Applicability discussion on energy efficiency classification of air filters

Tests the filtration performance of sixteen air filters with different filtration classification based on EN 779 standard and classifies their energy efficiency classification according to the method stipulated by EUROVENT 4/11 standard. Analysis results of the testing data indicate that the limited range of average pressure drop for fine filters suggested in EUROVENT 4/11 standard could not accurately reflect the actual energy consumption difference of the filters. Suggests that two times initial filter pressure drop should be taken as the finial pressure drop to calculate average pressure drop and energy efficiency classification should be based on average energy consumption per unit dust holding capacity.