The filter frame is made from anodized extruded aluminium profile with two angles in each corner to get a rigid straight filter. Each of the different types of extruded aluminium profiles contains a few sealant anchors to prevent any leakage between frame and media during the filter life. Furthermore, there are features available such as a knife for fluid seal connection or the fluid seal on the filter. All types of GP filters are available with one or two screens and EPDM gaskets. The fibreglass media pleated in ‘Minipleat-shape,’ available in four different heights (47, 56, 70 and 93mm), is cast with polyurethane sealant into the frame. This design achieves a highly active filter surface and ensures the minimal pressure drop of the GP model.