are a nominal four inches deep. They are designed
for use in most commercial and industrial HVAC
systems where medium to high efficiency filtration is
required. They are available in average efficiency
ranges of 60-65%, 80-85% and 90-95% per ASHRAE
Standard 52.1 atmospheric dust spot test methods.
PrecisionCell II filters are especially suitable for
variable air volume systems and are designed to
operate at face velocities from 0-625 fpm. Two
styles are available: standard box style and an
optional headered (top and bottom) version that is
manufactured with a header for use with existing
side access housings (see Optional Model).
PrecisionCell II filters are UL 900 Class 2 listed.
