Pass Boxes
Faster transfer hatches are laminar flow equipment commonly known as pass boxes which provide for a clean environment in Class ISO 3 in accordance with ISO 14644-1 while transferring samples from areas classified with different air cleanliness.
According to Clean Room standards and requirements, these units may be simple transfer boxes with no filtration (passive pass box) made out of partition room walls with glass screens separating the two areas or,
stainless steel self-standing structures separating two areas both physically and dynamically with positive or negative pressure airflow pattern providing for a dynamic tightness toward the surrounding environment
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.
Operational Principles
Pass boxes devices may operate both in negative and in positive pressure without compromising the safety and cleanliness performances. The pressure pattern set up and operational mode mostly depends on the layout of the cleanroom or to meet specific standard requirements. They operate as standard in negative pressure in comparison to the pressures of the surrounding environments generating that so-called “well of pressure“.
Positive step of pressure: the inside pressure is higher in comparison to not clean side area and lower than clean side area.
Overpressure: the inside pressure is higher in comparison to not clean side and clean side areas.
Well of pressure: the inside pressure is lower in comparison to not clean side area and clean side area.
Technical Specifications
Body structure fully made in stainless steel AISI 304L press-bent metal sheets with a radius of 3 mm for easy cleaning and roughness lower than 0,8 Ra.
Stainless steel internal side surfaces made in AISI 304L with rounded corners: one-piece perforated work surface with 5 mm holes for perfect laminar flow shape made in AISI 304L stainless steel. Collecting sink below work surface in AISI 304L stainless steel.
Equalizer and protective H14 HEPA/ULPA filter diffusor grid made in anodized aluminum.
Glass screens: doors are made from 10 mm thick safety glass with AISI 304L stainless steel hinges and electro-magnetic handles to open the screen.
Filtration: Class H14 HEPA/ULPA filter. Typical efficiency of 99.995 % MPPS down to particles size of 0,12 μ according to CEN EN 1822.
Recessed control box with an opening towards cleaning area.
Functional backlit switches positioned on the frontal face of the hatch of the box with operating switches and lights indications, in both clean and dirty side area.
Available Dimensions
- (useful internal w x d x h)
- 500 x 500 x 500 mm
- 800 x 500 x 700 mm
- 800 x 800 x 800 mm
Custom dimensions and special internal arrangement are available upon request
Customisation
Passive transfer hatch (no ventilation) with UV light sanitizing cycles.
Square doors or three doors version.
Software and fittings for integration with Hydrogen Peroxide generators.
