Security doors primarily serve to prevent theft, with aesthetics being a secondary consideration. When purchasing, it's essential to focus on the door’s anti-theft performance and overall quality. In terms of production, southern manufacturers tend to emphasize design and fashionability, while northern producers often prioritize durability and material strength, sometimes at the expense of visual appeal. To ensure both form and function, it’s best to choose well-known brands. A genuine security door uses standardized materials and technologies, and if the price is unusually low, it may not meet safety requirements—especially in rural markets. Buying a cheap door can lead to greater losses due to potential quality issues.
Key features of a qualified security door include:
1. Door size and opening direction: Standard household doors come in four main sizes, represented by four digits indicating width and height. For example, a door that fits a 1-meter wide and 2.1-meter high opening would be labeled as 1021. Common sizes include 0920, 0921, 1020, and 1021. The door can open inward or outward, and each option has left or right-handed configurations based on how it opens.
2. Surface quality and structure: A genuine security door must comply with national standards. The steel frame should be at least 2 mm thick, and the front and back panels should be between 0.8–1 mm thick. Inside, there is a framework and reinforcing plates filled with foam, asbestos, or honeycomb paperboard to increase structural integrity. The door should sound solid when tapped, and the lock must be an anti-theft type. The surface should be painted or coated with no bubbles or color inconsistencies, and the door should weigh over 40 kg. Rubber seals are often installed to reduce noise during operation.
3. Hardware safety: The most critical component is the anti-theft lock. It should be certified by an official authority and offer protection against drilling, sawing, smashing, pulling, and technical entry. Locks can be single-point or multi-point. Multi-point locks provide better security by locking at multiple points around the frame. The bolt extension for A-class doors should be at least 14 mm, and B-class should be 20 mm. The lock casing should be made of sturdy materials, with reinforced parts like anti-drill plates to enhance security.
Hinges also play a role in security. They connect the door to the frame and support its weight. Built-in hinges are suitable for outward-opening doors, while external ones are used for inward-opening doors. The hinge shaft diameter should be at least 12 mm, and the edges should be welded for added strength.
When buying a security door, consider the following:
1. Purchase from a manufacturer with a valid "Production License Registration Certificate" issued by the public security department.
2. Check for recent inspection reports from authorized agencies. Ensure the batch number and model match the actual product.
3. The door must have a product tag code with information such as the security level (A, B, C), where C offers the highest protection, followed by B, then A. A-grade doors are suitable for most households, as they require at least 15 minutes to break into using basic tools.
4. Inspect the materials for thickness and finish. The steel should be smooth, without roughness or blistering. A heavier door usually indicates better quality.
5. Look for a reasonable structure and fine craftsmanship, with even and tight welds.
6. Test the lock mechanism to ensure it operates smoothly. The door should open and close without sticking or making loud noises.
7. Check the gap between the door leaf and frame. The top, left, and right sides should be no more than 3 mm, while the bottom can be up to 5 mm.
8. Ensure the door is equipped with an anti-theft chain that is securely installed and easy to use.
9. Verify that the invoice and contract clearly state the name, specifications, quantity, price, and total amount of the door.
10. Keep contact details of the seller and manufacturer to address any quality issues quickly.
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