Amerex KP Systems

In either automatic or manual actuation the system works in this manner:

  1. When a fire starts, the detection network, consisting of fusible links or pneumatic tubing, will automatically detect the fire or the manual pull station can be used, releasing a low pH agent throughout the hood, duct and onto the appliances.
  2. Either method of actuation will interrupt gas or electrical power to the appliances preceding system discharge.
  3. The Amerex KP agent quickly suppresses the fire and cools the fuel while securing the vapors with a smothering foam reaction.

The combination of the Amerex KP system and an Amerex Model B260 or B262 Wet Chemical extinguisher provides restaurants with a “ONE-TWO” attack against the threat of business loss due to cooking operation fires.

Restaurant Kitchen Gas Appliances Protected by: Amerex KP Restaurant Fire Suppression System

General Specifications:

The Amerex KP Restaurant System is a pre-engineered, wet chemical, stored-pressure type with a fixed nozzle agent distribution network. The system is listed by Underwriter’s Laboratories, Inc., ULC and tested to U.L. Standard 300. The system shall be designed, installed and maintained in accordance with: Amerex Part No. 20150 “Design, Installation and Maintenance Manual”, N.F.P.A. 96, N.F.P.A. 17A, local codes and ordinances by an Authorized Amerex KP Systems Distributor using factory trained personnel.


The system agent is Amerex KP liquid fire suppressant, a potassium acetate based solution that suppresses cooking grease fires both through saponification and cooling. The agent has a pH of 9 or less and will not harm stainless steel surfaces under normal conditions.

Agent Cylinders: (2.75, 3.75, 4.75, and 6 Gallon)

The agent cylinders are mild steel DOT 4BW 240 specification cylinders, tested to 480 PSI (3309 kPa). The agent cylinder/discharge valve assembly is fully factory charged with Amerex KP liquid agent and pressurized to 240 PSI (1655 kPa).

Mechanical Release Module (MRM):

The mechanical release module is the spring-loaded type using a mechanical input and electrical, mechanical or pneumatic outputs. It is capable of actuating from one to ten agent cylinder/valve assemblies using one nitrogen cylinder and is operated either automatically by the detection network or manually by a remote manual pull station.

The MRM enclosure, available in either stainless steel or red painted steel has a system status indicator and a window to observe the nitrogen cylinder pressure. The enclosure has provisions for applying tamper seals after final testing or periodic maintenance. The MRM enclosure has knockouts on three sides (top, bottom & right) to accept conduit. The MRM has two SPDT micro switches pre-installed.

The MRM enclosure, available in either stainless steel or red painted steel has a system status indicator and a window to observe the nitrogen cylinder pressure. The enclosure has provisions for applying tamper seals after final testing or periodic maintenance. The MRM enclosure has knockouts on three sides (top, bottom & right) to accept conduit. The MRM has one SPDT micro switch pre-installed.


The detection network uses a continuous cable run with detectors specifically listed for use with the Amerex KP system.


The link to link system consists of four major components –
conduit connector, cable segment beginning and end, conduit box, and link to link cable segment. The link to link cable segment ensures that the links are equally spaced at 24” center to center and yields continuous linear detection from end to end of the hood.


The PRM offers superior detection by using a linear pneumatic detection system. The PRM detection system consists of the PRM, tubing and end of line fitting. The tubing is pressurized through a small “accumulator” inside the enclosure, routed throughout the hazard area. When exposed to a fire condition, the tubing ruptures, relieving all of the pressure in the tubing and accumulator thus firing the system using a nitrogen cylinder. The PRM comes complete with enclosure, accumulator, end of line fitting, connector for mechanical manual pull, two SPDT micro-switches, and “knock-outs.” It is capable of actuating up to ten cylinders and releasing two gas valves. Available in stainless or red enclosure.


The actuation cylinder is filled with 10 cu. in. of nitrogen and has an integral pressure gauge which allows easy field verification of pressure. This cylinder is capable of being refilled in the field by an Authorized Amerex KP Systems Distributor.


The agent cylinder bracket is steel, painted red, with a factory supplied discharge hose, pipe outlet or discharge fitting.


An enclosure housing an MRM and one agent cylinder is available. The pressure gauges for the nitrogen cylinder and the agent cylinder are visible without removing the front cover of the cabinet. Also available in a stainless steel single agent cylinder enclosure.


Discharge nozzles are made of chrome-plated brass, and shall consist of a one piece tip/body, strainer and blow off cap.


The manual pull stations are a “dual action” type. Both a ring pin and lever must be pulled in order to discharge the system manually.


A brass body mechanical gas valve, specifically listed by U.L. for use with the Amerex KP system, shall be installed for automatic shut off of gas whenever gas appliances are used. The valve has a “pull to close” design requiring a pull force to trip a latch which holds the valve in the open position. The cover of the gas valve has a visual indicator showing the valve’s position. Existing mechanical valves, if operating, may be used according to the listed manual.


If an electrically operated gas valve is required, it must be U.L. Listed for use with the Amerex KP system and operated by using a micro switch and a U.L. listed manual reset relay. Upon system actuation, current to the solenoid is interrupted by a micro-switch causing the gas valve to close. A manual reset relay must be used with electric gas valves.


U.L. listed electric micro switches are provided to accomplish system output functions. The switches are “stackable” inside the MRM / PRM without requiring extra mounting hardware. From one to four sets of dry form “C” contacts are available. Two factory installed micro-switches are provided.

Amerex recognized and addressed the unique hazards of  modern restaurant cooking by creating the Model B260  and B262 Class “K” Wet Chemical “Kitchen Use” fire extinguishers.

These extinguishers, along with the research and tests to develop them, have changed the way that NFPA regards cooking grease fires. After July 1, 1998, all new installations of fire extinguishers protecting cooking hazards require a Class “K” extinguisher. This class recognizes the unique nature of cooking grease which requires not only extinguishment but the cooling effect which is best obtained with WET CHEMICAL extinguishers. When the KP
System is used in combination with the Amerex Model B260 or B262 you have the perfect two step attack for kitchen fire suppression!

NFPA-10, 2010 Edition (6.6.1) “Class K fire extinguishers shall be provided for hazards where there is a potential for fires involving combustible cooking media (vegetable or animal oils and fats).”

Extinguisher Categories

Restaurant Systems

Fire Types

Class K