PVC Duct Connectors | McMaster-Carr

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With Mounting Holes

97 Products

Duct Flanges


With Mounting Holes	With Mounting Holes

Mount flanges to air handlers and HVAC equipment to start a run of duct. They also create a secure joint between sections of duct—attach a flange to each piece. Also known as angle rings.

With Mounting Holes—Ready to install, these flanges secure with screws.

PVC—Withstand chemicals that would eat away at most metal duct. It’s often used in systems that exhaust corrosive gases, vapors, and fumes.

				Flange		Mounting
	Duct Size	ID	Overall Dp.	Ht.	Thk.	Fasteners Included	No. of Holes	Hole Dia.		Each
With Mounting Holes







				PVC

				4	4 1/2"	2 1/4"	1 7/8"	1/4"	No	4	5/16"	5124K9	000000


				6	6 5/8"	3 1/4"	1 1/2"	1/4"	No	8	5/16"	5124K19	00000
				8	8 5/8"	3 1/4"	1 1/2"	1/4"	No	10	5/16"	5124K39	00000
				10	10 3/4"	3 1/4"	1 3/8"	1/4"	No	12	5/16"	5124K59	000000
				12	12 3/4"	3 1/2"	1 3/8"	1/4"	No	16	5/16"	5124K79	000000
				14	14"	3 1/2"	1 3/4"	1/4"	No	16	5/16"	5124K99	000000
				16	16"	3 1/2"	1 3/4"	1/4"	No	18	5/16"	5124K49	000000

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.

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

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.

90° Elbow Connectors

Change the direction of airflow when joining lengths of duct.

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.

		Chemical-Resistant PVC-Coated Steel
Duct Size	OD	Ga.		Each
4	3 7/8"	24	1889K351	000000
5	4 7/8"	24	1889K352	000000
6	5 7/8"	24	1889K353	000000
7	6 7/8"	24	1889K354	000000
8	7 7/8"	24	1889K355	000000
9	8 7/8"	24	1889K356	000000
10	9 7/8"	24	1889K357	000000
12	11 7/8"	24	1889K359	000000

45° Elbow Connectors

Change the direction of airflow when joining lengths of duct.

		Chemical-Resistant PVC-Coated Steel
Duct Size	OD	Ga.		Each
4	3 7/8"	24	1889K341	000000
5	4 7/8"	24	1889K342	00000
6	5 7/8"	24	1889K343	00000
7	6 7/8"	24	1889K344	00000
8	7 7/8"	24	1889K345	00000
9	8 7/8"	24	1889K346	000000
10	9 7/8"	24	1889K347	000000
12	11 7/8"	24	1889K348	000000

Straight Connectors

Join two lengths of duct.

			Chemical-Resistant PVC-Coated Steel
	Duct Size	OD	Ga.		Each
Male



		4	3 7/8"	26	1889K311	000000


		5	4 7/8"	26	1889K312	00000
		6	5 7/8"	26	1889K313	00000
		7	6 7/8"	26	1889K314	00000
		8	7 7/8"	26	1889K315	00000
		9	8 7/8"	26	1889K316	00000
		10	9 7/8"	26	1889K317	00000
		12	11 7/8"	26	1889K319	00000

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.

Duct Size		OD		Chemical-Resistant PVC-Coated Steel
(A)	(B)	(A)	(B)	Ga.		Each
5	4	4 7/8"	3 7/8"	20	1889K372	000000
6	4	5 7/8"	3 7/8"	20	1889K381	00000
6	5	5 7/8"	4 7/8"	20	1889K382	00000
7	6	6 7/8"	5 7/8"	20	1889K374	00000
8	6	7 7/8"	5 7/8"	20	1889K383	00000
8	7	7 7/8"	6 7/8"	20	1889K384	00000
9	8	8 7/8"	7 7/8"	20	1889K376	00000
10	8	9 7/8"	7 7/8"	20	1889K385	000000
10	9	9 7/8"	8 7/8"	20	1889K386	000000
12	10	11 7/8"	9 7/8"	20	1889K387	000000

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

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