Aristo retractable stairs have a sandwiched sheet-metal led, which is built into the ceiling. The lid is lined with thermal and fire-resistant insulation. The gap between the lid and frame is sealed with fire-resistant foam tape.
The frame’s construction is fitted with a folding ladder attached to the lid. The whole space of the stairs is enclosed from above by an insulating lid. Both doors in the standard design are fitted with a special mechanism for synchronization.
Fire resistance has been tested in a test lab using a drywall ceiling. Aristo retractable stairs fulfil two basic requirements: 45-minute fire resistance and thanks to the system of sandwiched lid, the heat transfer coefficient U = 0.66 W/m2.K.
|Lid:||sandwiched: a wooden ram treated with a fungucidal solution to rid of mold, fungus and mushrooms; the insert is enclosed by galvanized sheet metal; while the ceiling part is painted white and covered with a protective film|
|Insulation:||yes, k = 0.66 W/m2.K|
|Fire resistance:||yes, EI145/EI245/EW45|
|Frame colour:||white RAL covered with a protective film|
|The colour of the steps:||grey RAL|