FIELD: building units, particularly blocks for windows, doors, including hangar doors, shop-windows and stained-glass windows production. SUBSTANCE: layered block for aperture protection, particularly for door or window opening protection comprises casing into which outer and inner sheets are installed and sealing means. Intermediate sheet is located between inner and outer sheets and spaced a distance therefrom. Intermediate sheet is inclined to vertical plane such that width of gap between outer and intermediate sheets in upper block part is less or greater than width of gap between inner and intermediate sheets in lover block part. As a result two air chambers of variable cross section are formed into block. Intermediate block has sinusoidal convexo-concave contour. EFFECT: increased efficiency. 5 cl, 7 dwg
