Fuchs, H.V.H.V.Fuchs2022-03-082022-03-081998https://publica.fraunhofer.de/handle/publica/303889The pane (3) made of glass or transparent plastics, or alternatively a metal, plastics or wooden plate, and between 0.1 and 10 mm. thick, is mounted in front of a rear wall (1). It is fixed in a frame, and gas is passed through the space (5) between it and the wall. It can form a gastight joint at the indoor side, and the gas can be delivered intermittently. One or more sensors can be provided, to measure temperature or humidity, the gas being supplied dependent on the values detected. Air can be used as the gas, being dried or dust-free. USE - Sound-absorber with micro-perforated components. ADVANTAGE - For false ceilings, double-glazing etc. Self-cleaning and freedom from condensation.de608624690patent1997-19710920