Rain Caps | McMaster-Carr

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55 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.

Lightweight Aluminum—One-third the weight of steel, aluminum ductwork is easier to handle during installation. Like galvanized steel, it resists rust in wet environments but won’t last as long.

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



		3	3"	—	30	—	Backdraft Damper	———	0	1773K61	000000


		4	4"	—	30	—	Backdraft Damper	1766K484	000000	1773K62	00000
		5	5"	—	30	—	Backdraft Damper	1766K485	00000	———	0
		6	6"	—	30	—	Backdraft Damper	1766K492	00000	———	0
		6	6"	—	22	—	Backdraft Damper	———	0	1773K63	00000
		7	7"	—	30	—	Backdraft Damper	1766K486	00000	———	0
		8	8"	—	30	—	Backdraft Damper	1766K493	00000	———	0
		8	8"	—	22	—	Backdraft Damper	———	0	1773K64	000000


		Intake Vent



				4	—	3 7/8"	30	Bird Screen	—	1766K481	00000	———	0


				5	—	4 7/8"	30	Bird Screen	—	1766K482	00000	———	0
				6	—	5 7/8"	30	Bird Screen	—	1766K497	00000	———	0
				7	—	6 7/8"	30	Bird Screen	—	1766K483	00000	———	0
				8	—	7 7/8"	30	Bird Screen	—	1766K498	00000	———	0

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

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.

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

Gas Chimney Vent Pipe and Fittings

For use with gas-fired equipment, such as boilers and furnaces, these vent pipes and fittings withstand temperatures up to 400° F. Also known as type B gas vents.

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

Rain Caps

				Aluminum
Chimney Pipe Size	OD	Ga.	Certification		Each



	4	4"	28	UL Listed	2117K42	000000


	5	5"	28	UL Listed	2117K43	00000
	6	6"	28	UL Listed	2117K44	00000
	7	7"	28	UL Listed	2117K45	00000
	8	8"	28	UL Listed	2117K46	00000

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

Stretchable Elastic Dust Covers

Similar to a shower cap, these covers have an elastic band that allows them to stretch and cover a variety of shapes in a range of sizes. They are often used in masking applications to protect against contaminants.

	Color	Max. Temp., ° F	Performance	Pkg. Qty.		Pkg.
Flexible Polyethylene



	1 1/2" to 5"	Clear	150	Stretchable	10	1056N11	000000


	1 1/2" to 8"	Clear	150	Stretchable	5	1056N14	00000
	2 1/4" to 11"	Clear	150	Stretchable	5	1056N15	00000
	2 7/8" to 16"	Clear	150	Stretchable	5	1056N16	00000
	3 5/8" to 17"	Clear	150	Stretchable	2	1056N17	00000
	4 3/8" to 24"	Clear	150	Stretchable	2	1056N18	00000

Rain Hats

These sturdy hats are made of PVC-coated polyester to resist tears and mildew. A full brim shields rain from all sides. They're washable.

When measuring head circumference, measure just above your ear, where the hat will rest. If you are between sizes, order one size up.

Full Brim Hat

Material	Coating Material	Color	Choose a Size (Head Circumference)		Each
Polyester Fabric	PVC	Yellow	S (21"), M (22"), L (23"), XL (24")	53535T65	000000

Clean Room Hair Covers

Also known as bouffants, these hair covers keep hair contained to reduce contamination. Designed for use in Class 100 clean rooms, they keep pollutants such as hair, dust particles, and microbes from contaminating a space. Use these hair covers for short- to medium-length hair.

							Each		Package
	Clean Room Std.	Material	Stretched Dia.	Performance	Color	Clothing Size		Each	Pkg. Qty.		Pkg.
Solid







				Bouffant

				Fed. Std. Class 100, ISO Class 5	Polyethylene/Tyvek Fabric	21"	Disposable, Water Resistant	White	One Size	53075T89	00000	250	53075T891	0000000

Disposable Hair Covers

Solid

Keep your hair out of the way to prevent stray hairs from contaminating food.

Bouffant—Bouffant hair covers cover your entire head. For short- to medium-length hair, use those with a 20" to 21" stretched diameter; for longer or thicker hair, choose a 24" stretched diameter.

Polyethylene/Tyvek Fabric—Polyethylene/Tyvek fabric holds up to occasional contact with nonhazardous liquids, such as water and paint spray. It is made of heat- and pressure-bonded fibers that form a barrier that's soft yet strong.

Kleenguard Polypropylene Fabric—Kleenguard polypropylene fabric is made of five layers of nonwoven fabric, so it is harder to tear than Tyvek polyethylene. It holds up to occasional contact with nonhazardous liquids, such as water and paint spray.

	Clothing Size	Color	Pkg. Qty.		Pkg.
Solid







	Bouffant

	Polyethylene/Tyvek Fabric	21"	Disposable, Water Resistant	One Size	White	10	5583T17	000000


	Kleenguard Polypropylene Fabric	24"	Disposable, Water Resistant	One Size	White	100	54165T741	00000