Filtro Cell SV , the high efficiency Mini-Pleat compact filters made up of synthetic media are available in a wide range of efficiencies from M6 - F9 (65% - 95%+ ). Filtro Cell SV are designed to use in HVAC installations where highest degree of air cleanliness is required. The compact design, larger surface area and low initial resistance made it an Ideal alternative to ordinary Bag filters & Box type filters of the similar efficiencies.