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    stecworld's Avatar
    stecworld Posts: 5, Reputation: 1
    New Member
    		  
    #1

    Jan 12, 2014, 11:11 AM
    Furnace filter
    How do I know which direction a furnace filter should be installed in? There is a nice little arrow marked airflow on the filter, however, I don't know which direction the air is flowing. Obviously, I failed to pay attention when I took the previous filter out.

    Seriously though, why isn't there a great BIG arrow on the furnace itself?

    Anyway, I apologize for a rather lame question. Thank you for your consideration.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
    		  
    #2

    Jan 12, 2014, 11:30 AM
    Arrow points toward the air handler and away from the cold air return plenum.
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
    Ultra Member
    		  
    #3

    Jan 12, 2014, 03:19 PM
    Stecworld,
    I commend you for asking. Probably 75% of the furnaces I work on where the homeowner changed the filter, it's installed backward. I routinely use a marker to write the filter size on the return plenum with an arrow showing airflow direction.
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