Patent ID: 7655080

Claim:
An air cleaning and filtering system comprising: an air intake filtering part; an air outlet filtering part, which is separated from the air intake filtering part; the air intake filtering part further comprising a filtering device connected with the air inlet and the air outlet of the air intake filtering part; the air intake filtering part and the air outlet filtering part further comprising sterilizing units respectively; a waste air backflow prevention device installed at a air intake end of the filter device including a sheet hinged on one end of the air intake end and the sheet is larger than the air intake end; wherein the sterilizing unit of the air intake filtering part comprises a disinfectant container and a heating device at the bottom of a filter box; and the filtering device is installed in the filter box; wherein perforated clapboards are set in the filter box, filtering material is laid on the clapboard and the disinfectant container and the heating device are equipped below the clapboard.