REUSABLE FILTER

摘要

The present invention relates to a filter for a gas or air stream, which filter comprises a filter membrane (14) and support means (11, 12) therefor, characterised in that the filter membrane is formed with a plurality of folds or pleats, extending in at least one direction and in that said membrane is a semi-rigid sheet comprising a porous plastics material, the arrangement being such that the support means locates and maintains said membrane within the gas stream in service and permits cleaning of the membrane for reuse.