Its always handy to keep a spare air filter foam in your spare parts kit, for when cleaning and re-oiling your dusty/dirty one.
Finna air filters filter the air better and let more clean air through.
The two layers of foam work effectively; the white coarse outer layer and the blue fine inner layer. After the white layer pre-filters the air, the blue layer removes the fine dust particles.
Cleanable and re-useable – saves money on replacement filters. Offers full-depth filtration – stop and holds more dirt than conventional paper air filters.