Re: Fram Air Filters
I would think that any filter that claims to allow a greater air flow would most likely allow larger paticles to pass through.....unless there was (for instance) just one straight piece of filter material (not the dozens of pleats)....but then the life expectancy would be short before it would clog up.
When you think about it ....as a filter accumulates stuff on the surfaces...it probably only allows smaller & smaller particles to pass. So I would guess as it's used it actually filters better....but the volume of air moved would be decreasing.
But then my thought processing may be deteriorating as I just became a grandfather this week!!!