What to look for when choosing a fire door

One of the main indicators, which determine the quality of fire doors, is the limit of fire resistance, it is usually indicated in minutes. The indicator of fire resistance is the period of time during which the doors can withstand fire without losing their main protective functions. The minimum fire resistance is 15 minutes, and the maximum is 120 minutes. What is the limit of a particular door set by tests that are conducted in accordance with the requirements of the fire safety standard. After the tests, on the basis of the results obtained, the doors are certified.

Reliable fire doors, for example, such as are manufactured and sold here - cvant-plus.ru, are marked with the following data:

- the name of the product, the name of the manufacturer;

- fire resistance index;

- batch number;

- a description of the technology of manufacturing doors.

In the event that the fire door with glass, then it must be marked accordingly. On the product itself there is a marking consisting of one, two or three letters - R, E, I.

The letter R denotes the loss of the bearing capacity by the door, this complete destruction of the structure or the formation of irreversible deformation. E - loss of integrity, this is when the occurrence of deep cracks, through which fire and smoke can penetrate. I - loss of heat-insulating properties, this is when the material of the door finish from the side not exposed to direct fire exposure is heated to the maximum permissible temperature. One of these letters or a combination of them indicates the time in minutes, this is the period for which the change indicated by the letter will occur.

For example, the designation REI 30 indicates that all three indicators, or one of them, will be lost 30 minutes after the start of the impact on the intensive fire door. As shown by tests, a residential or office space will completely burn for 15-40 minutes, so the minimum fire resistance rating for a door can not be less than 15 minutes. In which direction it is necessary to open the fire door, how it should be hung - on the right or left canopy, depends on the direction in which people will move to the exit in case of a fire. In some operating conditions, the installation of door closer is required, but in general for selecting a fire door it is sufficient to take into account the above parameters.