Armored sound channel for security window at bank counter position, comprises sound reflector backed by textile layer and glass fibre mat

摘要

The armored sound channel consists of a box (1) lined with bulletproof steel (2), a sound reflector (12) and a document passer with a perforated aluminum surface (4). The sound reflector comprises an aluminum sheet (5) backed by pitch-impregnated glass fibre textile (6), with glass fibre mat (7) filling the remaining volume of the box beneath it. The armored sound channel consists of a box (1) lined with bulletproof steel (2), a sound reflector (12) and a document passer with a perforated aluminum surface (4). The sound reflector comprises an aluminum sheet (5) backed by pitch-impregnated glass fibre textile (6), with glass fibre mat (7) filling the remaining volume of the box beneath it. On the employee's side of the window the bulletproof steel has a covering of woven fibres (8).