Ambulatory Diagnostic Centre transitions to fully electric air handling in decarbonisation push

Published: 19-Nov-2025

Energy-efficient ventilation expert Mansfield Pollard has completed the design, manufacture and delivery of six fully electric air handling units at West Middlesex University Hospital

Mansfield Pollard has completed the design, manufacture and delivery of six high-efficiency, fully electric air handling units for the new £80m Ambulatory Diagnostic Centre at West Middlesex University Hospital. 

“By transitioning to fully electric systems and tailoring each unit to specific clinical needs, we’ve helped future-proof the hospital’s infrastructure while supporting national net zero goals,” said Lou Ellis-Frankland, CEO of Mansfield Pollard.

The project, delivered by Bouygues UK, is a flagship element of Chelsea and Westminster Hospital NHS Foundation Trust's modernisation programme and the national net zero strategy.

Each AHU was designed and manufactured to meet the specific environmental and clinical requirements of its destination department, including imaging, oncology, dialysis and education spaces.

Each unit connects directly to the hospital’s building management system through a factory-fitted controls package

The systems deliver precise control over temperature, filtration, air quality and pressure across each critical zone. 

They were also built with electric heater batteries in place of traditional gas-fired coils to align with the NHS’s decarbonisation agenda. 

Each unit connects directly to the hospital’s building management system through a factory-fitted controls package, allowing real-time monitoring and automatic adjustments to maintain the right conditions across different departments. 

AHUs use advanced components such as EC fan arrays, DX heat pump coils and counterflow heat exchangers that recover warmth from outgoing air. 

The units are built to high standards for air tightness and insulation.

The Ambulatory Diagnostic Centre’s creation will increase diagnostic capacity by 43%, supporting an additional 67,000 imaging procedures annually and doubling chemotherapy and dialysis capacity.

The move to install fully electric air handling units aligns with the NHS’s environmental targets to cut emissions by 80% by 2028-32 and reach net zero by 2040. 

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