Replacement OEM air filter from Husqvarna. Keep your chainsaw running efficiently with a clean air filter. This filter has a non woven felt material (also known as flocked or fleece) on the surface that picks up fine particles of dust. They filter very well (which is a good thing), but tend to ice up in sub freezing conditions. We recommend using a nylon mesh filter air filter when sawing in frozen conditions. These air filters are oil-less. Filters can load up quickly, so be sure to have a couple of spares handy.