Both front fans are filtered.
Did you not see this when you were writing your review? You should go back and add it in, along with a few pictures of the culprit. I know you haven't used filters much in the past, so you probably weren't inspecting it like you would if you had made it yourself. But don't take offense, no other reviewer noticed it either.
A filter by simply how it works, restricts air flow. Therefore, it can only be effecive if a seal exists. If a seal does not exist, the air will find the path of least resistence, and go around.
Comment