BETA series semi-absolute filters for duct flows BETA seies LS - KS semi-absolute filters offer very high filtration efficiency and low pressure drop, hence they allow for limited energy consumption levels in the systems. These filters are deep pleated version, with micro-fiber glass paper fitted with corrugated aluminum spacers; filtering pack fixed to the frame through an elastomeric sealant. LS filters have an MDF wood frame, whereas KS filters have a galvanized steel frame. Two different sizes, 149 and 292 mm with double filtering surface are available, to work with the same pressure drop but with higher air flow. All the models have high dust holding capacity and offer considerable mechanical resistance. ✓ Product ready in Stock / *1 m3/s x 10-3 = 1 l/s Technical draft Typical curves