Technologies are generally described for a system and method for assigning a task in a cloud. The unit includes a frame having a seal forming portion, first and second, first and second end seals contactable to the carrier surface to prevent carrier-axial-direction leaking of the developer, and a blade sealer sealing between the regulating member and the frame to prevent developer leaking when the regulating member is mounted. The base member can be fastened from the top into the wall with the fastener extended between the two upstanding wall members. The sensor may be a contact sensor, such as an accelerometer or an electro-resistive sensor, or the sensor may be a predictive sensor, such as a radar sensor or a machine vision sensor. Then, the air uniformly heated by the heater is blown into the coater cup through the air stream control mechanism and the filter unit.