How to distinguish between ordinary doors and fire doors?

By checking the appearance, checking the number, reading the seal and other means, the quality of the fire door can be correctly identified, and consumers can choose reference and buy high-quality and satisfactory fire door products. How to distinguish between steel fire-proof security doors and ordinary fire doors? Steel fire-proof security door is just a name classified by function. There is no specific standard for this kind of door in the national standard, but since there is the word "anti-theft door", the relevant provisions in GB 17565- 1998 "General Technical Provisions for Anti-theft" can be applied, and all anti-theft doors must have four functions of anti-theft, heat preservation, sound insulation and fire resistance (please note that fire resistance is not fire resistance); If you want to identify, there is a simple way to check whether the opening of the door leaf (doorbell hole, cat's eye hole, lock part) is filled with fireproof rock wool, which is a yellowish thing similar to cotton silk, and it will itch when touched by hand. If so, it shows that it basically has fire prevention function; If the filler is kraft paper or the like, it has no fireproof function. Generally, hardware will not be installed before the security door is completed, for fear of unnecessary losses after it is lost. However, if the property has been taken over, hardware such as doorbell and cat's eye should be installed for the owner. This problem should be solved by property management. The main function of anti-theft door is to have good anti-prying and sealing performance. Generally, you can't open the door without a key outside the back door, and the filler in the door panel is not fireproof material. Security doors must be marked with the word "FAM" and refer to the general technical conditions of security doors. Fire doors are also made of steel, but the door panels are filled with fire-proof materials, and the thickness of door steel plates also has different requirements. Steel doors are ordinary steel doors, which also have certain anti-theft function, but the anti-prying performance is relatively poor, which is common in street processing plants.