Pressure equalisation device with filter function for housing with a dead volume

The device has an open porous element (9) comprising middle pore diameter of 5 to 50 micrometers. A fastening element (31) has a holding element made of polymer, elastomer, thermoplastic, thermoplastic elastomer or metal, and a surface coating made of elastomer or thermoplastic elastomer. The porous element is connected with a housing or a stabilization element by gluing, welding or vulcanizing. The porous element is covered by a protection element e.g. metal sieve, plastic sieve, perforated plate made of metal or plastic or mesh made of metal or plastic fibers. The porous element has an element made of nonwoven fabric with microfiber by using polyurethane treatment and siliconizing process.