Terminal HEPA Filter Box (Ceiling Supply)
Precision-engineered cleanroom ceiling air terminal modules manufactured to house high-efficiency HEPA H14 / ULPA U15 filters. Provides uniform clean air delivery into cleanrooms with airtight mechanical knife-edge or fluid gel seals and built-in aerosol test ports.
Engineering Overview & Fluid Dynamics
Active contamination barrier and laminar downflow principles
The Himalayan Steel Terminal HEPA Filter Box is a critical cleanroom HVAC ceiling terminal designed to ensure 100% leak-free particulate filtration at the final point of air delivery. Fabricated from heavy-gauge stainless steel with continuous TIG welded seams, the housing features a precision knife-edge channel engineered for fluid gel-seal or closed-cell neoprene gasketed filters. Each box integrates a DOP / PAO aerosol challenge introduction port, an upstream aerosol concentration sampling nipple, and an integrated differential pressure measuring port, allowing comprehensive annual validation from inside the room without entering ceiling interstitial spaces.
Technical Engineering Specifications
Standard dimensional tolerances, electrical parameters, and air quality ratings
Standard Dimensional Matrix
Fabrication schedule comparison in Imperial and Metric standards
| Size (Feet) | Metric (MM) | Internal Chamber (W x D x H) | External Footprint (W x D x H) |
|---|---|---|---|
| 2 x 2 ft (Standard) | 610 x 610 x 350 mm | 610 x 610 x 150 mm | 670 x 670 x 350 mm |
| 2 x 3 ft | 610 x 915 x 350 mm | 610 x 915 x 150 mm | 670 x 975 x 350 mm |
| 2 x 4 ft (High Flow) | 610 x 1220 x 350 mm | 610 x 1220 x 150 mm | 670 x 1280 x 350 mm |
| 2.5 x 2.5 ft | 762 x 762 x 350 mm | 762 x 762 x 150 mm | 820 x 820 x 350 mm |
Cleanroom Construction & Architectural Design
cGMP sanitary fabrication details from our Baddi engineering works
Fabricated from 1.2 mm / 1.5 mm thick AISI 304 stainless steel with automated robotic TIG welded seams, pressure-tested to assure zero leakage between plenum and cleanroom.
Precision formed continuous knife-edge perimeter that embeds into the silicone/polyurethane fluid gel channel of the HEPA filter frame for 100% bypass-free sealing.
Perforated stainless distribution manifold introduces PAO / Emery 3004 challenge aerosol evenly across the entire filter face for accurate photometer scanning.
Internal balancing damper operated via a center-accessible adjustment screw behind the diffuser plate, avoiding ceiling crawl space entry during air balancing.
Architectural stainless steel diffuser with quarter-turn captive fasteners for fast removal during filter scanning and cleaning.
Four corner heavy-gauge M10 suspension brackets for direct leveling and anchoring to cleanroom structural ceiling grids.
Standard Operating Protocol (cGMP SOP)
Standard operating guidelines and contamination control sequence
Step-by-Step Material Transfer Sequence
Sanitization & Wipe-Down Protocol
- Wipe diffuser grilles weekly with lint-free wipes dampened in 70% filtered IPA.
- Avoid spraying cleaning chemical directly into the HEPA filter media.
Fail-Safe Interlock Protection
- Knife-edge gel seal prevents particulate bypass during HVAC fan pulsation cycles.
- Safety retention clips prevent filter from falling during maintenance unlatching.
Optional Engineering Customizations
Site-specific hardware adaptations
- Differential pressure transmitter with digital LED read-out on cleanroom wall
- Swirl induction diffuser plates for high-induction temperature mixing
- Manual or motorized airtight shut-off dampers
- Removable filter protection expanded stainless wire guard
- Epoxy painted cold rolled steel construction for non-corrosive general cleanrooms
- Side inlet duct entry collars for low ceiling height spaces
Quality Validation Package (DQ/IQ/OQ)
Audit-ready documentation for US FDA and EU-GMP inspections
- Design Qualification (DQ) CAD Drawing & Ceiling Opening Details
- Installation Qualification (IQ) Airtightness Pressure Decay Certificate
- Operational Qualification (OQ) Airflow Uniformity Certificate
- Material Test Certificate (EN 10204 3.1) for Stainless Steel
- Factory Leak Test Report (zero bypass at 1000 Pa)
- HEPA Filter Individual Scan & Efficiency Certificate
Cleanroom Design Highlights
- Continuous automated TIG welded casing verified for zero air leakage at 1000 Pa test pressure
- Room-side replaceable filter design enables filter changes without accessing dirty ceiling plenums
- Integral aerosol dispersion tube guarantees uniform challenge distribution for HEPA scan tests
- Butterfly or iris damper adjustment mechanism accessible through room-side faceplate
Target Pharmaceutical Applications
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