Compared with mini-pleat filter, absolute HEPA filter has larger filtering area, higher air penetration rate and lower drag force if the installation sectional module is the same and three is no limitation to the thickness of the part where the filter is to be installed. Its filtering rate against MPPS (Most Penetrating Particle Size, of 0.1um-0.3um) is higher than 99.9%. Normally, this product can be used as end filter of ventilation/filtering system, ceiling of clean room or high efficiency air outlet.