Guillotine Dampers | McMaster-Carr

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150 Products

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Slide open and closed

142 products

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More convenient and efficient that manual gates

8 products

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Add to your system without disassembling the run

24 products

Quick Disconnect

Disassemble quickly for frequent cleanouts

53 products

Blast Gates

Metal

Plastic

Slide these gates open and closed to control airflow to sections of duct. Unlike dampers, which regulate flow, blast gates turn flow on or off. They’re commonly used in dust collecting systems, either to direct suction or collect dust in a specific section of duct.

Aluminum with Galvanized Steel Slide—Our most popular blast gates. The body is aluminum to reduce stress on your duct and the slide is galvanized steel for strength. Both components resist rust in wet environments.

Aluminum with 304 Stainless Steel Slide—These blast gates have a 304 stainless steel slide that holds up to moisture and mild chemicals better than galvanized steel. The aluminum body reduces stress on your duct.

316 Stainless Steel—The most corrosion-resistant blast gates we offer for harsh weather and chemicals. They won’t pit or weaken from exposure to washdowns and cleaners.

ABS—The economical option, these blast gates won't dent or crack from impact.

				Overall
	Duct Size	ID	OD	Wd.	Ht.	Dp.	Features		Each
Metal







				Aluminum with Galvanized Steel Slide

				2	2"	2 5/16"	3 5/8"	6 1/4"	1 7/8"	Locking Screw	0000000	000000


				3	—	2 13/16"	4"	7 9/16"	1 7/8"	Locking Screw	0000000	00000
				3 1/2	—	3 3/8"	4 5/8"	9"	2 5/8"	Locking Screw	0000000	00000
				4	—	3 13/16"	5"	9 15/16"	1 7/8"	Locking Screw	0000000	00000
				4 1/2	—	4 3/8"	5 3/4"	11 3/8"	2 5/8"	Locking Screw	0000000	00000
				5	—	4 3/4"	6"	12 1/2"	2 1/8"	Locking Screw	0000000	00000
				6	—	5 9/16"	7"	14 1/2"	2 1/8"	Locking Screw	0000000	00000
				7	—	6 13/16"	8"	15 5/8"	2 1/2"	Locking Screw	0000000	00000
				8	—	7 13/16"	9 5/8"	18 3/4"	4"	Locking Screw	0000000	00000
				9	—	8 7/8"	10 5/8"	20 3/8"	3 7/16"	Locking Screw	0000000	00000
				10	—	9 13/16"	11 3/8"	22 3/8"	3 3/4"	Locking Screw	0000000	000000


				12	—	11 13/16"	13 1/4"	27 3/8"	3 5/8"	Locking Screw	0000000	000000
				14	—	13 11/16"	15 3/4"	30 3/8"	4 3/8"	Locking Screw	0000000	000000
				16	—	15 11/16"	17 7/8"	35 9/16"	4 3/8"	Locking Screw	0000000	000000
				18	—	17 11/16"	20 1/8"	41 1/4"	7"	Locking Screw	0000000	000000




						Aluminum with 304 Stainless Steel Slide

						2	—	2 5/16"	3 5/8"	5 7/8"	1 15/16"	Locking Screw	00000000	00000


						3	—	2 13/16"	4"	7"	1 7/8"	Locking Screw	00000000	00000
						4	—	3 7/8"	5"	9 1/8"	1 7/8"	Locking Screw	00000000	00000
						5	—	4 3/4"	6"	11 3/4"	2 1/8"	Locking Screw	00000000	00000
						6	—	5 13/16"	7"	14 3/8"	2 1/8"	Locking Screw	00000000	00000
						7	—	6 13/16"	8"	15 5/8"	2 1/2"	Locking Screw	00000000	00000
						8	—	7 7/8"	9 5/8"	18 1/8"	3 1/2"	Locking Screw	00000000	00000
						10	—	9 13/16"	11 3/8"	22 1/8"	3 3/4"	Locking Screw	00000000	000000
						12	—	11 13/16"	13 1/4"	26 3/4"	3 5/8"	Locking Screw	00000000	000000
						14	—	13 13/16"	15 3/4"	30 1/8"	4 3/8"	Locking Screw	00000000	000000
						16	—	15 7/8"	17 7/8"	34 7/8"	4 3/8"	Locking Screw	00000000	000000


						18	—	17 13/16"	20 3/16"	40 3/8"	7"	Locking Screw	00000000	000000




								316 Stainless Steel

								2	—	1 7/8"	3 1/2"	6"	2 5/16"	Locking Screw	000000	000000


								3	—	2 7/8"	5"	8 5/8"	2 7/8"	Locking Screw	000000	000000
								4	—	3 7/8"	6"	11 1/8"	3 5/16"	Locking Screw	000000	000000
								5	—	4 7/8"	7"	14 1/8"	3 5/16"	Locking Screw	000000	000000
								6	—	5 7/8"	8"	16 5/8"	3 5/16"	Locking Screw	000000	000000
								7	—	6 7/8"	9"	19 1/8"	3 5/16"	Locking Screw	000000	000000
8								—	7 7/8"	10"	21 1/8"	4 1/4"	Locking Screw	0000000	000000
9	—							8 7/8"	11"	23 5/8"	4 1/4"	Locking Screw	0000000	000000
10	—							9 7/8"	12"	26 5/8"	4 5/16"	Locking Screw	0000000	000000
12	—							11 7/8"	14"	31 7/8"	4 5/16"	Locking Screw	0000000	000000
14	—							13 7/8"	16"	36 11/16"	4 5/16"	Locking Screw	0000000	000000


