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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 *.
(*ppi: pores per inch)
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