| 摘要 |
An air duct section with a cylindrical drum of washable filter material therein cradled on rollers and rotatable by a drive motor, but normally at rest. Upper and lower seal brushes are mounted to the duct and engage the drum, and water spray nozzles are provided inside and outside the drum, with timer controls on the motor and supply to the spray nozzles for rotating and spraying the drum at selected intervals, to wash accumulated deposits from the filter to a drain.
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