Filter with double layers; the first layer has medium sized micro-pores to capture coarse dirt particles, while the second layer has very fine sized micro-pores to capture microscopic dust particles, the most damaging.

TECHNICAL SPECIFICATIONS

Filters made of polyurethane foam, self-extinguishing, two layers coupled by a special hot forming process that does not alter its filtering characteristics.
The first layer is made of a red filtering media: open cell polyurethane foam with a porosity of 45 ppi *.
The second layer is made of a black filtering media: open cell polyurethane foam with a porosity of 60 ppi *.