What is Sanmen? Is it a burglarproof, fireproof and noise-proof door?

First, anti-theft

This is the basic function of the door. The door body can be prying-proof, and it cannot be pried open with ordinary hand tools within 15 minutes. The door lock can prevent drilling and has certain scientific and technological content.

Second, fire prevention.

The door body is made of metal, which can prevent the spread of open flames and smoke and prevent the spread of fire in a certain period of time.

Third, cold protection.

There is heat insulation material in the door. If three-way doors are installed, you can't install ordinary doors.

Fourth, what is the difference between folk three-door defense and household three-door defense?

The "three-door" mentioned by the people refers to the entrance door with the functions of fire prevention, theft prevention and noise prevention. It is actually an officially recognized wooden fire door, but it is still essentially different from ordinary wooden fire doors (such as transfer door, machine door, stair door and tube well door).

Officially recognized wood fire doors refer to doors made of wood or wood products, such as door frames, door leaf frames and door leaf panels, whose fire resistance meets the requirements of GB50045-95 Code for Fire Protection Design of High-rise Civil Buildings.

Fire door is one of the facilities for building fire separation, which is usually used in firewall, stairwell entrance or pipeline wellhead, and plays an important role in reducing fire losses.

In addition, there are no so-called "two-proof doors" or "three-proof doors" in the relevant national laws and regulations, but only separate fire doors, security doors, explosion-proof doors, noise-proof doors (or soundproof doors), moisture-proof doors and thermal insulation door. The relevant state departments have carried out type inspection on the categories, and issued relevant approval certificates for the qualified categories, but never issued "two-proof doors" to a certain manufacturer or a certain type of doors.

The reason is that after the type inspection and approval of the fire doors by the National Fire Testing Center, the National Safety Testing Center will no longer issue anti-theft approval certificates for the performance of security doors, and vice versa. Therefore, the government has never recognized the formulation of "two defensive doors" and "three defensive doors".

5. Where did the "two defenses" and "three defenses" come from?

This formulation mainly comes from folk sayings. "Two-door" generally refers to steel fire and security doors, and "three-door" generally refers to wood fire, theft and noise doors.

Six, three misunderstandings about the three defense doors:

1, because steel is not flammable and wood is flammable, therefore, a wrong subconscious has been formed among people: steel can prevent fire but wood can't, steel can prevent theft and wood can't. On the contrary, I don't know that the real fire prevention principle depends on the internal fire prevention materials rather than the appearance.

2. Steel plates with a certain thickness, such as (1.2mm or more), are indeed more destructive than ordinary wooden plates. The steel entrance door sold in the market (that is, the folk security door), regardless of the thickness of the door leaf is 50 mm or 90 mm, the thickness of the panel is 0.4 ~ 0.8 mm. Who is more destructive and whose safety performance is higher?

3. The real anti-theft performance of a building does not depend entirely on the thickness of the door leaf, but mainly on the security system and electronic monitoring system of the whole community, followed by the door lock. Who has ever heard of how many people broke into houses?

Because thieves generally don't break into houses, or ask the lock opener to pretend to be the owner, or use the master key to enter, can the door leaf be thicker to solve the theft problem?