(US5725427-A)      Air supply duct of environmental control system for buildings includes a fabric air diffuser (1) formed by a frame (5), for attachment to the duct and an open-weave, fabric sheet (7), mounted in the frame, for changing the direction of the air exiting the sheet. Preferably, the sheet is flat and comprises a non-combustible material, coated with a soil-resistant non-combustible composition of a low surface energy polymer, particularly PTFE. Also claimed is a method for diffusing air flowing from an air supply duct, using an open-weave fabric sheet in a frame.    ADVANTAGE -   Does not accumulate dust, is lightweight and reduces noise emission.    (EP876574-A1)      Air supply duct of environmental control system for buildings includes a fabric air diffuser (1) formed by a frame (5), for attachment to the duct and an open-weave, fabric sheet (7), mounted in the frame, for changing the direction of the air exiting the sheet. Preferably, the sheet is flat and comprises a non-combustible material, coated with a soil-resistant non-combustible composition of a low surface energy polymer, particularly PTFE. Also claimed is a method for diffusing air flowing from an air supply duct, using an open-weave fabric sheet in a frame.    ADVANTAGE -   Does not accumulate dust, is lightweight and reduces noise emission.    (JP2000504101-W)      Air supply duct of environmental control system for buildings includes a fabric air diffuser (1) formed by a frame (5), for attachment to the duct and an open-weave, fabric sheet (7), mounted in the frame, for changing the direction of the air exiting the sheet. Preferably, the sheet is flat and comprises a non-combustible material, coated with a soil-resistant non-combustible composition of a low surface energy polymer, particularly PTFE. Also claimed is a method for diffusing air flowing from an air supply duct, using an open-weave fabric sheet in a frame.    ADVANTAGE -   Does not accumulate dust, is lightweight and reduces noise emission.    (US6059655-A)      Air supply duct of environmental control system for buildings includes a fabric air diffuser (1) formed by a frame (5), for attachment to the duct and an open-weave, fabric sheet (7), mounted in the frame, for changing the direction of the air exiting the sheet. Preferably, the sheet is flat and comprises a non-combustible material, coated with a soil-resistant non-combustible composition of a low surface energy polymer, particularly PTFE. Also claimed is a method for diffusing air flowing from an air supply duct, using an open-weave fabric sheet in a frame.    ADVANTAGE -   Does not accumulate dust, is lightweight and reduces noise emission.