| 摘要 |
A furnace filter system or kit for installation on an existing furnace duct comprises upper and lower supply roll supports respectively mountable on the top and bottom wall s of the duct adjacent one side wall of the duct for removably receiving a supply roll of filter media therebetween, and upper and lower take-up roll supports respectively mounted on the top and bottom walls of the duct adjacent the other side thereof for removably receiving a filter media take- up roll therebetween. Slots are provided in the side walls of the duct inwardly adjacent the corresponding one of the supply roll and take-up roll and between the top and bottom walls of the duct, and a filter media supporting frame assembly is received in the duct and has opposite sides provided with guide slots therein aligned with the duct slots. Filter media is threaded through the supporting frame assembly from the supply roll to the take-up roll, and the latter is adapted to be periodically rotated by a motor on the upper take-up roll support to advance the filter media from the supply roll to the take-up roll. A control unit provides for the advancement of the filter media to be achieved, selectively, through one of a manual switch, timer and pressure sensor responsive to a pressure drop across the filter media in the duct.
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