Heavy Duty Abort Gates

Imperial Systems’ Heavy Duty Abort Gates are engineered to keep your employees and facilities safe. Abort gates are an NFPA-required safety device to prevent damage from sparks, fire, or filter leaks.

five Imperial Systems abort gates in the factory ready for shipment
Five Imperial Systems Heavy Duty Abort Gates ready for shipment
Field installation of an abort gate on a customer's dust collection system


An abort gate prevents a flame or burning ember from entering the dust collector.

A spark detector or broken bag detector can trigger the abort gate. If extinguishment from a spark detection system isn’t a good option, an abort gate will vent fire or sparks safely.

Leak detection or broken bag sensors can activate the abort gate if they detect a leak in the filters. This prevents harmful material from traveling back into the building.

The abort gate can be located on the return air side to redirect contaminated air.

Under some circumstances the abort gate can be located prior to the inlet of a dust collection system.


A heavy duty abort gate is installed on the inlet or outlet of your dust collector.

The abort gate needs a sensor that triggers it to close. This can be a spark detection system or broken bag detector.

Once it receives the signal, powerful electromagnets turn off, letting the gate drop.


ALERT: Heavy duty abort gates redirect sparks, fires, or contaminated air. They do not protect the system from explosions. Consult your representative for explosion prevention devices.

Abort gate diagram

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  • 10 gauge carbon steel construction and precise, strong welds ensure the most durable product
  • Electromagnets are fail-safe and use gate accelerating springs for the fastest gate closure
  • All abort gates tested prior to shipment for superior performance
  • Gates are removable and have steel gate seals
  • Gates reset with hand-crank actuator, with electric reset as an available option
  • Optional benefits include weather hoods, support structure, and ladder and service platform
  • Standard safety yellow powder coating (custom colors available)
  • Meets all NFPA standards, including NFPA 652 and industry-specific standards
Installation of an Imperial Abort Gate on a dust collection system
Abort Gate brochure

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Frequently Asked Questions

What does high speed mean?
Our gate closes in 500 milliseconds (1 second = 1000 milliseconds). NFPA mentions in 654 C.1.2.2, “There is an absolute necessity for a predictable amount of time between the detection of the spark and the actuation of the abort gate.”

The only way to achieve this “high speed” is with our spring assist and our robust “honeycomb” gate design. If you are not using a heavy gate and springs, you do not have a high speed abort gate.

How do I know what the sensor to abort gate distance should be?
Air velocity feet-per-second divided by 2 (1/2 second) = sensor to abort gate distance in feet.

Case and point: If you are running your return air velocity at 3000 FPM your sensor to abort gate distance would be 25’. With the less expensive gates that does not have the heavy gates and spring assist, the sensor to abort distance is closer to 50’ needed. This can be a real problem due to the fact that most people do not have that much distance.

Will Imperial Systems, Inc. abort gates work with any spark detection equipment?
Yes. We offer a stand alone inferred sensor to operate our gates. We can also offer the entire spark detection and extinguishment system.
Is the Imperial Systems, Inc. abort gate NFPA approved?
No. NFPA does not approve abort gates. Our Abort Gates meet and exceed all NFPA guidelines. There are no NFPA approved abort gates on the market.
Does an abort gate stop or divert and explosion?
No. Abort Gates are designed to abort sparks, fire and/or contaminated air caused by a broken bag or other system malfunction. High speed abort gates are not fast enough to stop an explosion.
Do I need additional support to hold up my abort gate?
In most cases you will need a dedicated support due to the weight of an abort gate.
Do I need a ladder and a service platform?
It is not totally necessary, but NFPA suggest that you need to regularly inspect and service your gate.
Do I have to mount the abort gate horizontally?
Yes. The gate is gravity operated with spring assist.
Can an abort gate be mounted inside?
Yes. It is important to check with your local building codes regarding venting a potential fire through the duct. They may have requirement of material thickness, gaskets, etc. The most important thing to be aware of is making sure that you are venting into a safe direction.
Why are some gates so much less expensive than others?
There are a couple of companies making abort gates that are built extremely light. Without all of the spring assist, electromagnetic actuators, hollow honey comb blade and other features, they can be made for much less. We feel that our gates are the strongest, heaviest and most reliable on the market. When an 800lb blade is slammed shut in less than a ½ of a second, it is important that the gate be built heavy. Our gates are constructed of ¼” & 3/8” plate with a 2-7/8” shaft.

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