Controlling the ingress of particulate contamination into
cleanrooms and other controlled environments is paramount in order to
maintain the integrity of products and processess. Personnel traffic
is the most important factor which must be controlled. Esco Pass
Boxes and Transfer Hatches are a cost effective solution as they
allow materials to be transferred into the controlled environment
without actual personnel movement. They may also be used to protect
the external environment from egress of contamination, for example,
in biological safety laboratory applications.
Built-in air shower significantly
reduces surface contamination on materials entering or exiting the
controlled environment. Materials entering or exiting the
controlled environment are “scrubbed” by high velocity
ULPA filtered air jets with velocities of 25 m/s (4921 fpm).
Contaminated air is then drawn through the base within the unit,
filtered and recirculated.
An array of stainless steel
nozzles direct high-velocity jets within the chamber.
Air shower duration is adjustable. Standard factory pre-set
is 12 seconds in both directions.
Air Shower Pass Box Construction
Robust construction qualifies the
air shower pass box for the most demanding controlled environment
applications. The unit is fully assembled and ready to install and
operate when shipped. All components are designed for maximum
chemical resistance and enhanced durability for a long service
Electrical interlock maintains
cleanroom integrity by preventing both doors from being opened at
the same time.
The air shower is constructed of
electrogalvanized steel sheets with an abrasion resistant
oven-baked powder coated finish.
The pass box base surface is
constructed of perforated stainless steel, making the work zone
easy to clean.
Acrylic doors provide a clear view of the internal chamber.
Blower and Filtration Systems
Esco Air Shower Pass Boxes use
German made ebm-papst® permanently lubricated, centrifugal
motor/blowers with external rotor designs. Selected for energy
efficiency, compact design, and flat profile, the completely
integrated blower assembly optimizes motor cooling, with unified
rotating parts and overall component balance for smooth, quiet,
vibration-free operation. Weight is equally distributed to all
bearings to extend bearing life.
ULPA filter(s) provide 99.999%
typical efficiency for particle sizes at 0.1 to 0.3 microns. Esco
Air Shower filters meet the IEST-RP-CC001.3 recommended practice
for HEPA performance (USA), and EN 1822 for H13 performance (EU).
A disposable pre-filter with 85% arrestance extends the life
of the main filter.
Optional UV lamp, must be factory
fitted, specify when ordering.