16	—	15 7/8"	18"					42 1/8"	4 5/16"	Locking Screw	0000000	00000000


Plastic







								ABS

								3	—	2 7/8"	4 1/2"	8 1/8"	3 1/16"	Stay-Put Slide	00000000	0000


								4	—	3 7/8"	5 1/2"	10 1/8"	3 5/16"	Stay-Put Slide	00000000	00000
								5	—	4 7/8"	6 1/2"	12 1/8"	3 5/16"	Stay-Put Slide	00000000	00000
								6	—	5 7/8"	7 1/2"	14 1/4"	3 5/16"	Stay-Put Slide	00000000	00000

Blast Gates for Quick-Disconnect Duct

Slide these gates open and closed to control airflow to sections of quick-disconnect duct. Unlike dampers, which regulate flow, blast gates turn flow on or off. They’re commonly used in dust collecting systems, either to direct suction or collect material in a specific section of duct. Secure gates to a line using quick-disconnect clamps.

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.

			Overall
	Duct Size	ID	Wd.	Ht.	Dp.		Each
Aluminum with Galvanized Steel Slide



		3	3"	4"	7 1/16"	6 1/4"	00000000	000000


		4	4"	5"	9 1/2"	5 11/16"	0000000	00000
		5	5"	6"	11 5/8"	5 1/4"	0000000	00000
		6	6"	7"	14 5/16"	5 11/16"	0000000	00000
		7	7"	8"	15 3/4"	5 1/16"	0000000	00000
		8	8"	9 5/8"	18 1/2"	5 13/16"	00000000	00000
		9	9"	10 5/8"	20 1/16"	5 1/4"	00000000	000000
		10	10"	11 3/8"	21 15/16"	6"	00000000	000000
		12	12"	13 1/4"	26 13/16"	6 1/16"	00000000	000000
		14	14"	15 3/4"	29 7/8"	6 1/4"	00000000	000000
		16	16"	17 7/8"	34 5/8"	6"	00000000	000000


		18	18"	20 1/4"	40"	9 1/16"	00000000	000000
		20	20"	22 3/8"	43 1/4"	9 1/4"	00000000	000000
		22	22"	24 5/8"	45 3/4"	9 1/8"	00000000	000000
		24	24"	26 5/8"	51"	9 1/8"	00000000	000000


		304 Stainless Steel



				4	4"	6"	11 1/4"	5 7/8"	00000000	000000


				5	5"	7"	14 1/8"	5 7/8"	00000000	000000
				6	6"	7 15/16"	16 11/16"	5 5/8"	00000000	000000
				7	7"	9 3/8"	19 9/16"	5 1/8"	00000000	000000
				8	8"	10 1/2"	20 1/2"	5 3/4"	00000000	000000
				9	9"	11 5/8"	22 5/8"	5 1/4"	00000000	000000
				10	10"	12"	26 5/8"	5 3/4"	00000000	000000
				12	12"	14 1/2"	31 15/16"	5 7/8"	00000000	000000
				14	14"	16"	36 7/8"	5 15/16"	00000000	000000
				16	16"	18"	42 1/8"	5 9/16"	00000000	000000

Duct Clamps

Match clamps to your duct material.

	Galvanized Steel		304 Stainless Steel
Duct Size		Each		Each
3	00000000	000000	00000000	000000
4	0000000	00000	00000000	00000
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	00000000	00000
20	00000000	00000	00000000	00000
22	00000000	00000	———	0
24	00000000	00000	———	0

Self-Cleaning Blast Gates

Clear material from the gate’s track so it closes properly. Slide the blade through the body of the gate to scrape off debris, such as wood pulp. These gates open and close to direct suction or collect material in a specific section of duct.

			Overall				Aluminum with Galvanized Steel Slide		Aluminum with 304 Stainless Steel Slide
Duct Size	ID	OD	Wd.	Ht.	Dp.	Features		Each		Each
2	2"	—	3 11/16"	6 1/4"	1 15/16"	Locking Screw	00000000	000000	———	0
3	—	2 13/16"	4"	7 3/8"	1 15/16"	Locking Screw	00000000	00000	00000000	000000
4	—	3 7/8"	5"	9 9/16"	1 7/8"	Locking Screw	00000000	00000	00000000	00000
5	—	4 3/4"	6"	11 13/16"	2 3/16"	Locking Screw	00000000	00000	00000000	00000
6	—	5 13/16"	7"	14 3/16"	2 1/8"	Locking Screw	00000000	00000	00000000	00000
7	—	6 13/16"	8"	16 9/16"	2 1/2"	Locking Screw	00000000	00000	00000000	00000
8	—	7 7/8"	9 5/8"	18 7/8"	3 1/2"	Locking Screw	00000000	00000	00000000	00000
10	—	9 13/16"	11 3/8"	22 11/16"	3 11/16"	Locking Screw	00000000	00000	00000000	000000
12	—	11 13/16"	13 1/4"	27 7/16"	3 11/16"	Locking Screw	00000000	00000	00000000	000000

Easy-Install Blast Gates

Add a blast gate to your system without disassembling the run. To install, cut a thin slot in the duct for the slide blade, and then mount the collar to the outside. Gates open and close to control airflow to sections of duct. They’re commonly used in dust collecting systems, either to direct suction or collect dust in a specific section. Also known as half gates.

