The startup of a fluidized bed process unit uses an air heater to raise the temperature of the unit to the level necessary for operation of the unit to be self-sustaining in its normal operating regime without the use of torch oil. A communication channel is established between the client system and the file server, and the at least one data file is uploaded to a file transfer account associated with one or more of a sender or the at least one intended recipient. The brush seal also includes bristles which are arranged upstream with respect to the support ring, where ends of the bristles protrude radially inward beyond the support plate.