I have central air and heat at my appartment I moved into about 6 months ago. Today I decided it was probably long past time to figure out how to change filters in the furnace so I poke around until I find the slot where the filter is.
However, when I pull it out, it looks like it was installed yesterday. It's perfectly clean, doesn't have a speck of dust on it. I've been using it for the past six months so I highly doubt it should look this way.
It's a really cheap fiberglass filter (Ace hardware brand), could it be defective? Could the landlord have placed it in the furnace incorrectly? Could something be wrong with the furnace? Or is this expected?
My last apartment had a permanent filter that had to be pulled out and washed every couple weeks or else it got filthy. Please help me figure out what's going on here.