Duct Airflow Dampers | McMaster-Carr

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Duplex Receptacle Outlet Box Cover

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123 Products

Airflow Dampers


Standard Airflow Damper, Female × Male	Standard Airflow Damper, Male	Gasketed Airflow Damper	Blade Airflow Damper

The simplest, most reliable way to regulate airflow in standard duct. Turn the lever to adjust the blade.

Gasketed Airflow Damper—The blade has a rubber gasket to prevent leaks better than other dampers.

Blade Airflow Damper—The most economical choice, these dampers slide into the end of duct. Drill a hole for the damper's bolt and remove the handle. Place the damper inside duct, insert the bolt through the hole, and reattach the handle.

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

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

								Galvanized Steel		Lightweight Aluminum
	Duct Size	Dia.	ID	OD	Overall Lg.	Ga.	Gasket Material		Each		Each
Standard Airflow Damper







				Female × Male

				3	—	3"	2 7/8"	5 3/8"	20	—	———	0	0000000	000000


				4	—	4"	3 7/8"	5 3/8"	20	—	———	0	0000000	00000
				6	—	6"	5 7/8"	5 3/8"	20	—	———	0	0000000	00000




						Male

						4	—	—	3 3/4"	4 1/2"	20	—	00000000	000000	———	0


						5	—	—	4 3/4"	4 1/2"	20	—	00000000	00000	———	0
						6	—	—	5 3/4"	4 1/2"	20	—	00000000	00000	———	0
						7	—	—	6 3/4"	4 1/2"	20	—	00000000	00000	———	0
						8	—	—	7 3/4"	4 1/2"	20	—	00000000	00000	———	0
						9	—	—	8 3/4"	4 1/2"	20	—	00000000	00000	———	0
						10	—	—	9 3/4"	4 1/2"	20	—	00000000	00000	———	0
						12	—	—	11 3/4"	4 1/2"	20	—	00000000	00000	———	0
						14	—	—	13 3/4"	4 1/2"	20	—	00000000	000000	———	0
						16	—	—	15 3/4"	4 1/2"	20	—	00000000	000000	———	0
						18	—	—	17 3/4"	4 1/2"	20	—	00000000	000000	———	0


						20	—	—	19 3/4"	4 1/2"	18	—	00000000	000000	———	0
						22	—	—	21 3/4"	4 1/2"	18	—	00000000	000000	———	0
						24	—	—	23 3/4"	4 1/2"	18	—	00000000	000000	———	0


						Gasketed Airflow Damper







										Male

										4	—	—	3 7/8"	10"	20	Neoprene	0000000	000000	———	0


										6	—	—	5 7/8"	10"	20	Neoprene	0000000	000000	———	0
										8	—	—	7 7/8"	10"	20	Neoprene	0000000	000000	———	0
										10	—	—	9 7/8"	10"	20	Neoprene	0000000	000000	———	0
										12	—	—	11 7/8"	10"	20	Neoprene	0000000	000000	———	0


										Blade Airflow Damper



												4	4"	—	—	—	28	—	0000000	0000	———	0


5	5"											—	—	—	28	—	0000000	0000	———	0
6	6"											—	—	—	28	—	0000000	0000	———	0
7	7"											—	—	—	28	—	000000	00000	———	0
8	8"	—										—	—	28	—	0000000	00000	———	0
9	9"	—	—									—	26	—	0000000	0000	———	0
10	10"	—	—									—	26	—	0000000	00000	———	0
12	12"	—	—									—	26	—	0000000	00000	———	0
14	14"	—	—									—	24	—	0000000	00000	———	0

Airflow Dampers for Quick-Disconnect Duct

Regulate airflow to sections of quick-disconnect duct. Often used in dust collection systems, these dampers attach with quick-release clamps. Turn the lever to adjust airflow.

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

Corrosion-Resistant 304 Stainless Steel—The most corrosion-resistant metal duct we sell outperforms galvanized steel in harsh environments. 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	Overall Lg.	Ga.		Each		Each
3	3 3/16"	8"	22	00000000	000000	———	0
4	3 15/16"	8"	22	00000000	00000	00000000	0000000
5	4 15/16"	8"	22	00000000	00000	00000000	000000
6	6"	8"	22	00000000	00000	00000000	000000
7	7"	8"	22	00000000	00000	00000000	000000
8	8"	13"	22	00000000	00000	00000000	000000
9	9"	13"	22	00000000	00000	00000000	000000
10	10"	13"	22	00000000	00000	00000000	000000
12	12 1/8"	13"	20	00000000	00000	00000000	000000
14	14 1/8"	17"	20	00000000	00000	00000000	000000
16	16 1/8"	17"	20	00000000	000000	00000000	000000
18	18 1/8"	23"	20	00000000	000000	———	0
20	20 1/8"	23"	20	00000000	000000	———	0
22	22 1/8"	23"	20	00000000	000000	———	0
24	24 1/16"	23"	20	00000000	000000	———	0

Duct Clamps

Match clamps to your duct material.

