Clean Room Engineering & Semiconductor Facility Consulting

ISO 14644 Classification Consulting

Clean room classification is the foundation of environmental control strategy. We conduct detailed assessment of your process requirements—particle size sensitivity, airborne molecular contamination (AMC) limits, biological contamination risk—and recommend the appropriate ISO 14644 class (1 through 8). Semiconductor fabrication typically demands ISO Class 1–3 (particle count <1,000 to <100,000 particles per m³ at ≥0.5µm). Pharmaceutical manufacturing under EU GMP Annex 1 requires ISO Class 5 (Grade A), 6 (Grade B), 7 (Grade C), or 8 (Grade D) depending on the operation. We model airflow patterns, perform particle balance calculations, and validate that your facility design achieves the target classification cost-effectively.

HVAC System Design for Contamination Control

HVAC is the cornerstone of clean room performance. We design systems that deliver filtered air at precise flow rates whilst maintaining pressure cascading across zones. Our designs incorporate HEPA filtration (H13/H14) and ULPA filtration (U15/U16) for ultra-clean environments, with redundancy for mission-critical processes. We model laminar flow (ideal for semiconductor and pharmaceutical operations) and turbulent mixing (suitable for general manufacturing) based on process geometry and contamination sensitivity. Ductwork is designed to minimise bypass routes and particulate settling. Supply and exhaust are balanced to maintain positive pressure in clean areas and prevent ingress from adjacent lower-class zones. Thermal and humidity control is integrated into the design—clean rooms often require ±1°C temperature control and ±2% RH humidity control, which demands precision-tuned HVAC and tight building envelope performance.

Environmental Parameter Engineering

Beyond particle control, semiconductor and pharmaceutical processes demand exacting environmental parameters. Temperature stability (±0.1°C in some precision applications), humidity control (±1% RH), and vibration isolation (ISO VC-D to VC-E for most semiconductor processes) are critical to product yield and quality. We conduct thermal modelling to identify hot spots and ensure cooling system uniformity. We design humidity control systems with humidification and dehumidification capacity to respond to occupancy loads, process heat generation, and seasonal variation. For vibration-sensitive equipment (electron beam lithography, precision metrology), we design isolated mechanical systems and structural damping to meet ISO 20816 vibration standards. Electrostatic discharge (ESD) risk is managed through conductive flooring, dissipative wall coatings, bonding strategies, and staffing protocols—all informed by IEC 61340 ESD standards.

Airborne Molecular Contamination (AMC) Control

Semiconductor processing is sensitive to chemical contamination. Acids, bases, siloxanes, and organic compounds at parts-per-billion levels can cause defects. We design AMC filtration systems incorporating activated carbon, potassium iodide (KI), and specialty sorbents to remove target contaminants. Source control is equally important: process equipment is isolated in dedicated enclosures with local exhaust systems, process gases are ultra-pure grade (5.0 or higher), and chemical storage areas are segregated from clean zones with dedicated ventilation. We specify gas-phase filtration efficiency (e.g., 99.95% removal of formaldehyde) and provide monitoring protocols using real-time AMC analysers or passive badge sampling.

MEP Integration for Clean Room Facilities

Clean rooms demand sophisticated process utility infrastructure. Ultra-pure water (UPW) systems with resistivity >18 MΩ/cm and total organic carbon (TOC) <5 ppb are essential for semiconductor and electronics manufacturing. We design multi-stage purification (deionisation, reverse osmosis, ultra-violet (UV) oxidation, polishing) with recirculation loops maintained at >65°C to prevent bacterial growth. Compressed dry air (CDA) systems are designed with oil-removal, moisture control (dew point -40°C or lower), and particle filtration to ISO Class 2 (<100 particles/m³). Specialty gases—nitrogen, argon, hydrogen, oxygen—require purity and pressure control with dedicated distribution networks, pressure regulators, and safety relief. Process cooling often demands high-specification chilled water or glycol loops with temperature control ±0.5°C. Waste gas treatment systems neutralise acidic vapours (HCl, HF, H₂SO₄), basic vapours (NH₃), and combustible streams with scrubbers, oxidation reactors, or adsorption systems compliant with environmental regulations.

Power Infrastructure for Fabs

Semiconductor fabrication equipment demands uninterrupted, high-quality power. We design dual-feed high-voltage supplies with automatic transfer switches (ATS) capable of <4 ms switchover. All production equipment is supported by uninterruptible power supplies (UPS)—typically with 5–15 minutes runtime to allow controlled shutdown or continued operation during brief outages. Power distribution is designed with electrical discrimination to prevent cascading failures—selective tripping of circuit breakers ensures that equipment failures don't cascade blackouts across the facility. Harmonic distortion is strictly controlled (THD <5%) to prevent semiconductor equipment malfunction and transformer overheating. Grounding and equipotential bonding are engineered to mitigate ESD risk and ensure safe operation of sensitive equipment. We conduct short-circuit analysis and arc flash assessments to ensure safety compliance with BS 7671:2018+A2:2022 and EU standards.

Commissioning & Qualification (IQ/OQ/PQ)

Clean rooms must be formally qualified before production begins. We develop comprehensive commissioning and qualification protocols aligned to EU GMP Annex 1 (pharmaceutical), SEMI standards (semiconductor), and industry best practice. Installation Qualification (IQ) verifies that equipment is installed per design specifications, with documentation of serial numbers, calibration certificates, and installation drawings. Operational Qualification (OQ) tests equipment function under design conditions—airflow measurement (anemometry), particle count testing (laser particle counters), temperature and humidity logging, pressure cascade verification, vibration analysis. Performance Qualification (PQ) validates that the clean room sustains design performance under simulated or actual process loads. We specify witness testing protocols, acceptance criteria, and remediation procedures for any non-conformances. Final commissioning records become part of the as-built documentation and serve as the baseline for future audits.

Energy Optimisation for Clean Rooms

Clean rooms consume 5–10 times more energy per square metre than conventional facilities due to continuous filtration, precise climate control, and air handling load. Energy optimisation is critical for economic viability and regulatory compliance (UK ESOS, EU Energy Efficiency Directive 2023/1791, EU Taxonomy sustainable investment criteria). We conduct energy modelling using industry tools (IDA ICE, EnergyPlus, Hevacomp) to identify efficiency opportunities: variable air volume (VAV) systems that reduce fan power during partial occupancy, heat recovery (plate-frame or rotary exchangers) to capture waste heat, demand-controlled ventilation triggered by occupancy or process state, and optimised equipment sequencing. We design systems that balance precise environmental control with minimum energy consumption, and we provide energy performance baselines and monitoring protocols to track operational efficiency against design assumptions.