Patent ID: 6152998
Filing Date: 2000-11-28
Classification: B01D

Abstract:
A filter cartridge for removing dust and airborne particulates from an airflow that is flowing through a ducting of an air conditioning system which comprises:a frame formed with an aperture, said frame being positioned in said ducting for receiving the airflow in said ducting through said aperture, said airflow having airflow characteristics;a supply roller;a first container fixedly mounted on said frame for holding said supply roller;a take-up roller;a second container fixedly mounted on said frame opposite said aperture from said first container for holding said take-up roller;an elongated strip of filter medium having a first end attached to said supply roller and a second end attached to said take-up roller to extend said filter medium across said frame to cover said aperture;a computer means for analyzing said airflow characteristics in said ducting to generate a control signal when said airflow characteristics indicate said filter medium in said aperture is dirty; anda means mounted on said second container for rotating said take-up roller in response to said control signal to advance said filter medium from said supply roller to said take-up roller.