The purpose of Envirotech Systems Limited is to solve the needs for sound insulation and fire resistance, offering the Acoustic Cum Fire Metal Doors. These doors were designed in order to be used in places where both noise and fire (safety) control is necessary, such as studios, control rooms, offices and industrial type constructions. These structures are built out of tough metallic ... https://www.envirotechltd.com/acoustic-cum-fire-metal-door