Spiral Duct Dampers | McMaster-Carr

Filter by

Duct Size

Component

Material

Shape

Length

Duct Type

Gauge

Gender

Blade Material

End Construction

Performance

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

Yes

REACH

Compliant

Not Compliant

Export Control Classification Number (ECCN)

EAR99

RoHS

Compliant

Not Compliant

DFARS Specialty Metals

Exempt

Airflow Damper Type

Gasketed

Standard

Opening/Closing Method

Automatic

Manual

Blade Finished Material

Overall Length

Gasket Material

Overall Width

Draft Damper Type

Width

64 Products

Airflow Dampers


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

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	ID	OD	Overall Lg.	Ga.	Gasket Material		Each		Each
Standard Airflow Damper







				Female × Male

				3	3"	2 7/8"	5 3/8"	20	—	———	0	1773K41	000000


				4	4"	3 7/8"	5 3/8"	20	—	———	0	1773K42	00000
				6	6"	5 7/8"	5 3/8"	20	—	———	0	1773K44	00000




						Male

						4	—	3 3/4"	4 1/2"	20	—	17355K59	000000	———	0


						5	—	4 3/4"	4 1/2"	20	—	17355K51	00000	———	0
						6	—	5 3/4"	4 1/2"	20	—	17355K61	00000	———	0
						7	—	6 3/4"	4 1/2"	20	—	17355K53	00000	———	0
						8	—	7 3/4"	4 1/2"	20	—	17355K63	00000	———	0
						9	—	8 3/4"	4 1/2"	20	—	17355K55	00000	———	0
						10	—	9 3/4"	4 1/2"	20	—	17355K65	00000	———	0
						12	—	11 3/4"	4 1/2"	20	—	17355K67	00000	———	0
						14	—	13 3/4"	4 1/2"	20	—	17355K69	000000	———	0
						16	—	15 3/4"	4 1/2"	20	—	17355K71	000000	———	0
						18	—	17 3/4"	4 1/2"	20	—	17355K73	000000	———	0


						20	—	19 3/4"	4 1/2"	18	—	17355K75	000000	———	0
						22	—	21 3/4"	4 1/2"	18	—	17355K57	000000	———	0
						24	—	23 3/4"	4 1/2"	18	—	17355K76	000000	———	0


						Gasketed Airflow Damper







										Male

										4	—	3 7/8"	10"	20	Neoprene	2041K31	000000	———	0


										6	—	5 7/8"	10"	20	Neoprene	2041K32	000000	———	0
										8	—	7 7/8"	10"	20	Neoprene	2041K33	000000	———	0
										10	—	9 7/8"	10"	20	Neoprene	2041K34	000000	———	0
										12	—	11 7/8"	10"	20	Neoprene	2041K35	000000	———	0

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	5078K135	000000
5	4 7/8"	Polyethylene Foam	24	5078K136	00000
6	5 7/8"	Polyethylene Foam	24	5078K121	00000
7	6 7/8"	Polyethylene Foam	24	5078K352	00000
8	7 7/8"	Polyethylene Foam	24	5078K122	00000
9	8 7/8"	Polyethylene Foam	24	5078K353	00000
10	9 7/8"	Polyethylene Foam	24	5078K123	00000
12	11 7/8"	Polyethylene Foam	24	5078K124	00000
14	13 7/8"	Polyethylene Foam	24	5078K125	00000
16	15 7/8"	Polyethylene Foam	24	5078K126	00000
18	17 7/8"	Polyethylene Foam	24	5078K354	00000
20	19 7/8"	Polyethylene Foam	24	5078K355	00000
22	21 7/8"	Polyethylene Foam	24	5078K356	000000
24	23 7/8"	Polyethylene Foam	24	5078K357	000000

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	1179N15	0000000
6	6"	5 7/8"	10 1/4"	8"	Hardwire	24	24	1179N16	000000
8	8"	7 7/8"	12 1/4"	10"	Hardwire	24	24	1179N18	000000
10	10"	9 7/8"	14 1/4"	12"	Hardwire	24	24	1179N21	000000
12	12"	11 7/8"	16 1/4"	14"	Hardwire	24	24	1179N22	000000
14	14"	13 7/8"	18 1/4"	16"	Hardwire	24	22	1179N24	000000
16	16"	15 7/8"	20 1/4"	18"	Hardwire	24	22	1179N26	000000
18	18"	17 7/8"	22 1/4"	20"	Hardwire	24	22	1179N28	000000

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

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.

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	Ga.	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

Barometric Draft Dampers

These dampers improve furnace performance by automatically opening and closing to maintain a consistent airflow despite changing environmental conditions.

Single-Acting Damper—Single-acting dampers open inward to prevent strong drafts from pulling too much heat into the chimney vent.

Double-Acting Damper—Double-acting dampers open both inward and outward to relieve pressure caused by obstructions and downdrafts.

					Steel
Draft Damper Type	For Duct Size	Ga.	For System Type	Fitting Connection		Each
Single Acting	5, 6, 7	26	Coal, Oil	Press Fit	1782K22	0000000
Single Acting	7, 8, 9	24	Coal, Oil	Press Fit	1782K24	000000
Single Acting, Double Acting	9, 10	24	Coal, Natural Gas, Oil, Propane	Press Fit	1782K13	000000
Single Acting, Double Acting	11, 12	24	Coal, Natural Gas, Oil, Propane	Press Fit	1782K14	000000
Double Acting	5, 6	26	Natural Gas, Propane	Press Fit	1782K18	000000
Double Acting	7, 8	26	Natural Gas, Propane	Press Fit	1782K12	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