HJ 051I Series High-Efficiency Supply Air Terminal Unit

Overview

The HJ 051I Series High-Efficiency Supply Air Terminal Unit is an engineered terminal filtration solution designed for controlled environment HVAC systems operating at ISO Class 6 (1,000), ISO Class 7 (10,000), and ISO Class 8 (100,000)洁净度 levels. It functions as the final stage of air purification in cleanroom ventilation networks—integrated downstream of pre-filters and medium-efficiency filters—to ensure delivery of particle-free air directly into the critical workspace. Based on the principle of mechanical depth filtration using pleated HEPA media (EN 1822-compliant), the unit achieves ≥99.99% particle capture efficiency for ≥0.3 µm aerosols (H13 grade) and ≥99.995% (H14 grade), meeting stringent requirements for pharmaceutical aseptic processing, biotech cell culture environments, medical device assembly, and semiconductor manufacturing support zones. Its modular design supports both retrofit installations in legacy cleanrooms and integration into new-build HVAC infrastructure.

Key Features

• Bottom-access HEPA filter replacement—minimizes contamination risk during maintenance and eliminates need for ceiling access tools or scaffolding.
• Rigid cold-rolled steel housing with electrostatically applied epoxy-polyester coating ensures structural integrity, corrosion resistance, and compliance with cleanroom-compatible surface finish standards (Ra ≤ 0.8 µm).
• Dual inlet configuration: standardized top-mounted or side-mounted square flanges (200 × 200 mm), compatible with common ductwork systems; optional round flange variants available upon request.
• Integrated diffuser plate with aerodynamically optimized perforation pattern ensures uniform velocity distribution (CV ≤ 15%) across the supply plane—critical for maintaining laminar or non-uniform airflow profiles per ISO 14644-3.
• Sealing architecture supports multiple gasketing options: standard EPDM compression gasket for rigid-frame installation, or liquid-seal (gel-seal) configuration for ultra-low leakage applications requiring ≤0.01% bypass (per IEST-RP-CC001.4).
• Optional thermal insulation layer (glass wool or closed-cell elastomeric foam) mitigates condensation risk in high-humidity or low-dew-point environments.
• Stainless steel housing variant (AISI 304) available for ISO Class 5+ cleanrooms where non-shedding, non-corrosive materials are mandated under EU GMP Annex 1 or USP .

Sample Compatibility & Compliance

The HJ 051I is validated for continuous operation in Class A/B/C/D cleanroom environments per EU GMP Annex 1 (2022), FDA Guidance for Industry: Sterile Drug Products Produced by Aseptic Processing (2004), and ISO 14644-1:2015. It is suitable for use with sterile-grade compressed air, nitrogen purged systems, and recirculated air loops where microbial control and particulate retention are critical. The unit complies with EN 1822-1:2019 for HEPA filter classification, EN 13034 for protective clothing compatibility (non-shedding surfaces), and GB/T 13554–2020 (Chinese national standard for high-efficiency air filters). All units undergo individual DOP/PAO leak testing at factory (scan test per ISO 14644-3 Annex B3), with full test reports traceable to NIST-certified photometers.

Software & Data Management

While the HJ 051I is a passive mechanical device without embedded electronics, its integration into modern cleanroom monitoring ecosystems is fully supported. Each unit is supplied with a unique serial number and calibration dossier—including initial resistance measurement, filter integrity test report, and dimensional verification data—for inclusion in facility master validation files. When paired with third-party Building Management Systems (BMS) or Environmental Monitoring Systems (EMS), differential pressure sensors (e.g., Setra 265 or Validyne DP103) can be mounted upstream/downstream to log real-time ΔP trends for predictive filter change scheduling. Documentation packages meet FDA 21 CFR Part 11 requirements when stored within validated electronic quality management systems (eQMS), supporting audit readiness for GLP, GMP, and ISO 9001 assessments.

Applications

• Aseptic filling suites (vial, syringe, cartridge lines) requiring ISO Class 5 background protection.
• Cell therapy and monoclonal antibody production cleanrooms (ISO Class 7 main areas with ISO Class 5 workstations).
• Medical device packaging rooms compliant with ISO 13485:2016.
• Microelectronics photolithography support zones where sub-micron airborne molecular contamination (AMC) precursors must be minimized.
• Research laboratories conducting nanoparticle synthesis or CRISPR-based genome editing under containment protocols.
• Pharmaceutical R&D labs validating formulation stability under controlled environmental conditions (ICH Q1A–Q5E).

FAQ

What filter classes are supported by the HJ 051I series?
The unit accommodates H13 (≥99.99% @ 0.3 µm), H14 (≥99.995% @ 0.3 µm), and liquid-seal H14 configurations per EN 1822-1:2019.
Is field balancing required after installation?
Yes—per ISO 14644-3, each unit must be commissioned with anemometer-based airflow verification; resistance matching across a bank must remain within ±5% of mean value for unidirectional flow applications.
Can the unit be installed in a gypsum board ceiling?
Yes, provided structural reinforcement is implemented per ASTM C1396 and sealing is performed using UL-listed silicone gasketing material compatible with cleanroom-grade adhesives.
Does the unit include a pressure tap for differential pressure monitoring?
No—pressure taps are optional accessories; however, the housing includes pre-drilled and threaded ports (M5) at upstream and downstream locations for easy sensor integration.
What is the recommended service interval for filter replacement?
Filter life depends on upstream air quality and usage intensity; typical replacement occurs every 12–24 months, triggered by ΔP exceeding 2× initial resistance or failing post-installation PAO scan test.