Opticlean - paper filter insert for absolute ultra-fine filtering of heating oil. Spin-on filters fit into any standard heating oil filter and, in contrast to conventional filter inserts, ensure a high dirt holding capacity thanks to a filter surface that is up to 37 times larger. This is the essential prerequisite for realizing filter finenesses of nominal 20 µm and absolute 35 µm separation for the first time. Even the smallest water droplets and emulsified particles are reliably separated. Particularly suitable for single-pipe systems with burner capacities up to 30 kW. For suction or pressure range -0.6 to 10 bar, filter surface 700 cm², filter fineness 20 µm nominal, 35 µm absolute, dimensions filter length 52 mm x D= 42 mm, filter cup 60 mm standard Afriso/Oventrop.