Personnel and Material Decontamination Equipment

Negative-Pressure Containment Pass Box

A transfer chamber held below adjacent-room pressure so leakage is drawn inward and routed to filtered exhaust.

Negative Chamber Bias
Filtered Exhaust
Controlled Make-Up Air
Pressure-Gated Interlocks

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Product Introduction

The negative-pressure containment pass box moves dusty, potent or odorous material without allowing a passive leak towards the support space. A variable-speed exhaust fan maintains the selected negative pressure, while a controlled make-up path avoids excessive suction at the door seals. A pressure signal controls the interlock logic and indicates when the chamber has recovered after a transfer.

Key Features

Closed-loop fan control responds to the measured chamber pressure.

A deliberate make-up air path limits high-velocity leakage through random gaps.

The clean-side door can remain inhibited until pressure recovers.

A sealed final-filter service panel separates captured material from the corridor.

Smooth welded internal surfaces support wipe-down after transfer.

Customer Product Concerns

The chamber needs to keep leakage inward without making doors difficult to operate or disrupting adjacent spaces.

Exhaust force makes a door difficult to unlatch.Controlled make-up air and an adjustable setpoint limit the differential pressure.

Filter loading reduces extraction and reverses the leakage direction.Pressure-responsive fan control adjusts airflow as resistance changes.

Captured powder is exposed during routine filter service.A gasketed service housing keeps handling on the designated dirty side.

The next door opens before the chamber recovers.Pressure-gated interlocks delay release until the selected negative bias returns.

Typical Applications

Potent compound transferPowder dispensing roomsHazardous sample handlingOdour-controlled process suites

Technical Parameters

Typical pressure-containment construction ranges for a negative-pressure pass box are listed below.

Core Material	Welded SUS 304 or SUS 316L chamber with variable-speed exhaust, make-up inlet and HEPA final filter
Panel Thickness	80-150 mm sealed plenum and double-wall construction
Effective Width	500-1200 mm clear chamber width
Maximum Length	Up to 1500 mm chamber depth
Steel Facing Thickness	1.2-1.5 mm stainless-steel facing
Core Density	35-40 kg/m³ polyurethane insulation around pressure and filter plenums
Thermal Conductivity	0.022-0.028 W/(m·K) for polyurethane plenum insulation
Surface Finish	Brushed or electropolished stainless chamber with smooth coved internal corners
Joint Type	Pressure-tight welded body with gasketed interlocked doors and sealed filter-service panel
Customization	Available based on the intended application and operating environment.

Available Options

Typical -10 to -50 Pa pressure rangeSafe-change exhaust filterRemote alarm contactsRoom-specific pressure setpoint

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