On Wednesday, November 2, 2016 at 9:14:05 PM UTC-4, Allie wrote:
replying to trader_4, Allie wrote:
Trouble is, this is a brand new unit. I never had to replace filters that were
this dirty after one month.

Put a crap filter, like those cheap 1" fiberglass ones, in a dirty
air stream, with particles from large down to smoke size. Take a
Merv 14 and put it into the same dirty air stream. The MERV will
dirty up quickly, the fiberglass crap one could last orders of
magnitude longer, because it's not catching much. And a decent
MERV 14 filter will have the deep pleats so that it can take more
dirt, while still maintaining a low pressure delta.