Learn More: HEPA-Filtered Recirculating Pass Through

• Recirculating HEPA-filtration adds another layer of protection against contamination for materials being transferred
• HEPA filter removes contaminating particles of 0.3 um or larger at 99.99% efficiency
• Air return slots along bottom interior of the chamber circulate air back through the HEPA filter
• Speed control knob allows adjustment of the blower RPM, increasing the airflow and pressure within the chamber
• Adjustable vent on door allows for recirculation or single-pass airflow
• Brushless DC fan motor is clean, quiet and energy-efficient
• Fool-proof automatic interlock mechanism prevents cross-contamination, is reliable and maintenance-free
• Choose between wall-mount and floor-mount models to fit your workflow

Positive Pressure Isolation vs. Biohazard Containment

The Recirculating HEPA-Filtration version of the General-Use Pass-through adds another layer of protection against contamination for materials being transferred. A blower/filter module emits a continuous, laminar flow of HEPA-filtered air from the ceiling that prevents airborne contamination from reaching senstive materials.

When run continuously, this micro-filtration system sweeps away any particles that may enter the transfer chamber when the doors are opened and maintains an extremely clean pass-through environment. The blower also slightly pressurizes the chamber, similar to the ISO-classified positive pressure utilized in a cleanroom. Because the pressurization is minimal, the pressure gauge on the unit measures the backpressure at the filter, which can be used to monitor its efficiency and remaining filter life.

The status indicator lights confirm that the pass-through is operational. The installed Minihelic gauge measures backpressure at the HEPA filter in order to determine when a replacement filter is needed.