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Pass Boxes


The Ventilated Pass Box equipments works to transfer material between areas with different cleanliness grade. The materials may cross the Pass Box in both directions by different handling operations through two interlocked doors. The basic unit can be variously featured with sterilization or decontamination cycle ( like germicidal lamps or hydrogen peroxide decontamination or sterilization mode ) to deliver the appropriate cleaning procedure according to the application to be performed.

A double inlet centrifugal motor-blower provides a vertical airflow in the pass-trough chamber with two interlocked doors. The “contaminated” air coming from the chamber, is aspirated by the motor-blower from the two side duct walls and then re-circulated through an HEPA filter. Part of the re-circulated air is exhausted in the not clean side (NCS) by means of an outlet located on the upper front wall, so the pressure inside the pass box is lower than the ones in the clean and dirty side.


  • The complete structure of the box is made from AISI 304L stainless steel scotch brite finishing.
  • Both doors are made from 10 mm thick safety glass with AISI 304L stainless steel hinges.
  • The HEPA filter diffuser grid is made from anodized aluminium.
  • The equipment is supplied with an HEPA filter rated H14 according to EN 1822 (99.995% efficiency @ MPPS).
  • The air cleanliness class of the working chamber in “at rest” conditions is class ISO 5 @ 0.3 and 0.5 micron according to ISO EN 14644-1 with an air velocity of 0.45 m/s measured at 300 mm from the filter. The motor blower can be adjusted to compensate the clogging of the HEPA filter.
  • All routine maintenance, filter replacement and service to the electrical board is made from the not clean side.