SIGMA series LMH - KMH high efficiency filters meet the strictest requirements of air conditioning and ventilation systems where high levels of air cleanness are required. The filter medium is made of mini pleated glass micro-fiber paper fitted with continuous thermo-plastic separators. The frame is available in two different materials according to the models: MDF wood for LMH filters and galvanized steel sheet for KMH filters. The filter medium is fixed to the frame with a polyurethane sealant, the frame is fitted with a single piece gasket. LMH - KMH high efficiency filters have a moderate pressure drop level, a high dust holding capacity and offer considerable mechanical resistance. They come in various sizes to suit a wide range of air flow rates.