Production 6 - 10 working days then shipping Home Flat Filter M5 Iso Coarse 90% 437 x 525 mm MF/FAN M5 ISO COARSE 90% 437x525 mm zł38.73 Flat skeleton filter for recuperator and mechanical ventilation, dimensions 437x525 mm, filtration class M5, Iso Coarse efficiency 90% Economical low cost filter for basic filtration. Coarse pre-filter for air filtration in fan coil units, ventilation and recuperator unit. Add to cart