	Galvanized Steel		Corrosion-Resistant 304 Stainless Steel
Duct Size		Each		Each
3	00000000	000000	———	0
4	0000000	00000	00000000	000000
5	0000000	00000	00000000	00000
6	0000000	00000	00000000	00000
7	00000000	00000	00000000	00000
8	00000000	00000	00000000	00000
9	00000000	00000	00000000	00000
10	00000000	00000	00000000	00000
12	00000000	00000	00000000	00000
14	00000000	00000	00000000	00000
16	00000000	00000	00000000	00000
18	00000000	00000	———	0
20	00000000	00000	———	0
22	00000000	00000	———	0
24	00000000	00000	———	0

Automatic Airflow Dampers

Keep temperatures comfortable while saving energy. Control these dampers with a switch or thermostat so you’re only heating and cooling the areas that need it.

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

			Overall					Galvanized Steel
Duct Size	ID	OD	Ht.	Wd.	Electrical Connection Type	Voltage, V AC	Ga.		Each
5	5"	4 7/8"	9 1/4"	7"	Hardwire	24	24	0000000	0000000
6	6"	5 7/8"	10 1/4"	8"	Hardwire	24	24	0000000	000000
8	8"	7 7/8"	12 1/4"	10"	Hardwire	24	24	0000000	000000
10	10"	9 7/8"	14 1/4"	12"	Hardwire	24	24	0000000	000000
12	12"	11 7/8"	16 1/4"	14"	Hardwire	24	24	0000000	000000
14	14"	13 7/8"	18 1/4"	16"	Hardwire	24	22	0000000	000000
16	16"	15 7/8"	20 1/4"	18"	Hardwire	24	22	0000000	000000
18	18"	17 7/8"	22 1/4"	20"	Hardwire	24	22	0000000	000000

Tight-Seal Spiral Duct and Fittings

Gasketed fittings prevent leaks between connections without the need for tape or other sealants. Duct has a continuous seam that reinforces it for strength and long life. The rigid construction keeps its shape, even against suction from dust collectors. Duct is smooth on the inside for efficient airflow. Because of its attractive look, spiral duct is often used for exposed heating and cooling systems.

Straight Collars with Airflow Damper

Add a branch of round duct from rectangular systems and control airflow with the damper. Cut a hole, install the collar, and connect a piece of tight-seal spiral round duct.

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

Polyethylene Foam Gasket—The flange has an adhesive-backed gasket to bond the connection until you fasten with screws. The gasket also prevents leaks.

			Galvanized Steel with EPDM Gasket
Duct Size	OD	Bottom Gasket Material	Ga.		Each
4	3 7/8"	Polyethylene Foam	24	00000000	000000
5	4 7/8"	Polyethylene Foam	24	00000000	00000
6	5 7/8"	Polyethylene Foam	24	00000000	00000
7	6 7/8"	Polyethylene Foam	24	00000000	00000
8	7 7/8"	Polyethylene Foam	24	00000000	00000
9	8 7/8"	Polyethylene Foam	24	00000000	00000
10	9 7/8"	Polyethylene Foam	24	00000000	00000
12	11 7/8"	Polyethylene Foam	24	00000000	00000
14	13 7/8"	Polyethylene Foam	24	00000000	00000
16	15 7/8"	Polyethylene Foam	24	00000000	00000
18	17 7/8"	Polyethylene Foam	24	00000000	00000
20	19 7/8"	Polyethylene Foam	24	00000000	00000
22	21 7/8"	Polyethylene Foam	24	00000000	000000
24	23 7/8"	Polyethylene Foam	24	00000000	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	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

Airflow Dampers for Square Duct

Direct airflow to different zones in your facility or regulate the amount of outside air introduced to your system. Turn the lever on these dampers to adjust the blades.

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

For Duct		Overall					Galvanized Steel
Ht.	Wd.	Ht.	Wd.	Dp.	Ga.	Gasket Material		Each
12"	12"	11 3/4"	11 3/4"	5 1/2"	16	Vinyl Plastic	0000000	0000000
14"	14"	13 3/4"	13 3/4"	5 1/2"	16	Vinyl Plastic	0000000	000000
16"	16"	15 3/4"	15 3/4"	5 1/2"	16	Vinyl Plastic	0000000	000000
24"	24"	23 3/4"	23 3/4"	5 1/2"	16	Vinyl Plastic	0000000	000000
36"	36"	35 3/4"	35 3/4"	5 1/2"	16	Vinyl Plastic	0000000	000000

Drop-Ceiling Diffuser Dampers

Butterfly

Opening/Closing

Style

Radial Opening/Closing

Style

For use with drop-ceiling diffusers and ready-to-connect drop-ceiling diffusers, these dampers regulate airflow. Dampers mount to a collar.

Butterfly Opening/Closing Style—Dampers with a butterfly opening/closing style open on a middle hinge. The removable handle adjusts the damper to control airflow and is easier to adjust than dampers with a radial opening/closing style.

Radial Opening/Closing Style—Dampers with a radial opening/closing style open in a circle for more precise airflow than dampers with a butterfly opening/closing style.

	Material		Each
Butterfly Opening/Closing Style



	6	Galvanized Steel	00000000	000000


	8	Galvanized Steel	00000000	00000
	10	Galvanized Steel	00000000	00000
	12	Galvanized Steel	00000000	00000
	14	Galvanized Steel	00000000	00000


	Radial Opening/Closing Style



			6	Galvanized Steel	000000000	00000


			8	Galvanized Steel	000000000	00000
			10	Galvanized Steel	000000000	00000
			12	Galvanized Steel	000000000	00000
			14	Galvanized Steel	000000000	00000