Each filter is tested and packed in accordance with American Standard IEST-RP-CC-001.3 (HEPA and ULPA Filters) or in accordance with the European standard EN 1822-1, 4&5 (testing filter elements HEPA and ULPA efficiency and scan method) or customer requested testing.
The filter frame is made from anodized extruded aluminium profile with two angles in each corner to get a rigid straight frame. The zinc coated hood with an attached collar is tie glued on top of the housing. At the damper (version A) the aerosol / pressure drop checking inlet is placed in a special middle bridge and is adjustable from downstream. The fibreglass media, which is pleated in ‘Minipleat-shape,’ is available in three different heights (47, 56 and 70 mm) and is cast into the filter frame and middle bridge. This design gives a highly active filter surface and ensures the minimal pressure drop of the HT model.