In contrast to cellulose filters, the polyester filter can be washed in water. The vertical model with a frame is also available. The polyester filter is more resistant than a cellulose filter. O/C and O/O are respectively Open/Close and Open/Open. An Open/Close filter has a closed (covered) end whereas the Open/Open filter is open at both ends.
Efficiency: 99.93% between 0.2 and 2 microns
Use: Removes dust and welding smoke from the air.