Not replacing your furnace filter once a month or twice a week can damage your furnace motor not only that it can be extremely dangerous and may cause a fire. The filters cost about $3 or less so there is no excuse for not changing them.
However, there is more than that replacing furnace fitlers. First off look for an arrow on your furnace filter that says "air flow" if you cannot see any arrows saying "air flow" the filter should still have an image of an arrow head either at the sides or above.
When replacing the filter behind the furnace door be sure the "air flow" arrows are pointing towards the furnance.
Now if you have central air with a floor return grate it is the same deal under the grate the "air flow" arrows should be pointed down.You can tell a return grate when your central air is on ,it will not be blowing out air, but sucking the air in.
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