Cleanroom Dynamic Pass Box

Cleanroom Air Control Systems & Dynamic Pass Boxes

In the delicate ecosystem of a sterile facility, the transfer of materials is often the most vulnerable point for contamination. Metrolabs provides high-accuracy Air Control Systems and Dynamic Pass Boxes, engineered to serve as a pressurized, filtered gateway between different ISO-class zones.

Unlike static boxes, our Dynamic Pass Boxes act as a localized cleanroom environment, utilizing active filtration to “scrub” materials of any surface particulates before they enter the sterile suite.

The Dynamic Pass Box: An Active Filtration Gateway

A Metrolabs Dynamic Pass Box is a self-contained structural unit that maintains a higher internal pressure than the surrounding rooms, ensuring a constant “outward” flow of air when doors are opened.

Integrated HEPA Filtration

The core of the dynamic system is its ability to self-purify. Recirculatory Airflow: Air is drawn from the chamber, passed through a G4 Pre-filter, and forced through a H14 HEPA Filter (99.997% efficiency). Class 100 Environment: The internal chamber maintains Grade A air quality, ensuring that any dust or microbes introduced during loading are immediately filtered out.

High-Accuracy Airflow Monitoring

Our systems are equipped with integrated Differential Pressure Sensors to monitor the health of the internal filters and the pressure stability of the chamber.

Electromagnetic Interlocking System

To prevent the breach of the cleanroom's pressure gradient, our systems utilize a fail-safe interlocking logic. Sequential Access: Only one door can be opened at a time. If the "dirty side" is open, the "clean side" remains hermetically locked. Visual Status Indicators: High-visibility LED lights (Red/Green) signal to personnel when the chamber is safe to access or undergoing a cleaning cycle.

Engineering & Material Specifications

Feature	Metrolabs Dynamic Standard	Benefit
Material	Grade SS 304 or SS 316L	Resists corrosion and microbial growth.
Filtration	H14 HEPA + G4 Pre-filter	Ensures 99.997% removal of particulates.
Interlock	Electromagnetic (Logic-based)	Prevents cross-contamination during transit.
Lighting	UV-C Germicidal + LED	Provides both visibility and active sterilization.

Air Control System Integration

Metrolabs Air Control Systems manage the broader atmospheric health of your facility, serving as the “brain” for your Cleanroom AHU and Distribution Plenums.

Pressure Gradient Management: Our controllers automatically adjust fan speeds to maintain the specific $10 \text{ Pa}$ to $15 \text{ Pa}$ pressure offsets required between rooms.
Energy-Efficient Logic: Our systems utilize VFD (Variable Frequency Drive) technology to reduce power consumption during “night mode” or low-occupancy periods while still maintaining sterility.
UV-C Sterilization Cycles: Integrated timers allow for automated UV-C surface disinfection within the pass box during idle periods, providing an extra layer of bio-safety.

The Metrolabs Advantage

At Metrolabs, we focus on long-term performance and “Zero-Ledge” engineering. Every pass box and control system is designed to be a seamless extension of our Modular Cleanroom Panels.

Flush Mounting: Our pass boxes are designed to be installed level with the wall surface, eliminating external dust-collecting ledges.
Silent Operation: Optimized internal aerodynamics ensure that the pass box operates with minimal noise and vibration, contributing to a stable laboratory environment.
Audit-Ready Documentation: Every unit is factory-validated for airflow velocity and filter integrity (PAO test), ensuring you are ready for ISO and GMP audits.

Technical Insight: For high-containment BSL-3 labs, we recommend our Dual-HEPA Dynamic Pass Boxes. These feature filtration on both the supply and exhaust paths, ensuring that no hazardous agents can escape the containment zone during material transfer.