Abstract: A diffuser device for use in disseminating air or other gaseous fluid under pressure characterized by wall structure at least a portion of which is formed of impermeable material having a multitude of normally sealed microscopic ruptures. Said wall structure, at least in the area of said ruptures, is characterized by the ability to flex when the interior wall surface thereof, which defines the diffuser chamber, is filled with air or other gaseous fluid under a predetermined level of pressure. Said ruptures are so designed that as long as the required air pressure is maintained they form a multitude of jet-like flow passages each of which has an exceedingly small diameter.