The Honeywell F52F1097 Return Grille style air cleaner is a double cell model that is POWERED BY 220 VOLTS. The original power supply is no longer available so you will need to install a step down transformer (part number 203365 also available from us) to convert this unit to 120 volts in order to replace the power supply circuit board. It can be either ceiling or wall mounted and is attached to the furnace or air handler by connecting ductwork. Maintenance on this unit consists of cleaning the collector cells and prefilter once per month.