| 摘要 |
A furnace filter assembly for removing dirt and contamination from air entering an existing furnace is installable on the existing furnace without the need for modification thereof, and comprises a filter frame, a supply roll for supporting a continuous length o f bulk filter media, a take-up roll for receiving the filter media as it is advanced from the suppl y roll across the filter frame, a motor for rotating the take-up roll for advancing the filter media, all of which components are mounted on the filter frame. The assembly further includes a motor contr ol system having a pressure sensor, a timer, and a switch in electrical communication with a controller for energizing and de-energizing the motor in response to conditions of the filter media.</ SDOAB>
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