Personnel and Material Decontamination Equipment

HEPA-Filtered Dynamic Pass Box

An active transfer cabinet that recirculates filtered air through its interlocked material chamber.

Internal HEPA Recirculation
Ceiling Clean-Air Supply
Low-Level Return Slots
Filter Status Monitoring

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Product Introduction

The dynamic pass box adds a self-contained fan and final-filter circuit to a double-door transfer chamber. Air returns from the lower chamber area, passes through filtration and re-enters via a ceiling diffuser to condition the payload zone. The internal loop avoids a building supply duct and can run a timed purge after the loading door closes.

Key Features

An integral fan-filter loop conditions chamber air without external ductwork.

A broad ceiling diffuser supplies air across the payload footprint.

Low-level return slots collect particles released from packaging.

A filter-pressure indicator provides a maintenance signal.

Door logic can include a purge period before receiving-side access.

Customer Product Concerns

Active transfer needs to remove particles generated inside the chamber without complicating room air balancing.

Carton surfaces shed particles after the dirty-side door closes.Repeated filtered recirculation sweeps the chamber before release.

One supply grille leaves stagnant zones around containers.A ceiling diffuser and distributed returns broaden the chamber airflow path.

A duct connection is difficult in a retrofit wall.The self-contained loop needs no room supply or return duct.

Filter loading quietly reduces the airflow.A differential-pressure display indicates rising filter resistance.

Typical Applications

Sterile material transferBiotechnology suitesMedical-device assemblyAseptic packaging support

Technical Parameters

Representative construction ranges for a HEPA-filtered dynamic pass box are shown below.

Core Material	SUS 304 double-wall chamber with EC fan, prefilter, HEPA filter and perforated return channels
Panel Thickness	80-150 mm service-plenum construction
Effective Width	500-1200 mm clear chamber width
Maximum Length	Up to 1500 mm chamber depth
Steel Facing Thickness	1.0-1.5 mm stainless-steel facing
Core Density	35-40 kg/m³ polyurethane insulation around enclosed service plenums
Thermal Conductivity	0.022-0.028 W/(m·K) for polyurethane plenum insulation
Surface Finish	Brushed or electropolished stainless chamber with smooth perforated airflow panels
Joint Type	Sealed double-wall cabinet with interlocked gasketed doors and removable filter-access panel
Customization	Available based on the intended application and operating environment.

Available Options

H13 or H14 final filterConstant-airflow controlRoom-side pressure displayWall-mounted or floor-supported body

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