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  1. #53
    There use to be a device that would whistle when the filter got clogged but I can't find them anymore

  2. #54
    Join Date
    Jul 2004
    Location
    midwest
    Posts
    2,868
    Originally posted by fat eddy
    There use to be a device that would whistle when the filter got clogged but I can't find them anymore
    I install General AC-1 filters and they come with a gauge that mounts on the return that is supposed to tell you when to change the filter. (They like selling filters)

  3. #55
    Join Date
    Apr 2004
    Posts
    7,680
    Hook one of those differetial pressure switches to one of those anti-bark dog collars and tell the homeowner that he will indeed know when the filter gets dirty if he would just wear this around his neck.

  4. #56
    LOL

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