Personnel and Material Decontamination Equipment

Vertical Unidirectional-Flow Pass Box

A pass box that delivers a broad vertical filtered airflow over the payload and returns it through low-level channels.

Full-Ceiling Filter Face
Vertical Air Sweep
Perforated Payload Support
Airflow Status Display

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Product Introduction

The vertical unidirectional-flow pass box is designed for sensitive components that benefit from a stable downward air path. Its fan pressurises a full-ceiling final filter, while a perforated work surface and lower side returns continue the flow around the load. A velocity indication and door sequence help restore the airflow field after loading.

Key Features

A full-ceiling filter face limits dead zones above wide trays.

Lower perforated returns collect air along both payload sides.

The open support surface allows air to pass beneath containers.

An EC fan can compensate for normal filter resistance increase.

Airflow status indication supports routine operating checks.

Customer Product Concerns

Critical transfers need broad coverage around the payload rather than a turbulent jet from one corner.

A small grille leaves low-velocity pockets over trays.A full-ceiling filter face distributes air across most of the chamber.

A solid floor blocks the downward airflow beneath containers.A perforated shelf and side returns maintain the path below the load.

Filter loading weakens the intended airflow.Fan adjustment and velocity display make the condition observable.

Loading-door turbulence remains when the receiving door opens.A programmed purge allows the vertical sweep to settle before release.

Typical Applications

Aseptic component transferSterile filling supportCell-culture suppliesOptical component movement

Technical Parameters

Representative dimensions for a vertical unidirectional-flow pass box are provided below.

Core Material	SUS 304 or SUS 316L chamber with EC fan, ceiling HEPA filter and perforated low-level returns
Panel Thickness	100-180 mm airflow-plenum and double-wall construction
Effective Width	600-1200 mm usable chamber width
Maximum Length	Up to 1500 mm transfer depth
Steel Facing Thickness	1.0-1.5 mm stainless-steel facing
Core Density	35-40 kg/m³ polyurethane thermal and acoustic plenum insulation
Thermal Conductivity	0.022-0.028 W/(m·K) for polyurethane plenum insulation
Surface Finish	Brushed or electropolished chamber with smooth perforated return and support panels
Joint Type	Airtight welded chamber with gasketed filter frame and electronically interlocked flush doors
Customization	Available based on the intended application and operating environment.

Available Options

Nominal 0.30-0.45 m/s face velocityGel-seal final filterVelocity and pressure monitoringRemovable perforated shelf

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