W-Type Air FilterW-type air filter uses thick mini-pleat filter ... way,Website:http://www.jslingjie.com, featuring high air volume, low resistance and long service life, which ... efficiency (H13-H14) for options. W-type filters include box type and W type, with the frames made of plastics, ... plates etc. Standard size & parametersModelOverall sizeL×W×DRated Air Flow (m3/h)Initial resistance (Pa)H13 Dust ...