The market is flooded with an increasing number of fire doors, and Grade A steel fire doors have become the most popular choice among consumers. Known for their excellent fire resistance, they are widely appreciated for their safety and reliability. So, what exactly makes Grade A steel fire doors so special? Let’s explore!
What Makes Class A Steel Fire Doors Stand Out?
One of the common types is the reinforced wooden door, often used indoors, also known as a steel-wood door or steel-wood composite door. These doors feature a steel framework inside, covered with MDF or wood panels. Some models use a three-layer structure—steel plate + wooden grid + steel plate—with a PVC film on the surface that mimics real wood grain. They are free from harmful substances, durable, and resistant to warping or cracking. Plus, they offer a warm, natural look without the cold feel of metal. Their affordability makes them a great option for many households.
Steel-wood doors combine the best features of solid wood and composite doors while addressing their shortcomings. They are easy to install, saving time, labor, and costs. The door frame, leaf panel, and reinforcement are made from cold-rolled steel plates. The thickness typically ranges from 1.2mm to 1.5mm for the door frame, 0.8mm to 1.2mm for the panel, and 1.2mm to 1.5mm for non-screw holes. For areas with screw holes, the steel should be at least 3.0mm thick. The door should be filled with non-combustible materials for enhanced fire protection.
Hardware components like locks, hinges, and bolts are tested to withstand temperatures of at least 950°C. Double doors come with a cover and a door closer, while the door frame includes a sealing groove. During fire resistance testing, these doors maintained integrity for over 54 minutes, with the back surface temperature rising by an average of 57.3°C and up to 98.8°C at its highest point. This means the fire resistance limit exceeds 1.2 hours, making them highly effective in emergency situations.
Key Specifications of Grade A Steel Fire Doors
1. The door leaf is made of composite plastic panels with embossed wood ribs, offering resistance to deformation, impact, and environmental harm. It is free from paint, formaldehyde, and radiation, and provides insect-proof, moisture-proof, and insulation properties.
2. The door frame is constructed from 2cm or thicker laminated wood and solid wood, finished with high-quality PVC film. It is resistant to warping, cracking, and offers an eco-friendly, aesthetically pleasing finish.
3. The door lines are made from high-quality wood-plastic extrusion, which is waterproof, moisture-resistant, and environmentally friendly. Installation is simple, and no nail holes are required.
4. After installation, the door leaf, frame, and lines form a complete, elegant design with clear texture and a luxurious appearance.
While Grade A steel fire doors offer numerous benefits, they do have some drawbacks. They can be more expensive than other options, and if not properly maintained, they may warp or deform, especially in northern climates where humidity and temperature changes are more extreme. Additionally, their weight can make them challenging to handle during installation.
Installation Tips for Grade A Steel Fire Doors
When installing steel fire doors, it's important to prevent bending or warping of the door frame. A wooden support should be placed along the width of the door frame. The base of the door frame should be embedded 20mm below the floor level, then welded to the wall’s embedded parts. Next, drill a hole in the upper corner of the door frame and fill it with a concrete mix of cement, sand, and expanded perlite (in a ratio of 1:2:5). Once the concrete has set, the door is ready for use.
That’s a quick overview of Grade A steel fire doors. I hope this information helps you make an informed decision. For more home decoration tips and updates, stay tuned to our website.
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