Lennox furnace filter

[Ava]

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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[Imnukingfutz]

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

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