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how do I determine "furnace airflow" ?

ok, so I'm a little dense - or maybe a lot...I took out the old greyish filter and ready to replace with a new one, but now don't know which direction to install it. Do I point the arrow AWAY from the furnace, or TOWARDS the furnace?? Am confused about filtering the air flow , does it mean return air going into furnace or warm air going out? Also a secondary question: does the filter still do its job if it goes in backwards?

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Manage My Life
by Manage My Life
November 16th, 2011
Answered in 21 minutes
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Sam A
by Sam A Earned 1,714 community points in Building Supplies
November 16th, 2011
Answered in 2 hours
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