	14	14"	Gray	2051K125	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	2051K165	0000000


				6	6 5/8"	8 1/4"	Gray	2051K16	000000
				8	8 5/8"	10 1/2"	Gray	2051K36	000000
				10	10 3/4"	13"	Gray	2051K56	000000
				12	12 3/4"	14 1/2"	Gray	2051K76	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	3445K7	0000000


		6	6 5/8"	9 5/8"	17"	6 3/8"	Gray	3445K17	000000
		8	8 5/8"	11 5/8"	20 3/4"	6 3/8"	Gray	3445K37	000000
		10	10 3/4"	13 3/4"	24"	6 3/8"	Gray	3445K57	000000
		12	12 3/4"	15 3/4"	26 3/4"	6 3/8"	Gray	3445K77	000000

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	1889K211	000000


		5	5"	26	1889K212	000000
		6	6"	26	1889K213	000000
		7	7"	26	1889K214	000000
		8	8"	26	1889K215	000000
		9	9"	26	1889K216	000000
		10	10"	26	1889K217	000000
		12	12"	26	1889K219	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	5078K24	000000	24	1889K351	000000	20	2561K15	0000000
5	4 7/8"	24	5078K26	00000	24	1889K352	000000	—	———	0
6	5 7/8"	24	5078K27	00000	24	1889K353	000000	20	2561K16	000000
7	6 7/8"	—	———	0	24	1889K354	000000	—	———	0
8	7 7/8"	24	5078K29	00000	24	1889K355	000000	20	2561K17	000000
9	8 7/8"	—	———	0	24	1889K356	000000	—	———	0
10	9 7/8"	24	5078K31	00000	24	1889K357	000000	20	2561K18	000000
12	11 7/8"	24	5078K32	000000	24	1889K359	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	5078K771	000000	—	———	0	—	———	0
4	3 7/8"	24	5078K772	00000	24	1889K341	000000	20	2561K19	0000000
5	4 7/8"	24	5078K773	00000	24	1889K342	00000	—	———	0
6	5 7/8"	24	5078K774	00000	24	1889K343	00000	20	2561K21	000000
7	6 7/8"	—	———	0	24	1889K344	00000	—	———	0
8	7 7/8"	24	5078K776	00000	24	1889K345	00000	20	2561K22	000000
9	8 7/8"	—	———	0	24	1889K346	000000	—	———	0
10	9 7/8"	24	5078K778	00000	24	1889K347	000000	20	2561K23	000000
12	11 7/8"	24	5078K779	00000	24	1889K348	000000	—	———	0
14	13 7/8"	24	5078K781	00000	—	———	0	—	———	0
16	15 7/8"	24	5078K782	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	5078K45	000000	26	1889K311	000000	24	2561K33	000000


		5	4 7/8"	24	5078K47	00000	26	1889K312	00000	—	———	0
		6	5 7/8"	24	5078K48	00000	26	1889K313	00000	24	2561K34	00000
		7	6 7/8"	—	———	0	26	1889K314	00000	—	———	0
		8	7 7/8"	24	5078K51	00000	26	1889K315	00000	24	2561K35	00000
		9	8 7/8"	—	———	0	26	1889K316	00000	—	———	0
		10	9 7/8"	24	5078K53	00000	26	1889K317	00000	24	2561K36	00000
		12	11 7/8"	24	5078K54	00000	26	1889K319	00000	—	———	0

Tee Connectors

Split or merge airflow paths.

		Chemical-Resistant PVC-Coated Steel
Duct Size	OD	Ga.		Each
4	3 7/8"	24	1889K321	000000
6	5 7/8"	24	1889K324	00000
8	7 7/8"	24	1889K326	000000
10	9 7/8"	24	1889K328	000000
12	11 7/8"	24	1889K302	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	1889K362	0000000
8	7 7/8"	24	1889K364	000000
10	9 7/8"	24	1889K366	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	5078K57	000000	20	1889K372	000000	—	———	0
6	4	5 7/8"	3 7/8"	24	5078K59	00000	20	1889K381	00000	20	2561K28	000000
6	5	5 7/8"	4 7/8"	24	5078K63	00000	20	1889K382	00000	—	———	0
7	6	6 7/8"	5 7/8"	—	———	0	20	1889K374	00000	—	———	0
8	6	7 7/8"	5 7/8"	24	5078K62	00000	20	1889K383	00000	20	2561K29	000000
8	7	7 7/8"	6 7/8"	—	———	0	20	1889K384	00000	—	———	0
9	8	8 7/8"	7 7/8"	—	———	0	20	1889K376	00000	—	———	0
10	8	9 7/8"	7 7/8"	24	5078K65	00000	20	1889K385	000000	20	2561K32	000000
10	9	9 7/8"	8 7/8"	—	———	0	20	1889K386	000000	—	———	0
12	10	11 7/8"	9 7/8"	24	5078K69	00000	20	1889K387	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	1889K323	000000
8	6	8	7 7/8"	5 7/8"	7 7/8"	24	1889K325	000000
10	8	10	9 7/8"	7 7/8"	9 7/8"	24	1889K327	000000
12	8	12	11 7/8"	7 7/8"	11 7/8"	24	1889K329	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	1889K361	000000
8	6	8	7 7/8"	5 7/8"	7 7/8"	24	1889K363	000000
10	8	10	9 7/8"	7 7/8"	9 7/8"	24	1889K365	000000
12	10	12	11 7/8"	9 7/8"	11 7/8"	24	1889K367	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	2775K1	0000000
5	4 7/8"	9 1/4"	23 5/8"	50%	24	2775K2	000000
6	5 7/8"	10 5/8"	23 5/8"	50%	24	2775K3	000000
8	7 7/8"	12 3/4"	23 5/8"	50%	24	2775K4	000000
10	9 7/8"	14 3/8"	35 3/8"	50%	24	2775K5	000000
12	12 3/8"	16 3/4"	35 3/8"	50%	24	2775K6	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	17345K11	0000000

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	1771K25	0000000	1771K55	0000000


		15	15 1/2"	1,500 to 2,500	180	White	1771K26	000000	1771K56	000000
		18	18 1/2"	2,500 to 3,500	180	White	1771K27	000000	1771K57	000000
		24	24 1/2"	3,500 to 5,000	180	White	1771K28	000000	1771K58	000000
		30	30 1/2"	6,500 to 8,000	180	White	1771K31	000000	1771K61	000000

Clamps

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

		Each
Stainless Steel



	12, 15, 18	1771K13	000000


	24, 30	1771K14	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	2051K165	0000000
6	6 5/8"	8 1/4"	Gray	2051K16	000000
8	8 5/8"	10 1/2"	Gray	2051K36	000000
10	10 3/4"	13"	Gray	2051K56	000000
12	12 3/4"	14 1/2"	Gray	2051K76	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"	3445K7	0000000
6	6 5/8"	9 5/8"	17"	6 3/8"	3445K17	000000
8	8 5/8"	11 5/8"	20 3/4"	6 3/8"	3445K37	000000
10	10 3/4"	13 3/4"	24"	6 3/8"	3445K57	000000
12	12 3/4"	15 3/4"	26 3/4"	6 3/8"	3445K77	000000