Complete invisibility, thermal insulation, "Airstop" draught excluders.

SEI SYSTEM prefabricated roller blind box with bottom inspection and sliding false ceiling. Made of expanded polystyrene externally reinforced with mortar, sand and additivated cement (o: cement additives). Lower aluminium profiles and interior plaster with Airstop system with dual swing(?) on the false ceiling, to guarantee a better airtightness and optimal insulation performance. The vertical walls (internal and external) are available in thicknesses of 3 to 8 cm. The box is provided with accessories: ABS extremity flanks geared for various reversible engine operations, external mounting brackets for wall anchoring, supports for the roller made of nylon bushings and/or galvanized bearings, galvanized octagonal roller and ABS cap and pulley.