Compressed air filter sizing.

Free-air / norm volume flow at 1.013 bar, 20 °C (as stated on your compressor / FAD rating). We convert to operating conditions internally.

Maximum acceptable pressure drop across a new clean element. The tool picks the smallest P-EG housing — and works out how many P-SRF cartridges it needs — to stay under this limit.

P-SRF is the wound borosilicate depth element (the standard). P-SRF N is the pleated borosilicate element with 0.86 m² filtration area per 10″ element, so a clearly lower ΔP at the same flow. Each has its own ΔP data and article numbers.

Initial ΔP per grade from the Ultrafilter datasheets at nominal flow: PE 0.03, FF 0.04, AK 0.07, MF 0.08, SMF 0.09 bar. The default FF / MF / SMF option uses the most conservative value (SMF). Only housings rated for your flow are offered.