The acoustic shutter assembly (1) includes at least one window pane (2, 3) arranged in a frame (4). At least one ventilation duct (7) is arranged in the frame between an outer ventilation opening (8) and an inner ventilation opening (9), extending between a first layer of sound absorbing material arranged at an inside (5) and a second layer of sound absorbing material arranged at an outside. A number of acoustic reflectors (12) in the form of plate material are arranged between the first and second layers of sound absorbing material so that the ventilation duct is separated into a number of respective ventilation channels (13) formed between the acoustic reflectors. Each ventilation channel changes direction at least once between the outer ventilation opening and the inner ventilation opening, thereby at least substantially blocking any linear path from the outer ventilation opening to the inner ventilation opening.

An energy-saving security composite window comprising a peripheral side frame and glass installed on the side frame, in which the side frame is of composite structure. A rectangular high strength metal pipe is located centrally to serve as a main body of the side frame and a cavity of the rectangular high-strength metal pipe is filled with a filling material. A plurality of non-metal profiles are respectively fixed on an outer surface of the rectangular high-strength metal pipe, and an installation groove for installing glass is formed between the rectangular high strength metal pipe and the non-metal profile. An external profile is a metal alloy material, a wooden material, a plastic material, or a glass material fixed on an outer surface of the non-metal profile. The performances of external windows of buildings, such as heat insulation, heat preservation, energy saving, sound insulation, and wind pressure resistance, is improved.

Described herein is an acoustic structural panel having a first exposed major surface opposite a second exposed major surface and side surfaces extending between the first and second exposed major surfaces, the acoustic structural panel comprising a first protective layer comprising at least a portion of the first exposed major surface, a second protective layer comprising at least a portion of the second exposed surface, a core structure located between the first and second protective layers, the core structure comprising, a foam body; and a fibrous body, wherein the first major exposed surface of the acoustic structural panel comprises a plurality of apertures exposing the fibrous body.

Described herein is an acoustic structural panel having a first exposed major surface opposite a second exposed major surface and side surfaces extending between the first and second exposed major surfaces, the acoustic structural panel comprising a first protective layer comprising at least a portion of the first exposed major surface, a second protective layer comprising at least a portion of the second exposed surface, a core structure located between the first and second protective layers, the core structure comprising, a foam body; and a fibrous body, wherein the first major exposed surface of the acoustic structural panel comprises a plurality of apertures exposing the fibrous body.

An energy-saving security composite window comprising a peripheral side frame and glass installed on the side frame, in which the side frame is of composite structure. A rectangular high strength metal pipe is located centrally to serve as a main body of the side frame and a cavity of the rectangular high-strength metal pipe is filled with a filling material. A plurality of non-metal profiles are respectively fixed on an outer surface of the rectangular high-strength metal pipe, and an installation groove for installing glass is formed between the rectangular high strength metal pipe and the non-metal profile. An external profile is a metal alloy material, a wooden material, a plastic material, or a glass material fixed on an outer surface of the non-metal profile. The performances of external windows of buildings, such as heat insulation, heat preservation, energy saving, sound insulation, and wind pressure resistance, is improved.

Electronics rack door assemblies are provided to hingedly mount an air inlet or an air outlet side of an electronics rack, and be rotatable between closed and open positions. The door assembly includes a door frame, to hingedly mount to the electronics rack, with an opening to facilitate a flow of air through the electronics rack. The door assembly further includes an acoustical panel pivotably coupled to the door frame and aligned, at least in part, over the opening in the door frame. With the door frame hingedly mounted to the electronics rack at the air inlet or outlet side, the acoustical panel automatically pivots from an operation position relative to the door frame with the door frame in the closed position, to an at least partially collapsed position relative to the door frame with the door frame in the open position.

Electronics rack door assemblies are provided to hingedly mount an air inlet or an air outlet side of an electronics rack, and be rotatable between closed and open positions. The door assembly includes a door frame, to hingedly mount to the electronics rack, with an opening to facilitate a flow of air through the electronics rack. The door assembly further includes an acoustical panel pivotably coupled to the door frame and aligned, at least in part, over the opening in the door frame. With the door frame hingedly mounted to the electronics rack at the air inlet or outlet side, the acoustical panel automatically pivots from an operation position relative to the door frame with the door frame in the closed position, to an at least partially collapsed position relative to the door frame with the door frame in the open position.

A passive ventilation panel and system, in particular for use in doors, ceilings, walls and partitions enables an exchange of supply and return air for at least one room or a room, without the need for additional ventilation equipment, such as ducts, and without the needs to install wall openings or grills for the supply and exhaust air in the space.

A passive ventilation panel and system, in particular for use in doors, ceilings, walls and partitions enables an exchange of supply and return air for at least one room or a room, without the need for additional ventilation equipment, such as ducts, and without the needs to install wall openings or grills for the supply and exhaust air in the space.

A sliding window to close off an open surface in a wall separating the inside from the outside. The window includes an opening panel, a frame and a passive acoustic silencer. The silencer includes two parallel and acoustically absorbent slides extending in a median plane normal to the open surface. One slide is attached to the opening panel and the other slide is attached to the frame. The movement of the opening panel relative to the frame creating, between the slides, a slit having a thickness equal to the window opening. Also, a system of windows to acoustically damp between the inside and outside of an open space in a wall.