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    Bogey22's Avatar
    Bogey22 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 12, 2014, 11:32 AM
    Lennox ml 180uh
    My furnace is 2yrs old. When new I upgraded my filters to the new 3M - Micro filters and the motor started howling/wining/screaming, you know what I'm saying.
    I realized that it must be a "high velocity" filter. So I replaced the original one back, that looks like cobwebs.
    Then after the sound stopped.
    Since then I always replace every 3 months. With same 'useless' filter, not a problem.


    Now that it's 2 years old, unserviced, I am hearing the same sound but quieter, inspire of new 'high velocity' filters.


    Looks like I'll have to call their 'Stealership' after only 2 years :(
    Could the problem be condensate obstruction?
    bitters's Avatar
    bitters Posts: 348, Reputation: 12
    Full Member
    		  
    #2

    Oct 12, 2014, 11:49 AM
    The cheap filters are OK if you change them every 2 months. I wouldn't think the condensate would be causing this problem. What is the size of your return duct?
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