A well-established UK contractor specialising in high-specification controlled environments is seeking a mid-level HVAC Design Engineer to strengthen its in-house design capability. The business delivers technically demanding cleanroom and critical ventilation projects across life sciences, healthcare and advanced manufacturing sectors.This is a performance-led design role focused on precision airflow, environmental stability and compliance-driven engineering. This role would suit a technically capable mid-level engineer currently operating as a Mechanical Design Engineer, Building Services Design Engineer, HVAC Design Engineer, Cleanroom Design Engineer, Ventilation Design Engineer or Environmental Control Engineer looking to step into a more specialist, performance-led environment.You will take responsibility for the mechanical design of HVAC and ventilation systems within controlled and cleanroom environments, translating performance briefs into engineered solutions.Duties will include:Heat loss, heat gain and cooling load calculationsPsychrometric analysis and humidity control strategiesAirflow modelling and air change rate calculationsDesign of pressure cascades and contamination control strategiesSpecification of AHUs, HEPA filtration systems, ductwork and associated plantProduction of ventilation schematics and technical design documentationTechnical liaison with Project Managers and site teams through installationProviding technical support during commissioning and ..... full job details .....