A waste-toner housing device that is detachably attached to an image forming apparatus for housing waste toner includes a waste-toner container and a first conveying member and a second conveying member that convey the wasted toner. A controller is provided that transmits a heartbeat signal to a monitoring station within a given time period and awaits an acknowledgement signal from the monitoring station. A first member couples the nacelle to the core cowl and includes a first flap hingedly coupled to each sidewall of the first member. The first solvent and the second solvent have different evaporation temperatures. A receive signal strength indicator may generate a differential receive signal strength indication signal based, at least in part, upon a voltage across the first and second differential output terminals. In one aspect the invention provides a method of controlling the temperature of the engine by opening the valve in response to engine monitoring.