Lennox furnace filter

Jan 04, 2019 1 Replies
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I have an old Lennox furnace with a hammock style filter. The air flows up but the filter is at the bottom. One side of the filter is blue, the other side is white. I can?t figure out whether the blue side or the white side faces up.


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replying to Ava, Imnukingfutz wrote: white side towards the incoming airflow.

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