How to Replace Furnace Filter 20 X 25 X 5

[@donneary7104]

I can't say for sure, but I think you loaded the air filter in backward. The arrows UP would indicate going into the airflow of the furnace located above the filter. You loaded arrows DOWN.???

[@AB-ye7bw]

Is there any airflow indicator on the sheet metal housing?

[@geoall2710]

Terrible commentary and creepy