	Overall				Aluminum with Galvanized Steel Slide		Aluminum with 304 Stainless Steel Slide
Duct Size	Wd.	Ht.	Dp.	Features		Each		Each
3	4 1/2"	6"	2 1/4"	Locking Screw	000000	000000	00000000	000000
3 1/2	4 5/8"	7"	2 1/2"	Locking Screw	0000000	00000	———	0
4	5 1/8"	7"	2 3/8"	Locking Screw	———	0	00000000	00000
4	5 3/8"	7 1/8"	2 1/4"	Locking Screw	000000	00000	———	0
4 1/2	6"	8"	2 1/2"	Locking Screw	0000000	00000	———	0
5	6 5/8"	8 7/8"	2 1/4"	Locking Screw	———	0	00000000	00000
5	6 3/4"	9"	2 1/4"	Locking Screw	000000	00000	———	0
6	7 7/8"	10 1/2"	2 3/4"	Locking Screw	000000	00000	———	0
6	7 7/8"	10 1/2"	2 7/8"	Locking Screw	———	0	00000000	00000
7	8 1/2"	12 1/8"	2 1/2"	Locking Screw	000000	00000	00000000	000000
8	10"	13"	2 1/2"	Locking Screw	000000	00000	———	0
8	10"	13"	2 3/4"	Locking Screw	———	0	00000000	000000
9	10 3/4"	15"	2 3/4"	Locking Screw	———	0	00000000	000000
9	11"	15 1/2"	2 5/8"	Locking Screw	000000	00000	———	0
10	11 1/4"	16"	3"	Locking Screw	———	0	00000000	000000
10	11 1/2"	17 1/4"	2 3/4"	Locking Screw	000000	00000	———	0
12	13 1/8"	20"	3"	Locking Screw	———	0	00000000	000000
12	13 3/4"	19 3/4"	3 1/8"	Locking Screw	000000	000000	———	0
14	16 1/2"	23 3/8"	4 1/8"	Locking Screw	———	0	00000000	000000
14	16 1/2"	23 1/2"	4 1/8"	Locking Screw	0000000	000000	———	0
16	18 3/8"	26 1/2"	4 1/4"	Locking Screw	———	0	00000000	000000
16	18 5/8"	27"	4 1/8"	Locking Screw	0000000	000000	———	0

Automatic Blast Gates

Sync these blast gates with dust collectors, fume exhausters, and other machines to open and close automatically. More convenient and efficient that manual gates, these are controlled by a double-acting air cylinder.

Galvanized Steel—Strong and corrosion resistant for long life.

		Overall							Galvanized Steel
Duct Size	OD	Wd.	Ht.	Dp.	Voltage, V AC	Max. Pressure, psi	For Tube OD	Inlet Connection		Each
2	1 7/8"	6 3/8"	14 3/4"	6 3/16"	120	90	1/4"	Push to Connect	0000000	0000000
3	2 7/8"	6 3/8"	14 3/4"	5 3/4"	120	90	1/4"	Push to Connect	0000000	000000
4	3 7/8"	7 1/4"	16 1/4"	5 3/4"	120	90	1/4"	Push to Connect	0000000	000000
5	4 7/8"	8 1/4"	19"	5 3/4"	120	90	1/4"	Push to Connect	0000000	000000
6	5 7/8"	9 1/4"	22"	5 3/4"	120	90	1/4"	Push to Connect	0000000	000000
8	7 7/8"	11"	27 7/8"	5 3/4"	120	90	1/4"	Push to Connect	0000000	000000
10	9 7/8"	15"	33 5/8"	5 3/4"	120	90	1/4"	Push to Connect	0000000	000000
12	11 7/8"	17 1/4"	40 1/2"	5 3/4"	120	90	1/4"	Push to Connect	0000000	000000

Blast Gates for Chemical-Resistant Duct

Start and stop airflow to sections of PVC duct. These gates withstand chemicals that would break down most metal components. Secure gates to duct with PVC pipe cement (not included).

		Overall			PVC
Duct Size	ID	Wd.	Ht.	Dp.		Each
4	4 1/2"	7 1/2"	14"	5"	000000	0000000
6	6 5/8"	9 5/8"	17"	6 3/8"	0000000	000000
8	8 5/8"	11 5/8"	20 3/4"	6 3/8"	0000000	000000
10	10 3/4"	13 3/4"	24"	6 3/8"	0000000	000000
12	12 3/4"	15 3/4"	26 3/4"	6 3/8"	0000000	000000