Patent ID: 8328905
Filing Date: 2012-12-11
Classification: B01D,Y10T

Abstract:
1. An air cleaner assembly comprising: a housing; a fan configured to draw air into the housing when the fan is operated; a pre-filter in the housing and configured to trap particles in the air drawn into the housing; a main filter in the housing and disposed downstream of the pre-filter; a display comprising an indicator; and a control circuit configured to control the indicator to indicate that the pre-filter should be replaced and to indicate the main filter should be replaced, individually, wherein the control circuit is configured to detect the clogging of the pre-filter, count a number (“N”) of times that clogging of the pre-filter has been detected, count a number (“M”) of times that end of useful life of the pre-filter has been detected, and control the indicator to indicate that the main filter should be replaced when Z exceeds a main filter limit, wherein Z=(N+(C×M)) and C is a correction factor.