Fire-resistant steel access doors for rooms with switchgears /Other/mercordoorsCOMPL/news,blog/qfive.jpg Machine rooms, including those where switchgears operate, require specialized doors. In order to meet strict standards and technical requirements, fire-resistant steel access doors are often used, characterized by maximum safety, good acoustic insulation and modern design. General characteristics of steel fire doors Steel doors are manufactured using a unique technology consisting in joining the sheets of their leaves by bending and riveting. Such a solution guarantees high corrosion resistance and the ideal plane of the door leaf. Steel doors (both wings and door frames) are made of galvanized steel sheet or of stainless steel sheet on the customer’s request. They are powder coated in any colour from the RAL palette, and as a standard, they are made of sheet coated in RAL 7035. The door leaf is wrapped with plastic film in order to protect it during handling and installation. It is also possible to paint the door with structural paint. The corner frame is standard, but it can also be made as internal or embracing door frame. These doors come in the following fire resistance classes: EI 30, EI 60 and EI 120. Fire-resistant steel door can be single- or double-leaf doors, internal and external, without fire resistance or refractory, solid or glazed with fireproof glass, smoke-proof in Sa and Sm classes and also with high sound insulation up to 46dB, burglar-resistant up to RC3 class according to EN 1627: 2011, made in Class 4 of mechanical strength and in Class 6 of mechanical durability, made as corrosion resistant up to class C5, and as non-rebated and rebated (with thin or thick rebates.) Such doors can have a complete range of dimensions, i.e. they can be as well wall and ceiling hatches, standard doors as large-size hinged gates. It is possible to use glazing and mcr Isotrans fire protection grilles. As accessories, you can install: various types of locks and handles/knobs, panic bars, fenders, ventilation grilles with and without fire resistance, door sills, drip caps for external doors, door closers and door coordinators. Steel fire doors comply with technical approvals, national technical assessments and have the required certificates of conformity. Fire-resistant steel access door Fire-resistant steel access doors are installed, e.g. in rooms where X-ray examinations are performed as well as in transformer substations. In the latter, the doors are specially designed, in accordance with the guidelines of energy suppliers. These are also non-sparking doors and louver doors. Usually, these are steel doors with a steel frame, provided with a ventilation grille, both in the fireproof version and without resistance to fire. All such doors with fire resistance must also be equipped with a certified closing device (door closer). Such a door can be earthed, and if it has a ventilation grille, it can be finished (profiled) in a way that prevents access to the room it closes. Fire-resistant steel access doors come in fire resistance classes: EI 30, EI 60 and EI 120. They can also be equipped with fenders made of stainless steel, which protect the lower door strip against mechanical damage. Air-tight doors (ALPE) Steel doors with increased air-tightness can be made as a door without resistance to fire or fireproof. The door leaf has a sheath structure. It is made of two sheets of galvanized steel with a thickness of 0.8mm reinforced on the inner circumference by a 2 mm thick U-profile. Both parts of the shell are joined by crimping the edges. The door leaves are filled with mineral wool. The door leaf can be glazed with 8.8mm thick P2 glass, combined with 25mm thick Pyrobel fire glass. In the doors without fire resistance, the glazing is only made of P2 glass. The glass is fixed in the door leaf through frames of cold bent steel sheet. The frames are fastened to the door leaf using M5 screws. 4 mm thick ceramic gaskets are installed between the glass and the mounting frame. The edges of the frame contacting with the surface of the door leaf and glass panes contacting with frames are sealed with silicone. The door frame is made of cold bent galvanized sheet with a thickness of 1.5mm. In addition, the structure is reinforced from the reveal side with a stiffening angle made of 2mm thick sheet metal. The door frame is a structure closed on its four sides, and its corners are joined by welding.