Electric Lift Pass Box

It employs a HEPA filtered airflow system where a built-in fan recirculates air vertically or horizontally through filters, maintaining ISO Class 5 cleanliness inside the chamber. When the lift activates, purified air enters the compartment to dilute particles from transferred items and returns via a grille—creating a continuous clean-air cycle. Dual-stage filtration (pre-filter + H13/H14 HEPA) removes both large and fine contaminants. Differential pressure monitoring ensures filter performance, while the air velocity is typically maintained. These continuous airflow dynamics keep the internal chamber sterile during the lifting process.

The unit features electronic or electromagnetic interlock mechanisms that strictly prevent both doors from being opened simultaneously, effectively stopping cross-contamination. Fan operation locks the doors, and opening a door usually triggers an automatic UV shut-off and LED-visual indicators. In addition, digital or analog differential pressure gauges with alarm thresholds alert when pressure deviates, signalling filter clogging or malfunction. Audio-visual alarms can also be set to notify operators of extended door openings or blower issues, ensuring compliance with ISO/GMP protocols.

Regular maintenance includes replacing the pre-filter every 1 to 6 months and the HEPA filter every 6 to12 months, depending on usage and particle load. After filter replacement, integrity tests using particle counters or DOP/PAO ports ensure there’s no leakage. Periodic airflow visualization (e.g., smoke test) confirms unidirectional flow. Daily or monthly differential pressure checks validate proper ventilation performance. UV-C lamps and internal chamber surfaces are cleaned weekly using approved disinfectants. Power components should be handled cautiously, with non-professional personnel restricted from circuit board access.

Yes—dynamic pass boxes are engineered to support transfers between various ISO-grade environments (e.g., non-clean to ISO 5 or C to B), acting as airtight airlocks. Some models are available in explosion-proof/ATEX-rated variants for use with combustible or hazardous materials. The airflow system is designed with variable-frequency drives to maintain consistent differential pressure, even if both doors are opened briefly. Configuration options include single-, double-, L-shaped, or multi-sided designs tailored for compartment-specific layout. Accessories like UV-C disinfection, intercom systems, and touchscreen panels increase flexibility across pharmaceutical, biotech, and industrial applications.

Equipped with differential pressure gauges (analog /digital), the pass box continually monitors HEPA filter loading and airflow performance—providing data for maintenance logs. DOP/PAO test ports allow onsite filter integrity testing, essential for GMP validation. Door completion timers and UV-hour meters track usage cycles and UV exposure durations, enabling routine documentation. Control systems often include password-protected or touchscreen interfaces for secure adjustments. Together, these systems support full lifecycle documentation—DQ/IQ/OQ/PQ protocols—and help satisfy audit requirements under ISO 14644, IEST, US cGMP, and WHO guidelines.