Regular filters have something sticky sprayed on them at the factory.
Pressure drop of a pleated filter is 2.5 times the pressure drop of a
regular fiberglass filter at the same air flow. If any of you will
post your email address with spaces around the "dot", I will email you
an article on high efficiency filters that explains all this. It is in
MS Word format.

Stretch
sixfoot7 @ sccoast . net