Abstract

An air filter system in accordance with the present invention includes a filter housing that defines an airflow channel. A supply roll of a filter medium, and a take-up roll for receiving the filter medium from the supply roll are positioned parallel to each other in the airflow channel. A plurality of wire mesh diverter-screens are positioned between the supply roll and the take-up roll to establish a tortuous path for statically positioning the filter medium across the airflow channel. Periodically, the take-up roll can be rotated to draw replacement filter medium into position on the tortuous path.

IPC Classes  ?

• B01D 46/20 - Particle separators, e.g. dust precipitators, using filtering belts the belts combined with drums
• B01D 46/18 - Particle separators, e.g. dust precipitators, using filtering belts
• B01D 46/40 - Particle separators, e.g. dust precipitators, using edge filters, i.e. using contiguous impervious surfaces

Abstract

A control unit is provided for monitoring the efficacy of an air filter in the ducting of an operating HVAC system. Specifically, the control unit monitors airflow velocity in the ducting to evaluate and control the power requirements that are necessary for the HVAC system to maintain a constant airflow velocity in the ducting of the system. In accordance with the present invention, the power requirements are measured and evaluated during the duty cycle of an air filter, to thereby determine when the air filter needs to be removed or replaced.

IPC Classes  ?

• B01D 46/18 - Particle separators, e.g. dust precipitators, using filtering belts
• B01D 46/46 - Auxiliary equipment or operation thereof controlling filtration automatic
• F24F 11/30 - Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
• F24F 11/39 - Monitoring filter performance
• F24F 11/74 - Control systems characterised by their outputsConstructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
• F24F 11/77 - Control systems characterised by their outputsConstructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
• B01D 46/44 - Auxiliary equipment or operation thereof controlling filtration
• B01D 46/00 - Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
• F24F 13/28 - Arrangement or mounting of filters
• F24F 110/30 - Velocity