1.Consumers should choose suitable security door according to the size of the openings, the opening direction, color pattern and other practical requirements.
2.Anti damage function is the most important function of security door, the seller can be required to produce the relevant departments of the inspection certificate.
3.The thickness of the steel plate of the qualified security door frame shall be above 1.5mm, and the thickness of the door body is generally above 40mm, and the weight of the door should be checked, generally should be above 40kg. And by removing the cat's eye, the doorbell box or the lock handle to check the internal structure of the door body, the thickness of the steel plate should be more than 0.5mm, a plurality of reinforcing steel frame should be inside, so that the front and back panels of the door body are organically connected together, enhance the overall strength of the door body. The door is generally with polyurethane or honeycomb paper filler, with the function of thermal insulation, sound insulation. The fire doors should be filled with fireproof material as filler such as asbestos, hand percussion door body issued a "pound" sound, it should be flexible for hand opening and closing doors. Fire door production should have the national certification of the production of fire door.
4.Check process quality: special attention should be paid to check whether there is no welding defects, such as open welding, unweld, leakage etc.. The door and the door frame is closely related or not, the gap is uniform or not, open is flexible or not, all joints are compacted or not. The surface of the door panel shall be protected against corrosion, general should be spray and painting, the surface should be no bubble, uniform color, most of the door frame is embedded with a rubber seal, will not have a harsh metal crash when close the door.
5.Lock check: qualified security door is generally used qualified special security lock inspected by the public security department, at the same time, the lock should have the protection of the steel plate which thickness of more than 3.0mm. Now there are many special security lock is multi direction lock, the utility model has the advantages of not only the door lock, the bar can be inserted into the lock to fix the door, greatly increasing the security performance of the door. In China, the mechanical burglar alarm door lock is divided into general protection level and advanced level, with class A and B to indicate. A lock refers to the lock which anti destructive opening time not less than 15 minutes, the anti technical open time of not less than 1 minutes , B lock refers to the lock which anti destructive opening time less than 30 minutes, the anti technical open time of not less than 5 minutes. And in the same case, the security performance of B class security lock is 5 times than A class lock. High end security door will even use super B class lock.
6.Brand guarantee: brand is the mark of product quality and service. Buy security doors in the market, it is best to buy from a formal large home building materials city. Should also pay attention to the "FAM" logo of the security door, corporate name, the implementation of standards and other content, in line with the standard of the door can be both safe and reliable.
7.After installing a steel security door, the user should firstly check the keys, insurance, invoice and customer service service such as single parts and materials and security door manufacturers to provide parts and information are consistent, do not less any single key. Opening the lock which has been installed at the door with the key, the lock core should be easy and flexible, non card hysteresis; in the process of the door open to 90 degrees, should be flexible, no jamming, noise etc..
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