Field Service EngineerHertfordshire £45,000 £55,000 + company vehicle + bonus + overtime + benefits Aspion Search is partnering with a specialist engineering group delivering high-spec projects across hospitals, laboratories and cleanroom environments. They are seeking a Field Service Engineer to validate and test critical ventilation and cleanroom systems to HTM 03-01, ISO 14644 and GMP standards. The Business: A respected and expanding provider of commissioning, validation, and compliance services across the UK, supporting the NHS, pharmaceutical, and manufacturing sectors.Offers structured training, clear career progression, and ongoing professional development.A forward-thinking, collaborative team where your work directly impacts patient safety, product quality, and clean air compliance. The Role of the Field Service Engineer:Field-based UK role (travel and accommodation fully supported) using state-of-the-art, calibrated equipment to validate critical ventilation systems. HEPA/ULPA filter integrity testing (DOP/PAO testing)Airflow measurement for supply and extract systemsCalculation of air change ratesVelocity measurements within isolators and laminar airflow (LAF) cabinetsMonitoring and recording of pressure differentialsAirborne particle counting and analysisAirborne microbial contamination monitoringSurface sampling for microbial contaminationCarries out validation of: Operating theatres Microbiological safety cabinets (Class I III)Cleanroom ..... full job details .....