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Class K Wet Chemical Extinguisher Unit

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Introduction: Saponification for Cooking Oil Fires

The Class K Wet Chemical Extinguisher Unit is the mandatory fire suppression device for kitchens utilizing commercial deep fat fryers, woks, and cooking appliances that use vegetable oils and animal fats. Class K (Kitchen) fires are designated due to the extremely high heat and potential for re-ignition of these fuels.

The agent is typically an aqueous solution of Potassium  Acetate (or Potassium  Carbonate), which is non-toxic and non-corrosive. When sprayed onto the fire, the agent creates a chemical reaction called saponification: the agent reacts with the hot oil to form a soapy, foam-like blanket. This blanket cools the oil below its ignition point and, crucially, prevents oxygen from reaching the surface, thereby preventing re-ignition.

Class K units feature a distinctive long, flexible discharge wand/nozzle to ensure the agent is applied gently as a fine mist, preventing splashing of the burning hot oil. (Approx. 560 words)

Advantage: Saponification, Non-Toxic Agent, and Gentle Discharge

  • Re-Ignition Prevention: Saponification creates a durable soap layer that isolates the hot oil from oxygen and air, effectively preventing the fire from flaring up again.
  • Safe Application: The fine mist and long wand allow the agent to be applied gently to the burning oil, avoiding dangerous splashing and steam expansion.
  • Code Requirement: The only portable unit specifically listed and mandated by NFPA 10/96 for commercial cooking hazards.
  • Stainless Steel Durability: The preferred stainless steel construction resists corrosion from the alkaline agent and the humid kitchen air.
  • Safe Agent: The Potassium  Acetate agent is food-safe, non-toxic, and easy to clean up compared to powders.
  • Temperature Drop: The aqueous mist provides significant immediate cooling to the surface of the burning oil.

Specification: Agent, Mechanism, and Discharge

Component FunctionChemical Saponification and Cooling for Cooking Oil Fires
Extinguishing AgentPotassium Acetate/Potassium Carbonate Aqueous Solution
Fire ClassificationK (Commercial Kitchens), also rated for A (Small)
Design TypeStored-Pressure (Nitrogen Propelled)
Discharge MethodFine Mist via Long Flexible Wand/Nozzle
Cylinder MaterialStainless Steel (Preferred for Corrosion Resistance)
Standard ComplianceUL 711/299, EN 3, NFPA 10/96 (Ventilation and Fire Protection)
Key FeatureChemical Saponification (Soap Blanket Formation)

Mandatory Kitchen Protection

Commercial Restaurants

Required by code in all kitchens with fryers, griddles, or deep-oil cooking equipment.

Food Trucks and Mobile Catering

Mandatory for mobile units utilizing high-heat cooking appliances and animal/vegetable oils.

Hospitals and Institutional Kitchens

Used alongside automatic hood suppression systems to provide immediate manual defense.

Industrial Food Processing

Applicable in processing areas where high volumes of vegetable or animal fats are heated.

Stainless Steel Construction

The cylinder and valve components are often stainless steel to resist the damp, greasy, and corrosive kitchen environment.

Grow Your Bussiness With KAITUO

  • INNOVATION

    Professional R&D Team

    We have a professional R&D team of over 15 people who are able to provide innovative products and customized design services to our customers.

  • QUALITY

    Product quality assurance

    We adhere to quality as a lifeline for our business development, and strict quality management systems ISO and CE, as well as a variety of advanced quality testing equipment are our guarantees for product quality.

  • PRODUCTION CAPACITY

    Annual output exceeds 400,000

    Every month over 400,000 pcs of kinds of valves, including fire extinguisher valve, lpg valve, marine gas cylinder valve and so on.

  • SERVICE

    One-stop service

    We have complete design, and product development, testing and quality control are all carried out in the factory, which to a certain extent guarantees the high quality and performance of Kaituo fire equipment.

