SIGMA series high efficiency filters SagiCofim Technical features SIGMA series LMF-KMF high efficiency filters meet the strictest requirements of air conditioning and ventilation systems where high levels of air cleanness are required. The filtering media is made of mini pleated glass fiber paper with continuous hot-melt separators. The frame is available in two different materials according to the model: MDF wood for LMG filters and galvanized steel for KMG filters. The filtering media is fixed to the frame with a polyurethane sealant (LMG) or with glass fiber interposition between the pleated media and the frame (KMG). The frame has a single-piece gasket. The LMG-KMG high efficiency filters have a low pressure drop, a high dust holding capacity and offer a considerable mechanical resistance. They come in various sizes to suit a wide range of air flow rates.