Contoured intakes and fan housing assemblies for floor care machines are disclosed. The invention further relates to a jetting device for employing the described method. The projection optics component includes a curved aperture. When producing an address for transfer according to the setting of the CPU, the transfer controller starts data transfer on the condition that the identification information corresponding to the address for transfer matches the identification information of the CPU at the setting of a transfer condition, etc. A method of installing the fan baffle includes bending two ends of the periphery of the fan baffle to clear obstructions on the motor, and then releasing the ends to allow them to come together in a planar arrangement. The circuit also has an overload current, low current, and overload voltage and low voltage protective circuit to protect the CCFL or EEFL tubes from being injured.