Payment & Shipping: Flexible Global Trade Solutions

We offer comprehensive and secure international trade terms tailored to our global clientele.

  • Accepted Payment Methods:

    Wire Transfer (T/T): Standard 30% deposit to confirm the order, 70% balance upon presentation of Bill of Lading (B/L) copy.

    Letter of Credit (L/C): Irrevocable L/C at sight for sourcing specialty stainless steel and corrosive agent orders.

  • Shipping Terms (Incoterms):

    FOB (Free On Board): Ningbo Port is our standard shipping hub.

    CIF/CFR: Available upon request; we manage shipping logistics to your designated port.

  • Packaging:

    Units are individually boxed with the long wand/nozzle secured separately to prevent bending or damage during transit.

Comprehensive Information Summary

Minimum Order Quantity (MOQ)3,000 Units (Standard Stainless Steel K Units)
Lead Time75-90 Days (Cylinder Fabrication, Chemical Sourcing, Valve Assembly, Pressure Testing, Certification)
PackagingIndividual Boxed, Wand Protected, High-Quality Master Cartons.
CertificationsUL Listed, EN 3, NFPA 10/96 Compliance, ISO 9001.
Raw MaterialsStainless Steel Cylinder, Brass/Stainless Steel Valve, Potassium Acetate Solution, Nitrogen Propellant.
Customization OptionsCapacity (L/gal), Cylinder Finish (Brushed or Polished), Wand Length and Nozzle Flow Rate.

Professional Usage Tips

  1. Nozzle Technique:

    Train users to apply the mist gently in sweeping motions to avoid splashing the burning oil onto themselves or other surfaces.

  2. Pressure Check:

    Conduct a monthly gauge check; leakage is often caused by grease contamination on the valve stem seals.

  3. Proximity:

    Units should be located within 30 feet of the Class  K hazard as mandated by NFPA 10.

  4. Cylinder Inspection:

    During the 6-year internal service, pay close attention to the internal tank coating/welds for signs of corrosion or pitting from the agent.

  5. Hood System Lockout:

    In systems with an automatic hood suppression, ensure the fuel supply is locked out before attempting manual extinguishing.

Get in Touch

ABOUT KAITUO
Ningbo Kaituo Valve Co., Ltd., also known as Ningbo Anke Fire Equipment Co., Ltd., is China Class K Wet Chemical Extinguisher Unit Manufacturers and Wholesale Class K Wet Chemical Extinguisher Unit Factory, specializing in the research and development, production and export of fire equipment. It owns the anke brand and a number of national high-tech patents.
Founded in 2001, our company mainly provides high-quality fire protection products for the international market, specializing in the production of various types of fire extinguisher accessories, marine gas cylinder valves, gas valves, etc. After years of hard work and continuous improvement of process reform, our products are exported to dozens of countries around the world and have won a good international reputation. All of our products have obtained the EU EN, CE certification in 2007.
Welcome all customers to call and visit us. Our company has a professional sales team to provide accurate services.
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FAQ

It is the chemical reaction where the alkaline agent mixes with the hot oil to form a non-combustible soap blanket.

ABC powder lacks the cooling and saponification effect, leading to immediate re-ignition of the super-heated oil.

The Potassium  Acetate agent is non-toxic and considered environmentally safe and food-contact compatible.

It allows the user to apply the agent gently from a safe distance, preventing oil splashing and steam expansion.

The Minimum Order Quantity (MOQ) for commercial Class  K units is typically 3,000 units.

High-quality Stainless  Steel is preferred for maximum resistance to alkaline corrosion.

Yes, the agent has a high water content, giving it a small Class  A rating (e.g., 1A).

Similar to water, the working pressure is typically around 100 psi to 175 psi.

It is a stored-pressure unit, using nitrogen or dry air as the propellant gas.

NFPA 10 and NFPA 96 (Commercial Cooking Operations) mandate the use of Class  K units.