Replacement OEM air filter from Husqvarna. Heavy duty air filters give you the highest performance for your Husqvarna chainsaws, due to their large surface area. These filters have a medium (64 micron) nylon mesh material on the surface that picks up sawdust and debris. This filter works well in wet winter cutting conditions, and is recommended only when fine dust is not present. We recommend using a felt filter for hot, dusty situations where a lot of fine material is encountered. These filters are oil-less. These air filters breath easier than fine mesh, but will allow fine dust particles to enter the carburetor.