Steel Rain Caps | McMaster-Carr

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29 Products

Standard Duct and Fittings

Deliver air for a range of HVAC applications, including exhaust and dust collection. Our basic duct, the round shape creates smoother, more efficient airflow than rectangular and oval duct. The male end is slightly smaller than the female, so sections join without clamps or tools.

Vent Caps


Exhaust Vent	Intake Vent

Cover vents with caps that let air in or out.

Exhaust Vent—A built-in damper allows air to escape while blocking backdrafts, rain, and snow.

Intake Vent—Only fresh air enters though the screen—no debris or pests allowed.

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

							Galvanized Steel
	Duct Size	ID	OD	Ga.	Features	Includes		Each
Exhaust Vent



		4	4"	—	30	—	Backdraft Damper	1766K484	000000


		5	5"	—	30	—	Backdraft Damper	1766K485	00000
		6	6"	—	30	—	Backdraft Damper	1766K492	00000
		7	7"	—	30	—	Backdraft Damper	1766K486	00000
		8	8"	—	30	—	Backdraft Damper	1766K493	00000


		Intake Vent



				4	—	3 7/8"	30	Bird Screen	—	1766K481	00000


				5	—	4 7/8"	30	Bird Screen	—	1766K482	00000
				6	—	5 7/8"	30	Bird Screen	—	1766K497	00000
				7	—	6 7/8"	30	Bird Screen	—	1766K483	00000
				8	—	7 7/8"	30	Bird Screen	—	1766K498	00000

Rain Caps

Top off vertical duct and exhaust stacks to prevent corrosion and blockages that can disrupt airflow.

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		Corrosion-Resistant 304 Stainless Steel
Duct Size	ID	Ga.		Each		Each



	3	3"	26	1766K71	000000	———	0


	4	4"	26	1766K72	00000	1767K32	000000
	5	5"	26	1766K73	00000	———	0
	6	6"	26	1766K74	00000	1767K34	00000
	7	7"	26	1766K75	00000	———	0
	8	8"	26	1766K76	00000	1767K36	00000
	9	9"	26	1766K77	00000	———	0
	10	10"	26	1766K78	00000	1767K37	000000
	12	12"	26	1766K79	00000	1767K38	000000

High-Temperature Chimney Vent Pipe and Fittings

Built to withstand temperatures up to 1000° F, these vent pipes and fittings are for use with boilers, furnaces, stoves, and other equipment that is fired by gas, oil, wood, or coal.

To join pipes and connectors, twist a male end into a female end and secure with the included locking band.

Rain Caps

			304 Stainless Steel
Chimney Pipe Size	Ga.	Certification		Each



	6	28	UL Listed	1716K46	0000000


	8	28	UL Listed	1716K47	000000
	10	28	UL Listed	1716K48	000000

Duct Vent Caps


Wall Mount	Sloped Roof Mount

Cover wall and roof vents to prevent cold air and debris from entering your system. These caps have damper to reduce backdrafts and a screen that blocks birds from sneaking in.

Painted Steel—Strong for a long life, these caps have a black finish to prevent rust.

	For Duct						Mounting			Painted Steel
	Ht.	Wd.	Dia.	Ht.	Wd.	Lg.	Fasteners Included	Hole Dia.	Color		Each
Wall Mount







				For Rectangular Duct

				10"	3 1/4"	—	5 5/8"	12 3/4"	8 7/8"	No	3/16"	Black	6904K36	000000


				Sloped Roof Mount







								For Rectangular and Round Duct

								10"	3 1/4"	8"	6 5/8"	14 1/4"	18 3/4"	—	—	Black	6904K34	00000