ANORDNING FOR RENING AV FORORENAD AVLUFT FRAN EN FABRIKSHALL INNEFATTANDE RORLIGA BAND AV FILTERMATERIAL SAMT ORGAN FOR UPPRETTHALLANDE AV VATTENDIMMA

摘要

Apparatus for cleaning exhaust air from a workshop, including a vertically-extending duct which is rectangular in horizontal cross section, a sheet of filter material in a horizontal plane covering the cross section of the duct, means for moving the filter material in the direction of the length of the cross section, and means for cleaning the filter material.