To protect metal duct systems,smoke removal and ventilation from exposure to fire and heat insulation using fire-fighting materials. They increase the fire resistance of the metal walls of the systems, thereby delaying the flame for the maximum possible time. These materials are produced in various forms. In rolls or mats produced "Ognevent-Basalt", which will be discussed in this article.
The main component of the material is especiallythin basalt fiber. From above, the material is foiled (laminated) with a grid, which can be made of metal, glass, silica or basalt fabric.
The material has several advantages:
Fire retardant coating "Ognevent-Basalt"produced in rolls or mats. The length of the roll is 6 meters, and its width is 1 meter. The thickness of the mat can be from 20 to 100 millimeters. The density of the material is 35 kilograms per cubic meter. The coefficient of fire resistance depends on the temperature remaining in the room.
Existing types of material can increase the fire resistance of duct systems from 1 to 3 hours. This parameter is already reflected in the classification:
These types of material differ in thickness, which corresponds to the technical conditions. The thicker the material, the higher the fire resistance will be.
Thus, the fire resistance limit of EI 60 reaches "Ognevent-Basalt" of 20 mm thickness. The materials EI 120, EI 150 and EI 180 are characterized by a mat thickness of 40, 50 and 70 mm, respectively.
The labeling of the material also indicates the area where it can be applied. The numbers indicate the number of sides from which it is necessary to veneer:
Letters denote the material with which the coating was coated:
Before using Ognevent-Basalt,air ducts must be prepared. If the system is made of black steel, it must be cleaned. For this, putties, brushes, sandpaper and other means of mechanical cleaning can be used. Next, the air ducts must be treated with "White spirit", solvent or any other solvent. After that, the system must be fully primed.
In cases where the duct system waspreviously primed, it must be checked and, if necessary, put in order. If the primer flakes off, it must be removed. After that, this area is degreased and primed.
If the system is made of galvanized steel, it does not need to be primed. It is enough just to clean the dust and debris. After that, it must be degreased.
After preparing the system is superimposed"Ognevent-Basalt". The material is put on the duct with the fibrous side and wrapped around it. One layer of material is enough. It is fastened with the help of metal mesh, pins with washers, metal wire bandage. Mounting pitch is selected in the range of 20-40 centimeters. If the duct diameter is more than 80 centimeters, fasteners are installed with an interval of 20 centimeters. This avoids sagging.
The edges overlap (5-7 centimeters depending on the thickness of the material). If necessary, the joints can be glued with aluminum tape.
Ognevent-Basalt does not burn.It is explosion proof. When working with this material, you must use personal protective equipment. Among them: a respirator, goggles, gloves, pastes for hands. Work with the material is allowed only with good ventilation.
