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QUESTION:After I pulled out the old 20 x 25 x 1 filter to my gas furnace and slipped
the new one in, I noticed on the side of the filter an arrow above the words
"air flow". In my haste to replace the filter, I'm not certain I put the
filter in the right direction.
The slot for the filter is external to the furnace between the air intake vent
and the furnace. Should the arrow point to the furnace or to the intake vent?
I think I can build a case that supports both directions but I guess
there is only one right way. Which is it?
ANSWER: I think the air-flow arrow is there for those thrifty folks
who remove the filter, vacuum it, and put it back.
( you dont want to put it in "backward" after doing that !! )
If you "use and toss" it shouldnt matter which way the arrow points.
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