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    dpow's Avatar
    dpow Posts: 1, Reputation: 1
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    #1

    Nov 22, 2014, 06:55 AM
    What size filter for model GLB130NBI
    I have an old Greenbrier / Friedrich gas furnace. What size filters are used ?
    bitters's Avatar
    bitters Posts: 348, Reputation: 12
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    #2

    Nov 22, 2014, 11:03 AM
    Measure the return duct where it enters the furnace.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #3

    Nov 22, 2014, 02:16 PM
    There should be a slot where the filter fits. Measure across both directions.
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