Fire extinguishers are not one-size-fits-all. Whether you’re a business owner or a homeowner in Ohio, knowing how fire extinguishers are classified and rated is essential for protecting your property and the people inside it. In this blog, we’ll break down the fire extinguisher classification system (Classes A, B, C, D, and K), explain the meaning of ratings like 2A:10B:C, and help you choose the right type for different settings—such as homes, offices, kitchens, or workshops. We’ll also explain how extinguishers are tested and rated by nationally recognized standards, and why selecting the right extinguisher is crucial for both emergency response and code compliance.
Fire extinguishers are categorized by class based on the type of fire they are designed to fight:
Some extinguishers are rated for multiple classes, such as ABC or BC, making them more versatile for general use. The class letters will always be visible on the extinguisher label.
Fire extinguishers are not only labeled with fire classes—they’re also assigned numerical ratings that tell you how effective the extinguisher is for certain fire types.
Let’s break down an example: 2A:10B:C
Class D and Class K extinguishers do not carry number ratings like A and B classes do. Instead, they are tested for effectiveness on specific types of fires and are labeled accordingly.
Different environments require different types of fire extinguishers. Here's a guide to help you determine what type you need:
An ABC-rated extinguisher is ideal for residential use. It can handle common fires involving paper, wood, flammable liquids, and electrical appliances. Keep at least one extinguisher on each level of your home, especially in the kitchen and garage.
Office environments typically need extinguishers that are rated for Classes A, B, and C. Paper products, electronics, and the possibility of flammable liquids require a versatile extinguisher such as a 2A:10B:C or 3A:40B:C dry chemical unit. Fire codes often dictate how far apart these extinguishers should be placed.
In residential kitchens, an ABC extinguisher can work for small fires. In commercial kitchens, Class K extinguishers are required to handle high-temperature grease and oil fires. These are specially designed to safely suppress cooking fires without spreading the flames.
These spaces often contain flammable liquids, tools, and electrical equipment. An ABC-rated extinguisher with a strong B rating is recommended. If you work with combustible metals, you will need a Class D extinguisher specifically designed for that type of fire.
Using the wrong type of extinguisher can actually make a fire worse. For example, spraying water on a grease or electrical fire can cause flames to spread or result in electrocution. That’s why it’s vital to know which class of extinguisher you’re using—and what it’s capable of handling.
From a legal standpoint, fire codes and OSHA regulations require that business owners provide the correct extinguishers for the types of hazards present. Insurance providers and fire inspectors will also check that extinguishers are properly rated, accessible, and in good working condition.
Selecting the right extinguisher isn’t just about safety during an emergency—it’s also about staying compliant with Ohio’s fire protection laws.
In the United States, fire extinguishers are tested and rated by nationally recognized labs such as UL (Underwriters Laboratories). These tests involve simulated fire scenarios to evaluate how effective the extinguisher is against each fire class. Only extinguishers that meet stringent performance and safety standards receive UL certification.
This label gives you confidence that your extinguisher will perform as expected during an emergency.
At Holmes Fire & Safety, we’ve been serving Ohio businesses and homeowners for over 50 years. We specialize in fire extinguisher sales, inspections, servicing, and code compliance. Whether you need an extinguisher for your kitchen, garage, office, or commercial facility, our team will help you select the right type, ensure it’s properly placed, and keep it maintained year-round.
We carry UL-certified extinguishers for all fire classes—including Class K for kitchens and Class D for metalworking shops—and our licensed technicians provide on-site inspections and routine maintenance to keep you protected and up to code.
Understanding how fire extinguishers are rated is key to fire safety—and choosing the wrong one can put lives and property at risk. Don’t take chances.
Call Holmes Fire & Safety today to schedule a fire extinguisher evaluation for your home or business. Our experts will help you find the right extinguishers for your needs, ensure they’re properly rated, and make sure your building is ready for whatever comes next.
Stay safe. Stay compliant. And trust Holmes Fire & Safety to protect what matters most.
