Class B Single-leaf Fire Door

Updated: 2026-09-13

Overview

The Class B Single-leaf Fire Door is a critical component in fire safety systems, designed to resist fire and smoke for a specified duration. It is commonly used in residential, commercial, and industrial buildings to compartmentalize fire hazards and protect escape routes. These doors are tested and certified to meet national and international fire safety standards, ensuring reliability in emergencies. They are available in various materials, including steel, timber, and composite, each offering different aesthetic and functional benefits.

Structure and Working Principle

Class B Single-leaf Fire Doors consist of a fire-resistant core, often made of mineral wool or vermiculite, encased in a durable outer layer. The door frame and seals are designed to expand under heat, preventing smoke and flames from passing through. The working principle relies on the door's ability to maintain structural integrity and insulation during a fire. Intumescent strips around the edges swell when exposed to heat, creating an airtight seal. This mechanism delays fire spread, providing crucial time for evacuation and firefighting.

Key Features

Key features of Class B Single-leaf Fire Doors include a fire resistance rating of 60-90 minutes, depending on the model and certification. They are equipped with self-closing mechanisms and smoke seals to enhance safety. These doors are also designed for durability and ease of use, with options for customization in terms of finish, hardware, and size. Compliance with standards such as GB 12955 (China) or UL 10C (USA) ensures their effectiveness in fire scenarios.

Application Areas

Class B Single-leaf Fire Doors are widely used in buildings where fire compartmentation is required. Common applications include stairwells, corridors, emergency exits, and between different sections of a building. They are also installed in residential apartments, offices, hospitals, and schools to meet fire safety regulations. Proper placement and installation are crucial to maximize their protective function.

Maintenance and Precautions

Regular maintenance is essential to ensure the door's functionality. This includes checking hinges, seals, and self-closing mechanisms for wear and tear. Any damage should be repaired promptly to maintain fire resistance. Precautions include avoiding modifications that compromise fire resistance, such as drilling holes or removing seals. Always follow manufacturer guidelines and local fire safety regulations during installation and use.

B2B Procurement Guide

When procuring Class B Single-leaf Fire Doors in bulk, verify certifications and test reports to ensure compliance with fire safety standards. Compare materials and fire resistance ratings to select the most suitable option for your project. Consider factors such as lead time, installation support, and after-sales service. Establish a long-term relationship with reputable suppliers to ensure consistent quality and reliability.