Twin HTM 03-01 Units with Central Maintenance Corridor

Sector – Air Handling Units

A specialist ventilation solution for The Shrodells Unit: A £4.1 million office conversion to clinical ward space at Watford General Infirmary

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The Project

Works were recently completed on a £4.1 million project for West Hertfordshire Teaching Hospital NHS Trust to convert existing office accommodation into additional clinical ward space. The project: ‘Shrodells Building’, comprised a complete architectural fit out of the existing building at Watford General Hospital, with full mechanical and electrical services installation including new air handling plant to HTM specifications.

As air management experts, Mansfield Pollard were engaged by Principal Contractor Briggs & Forrester Special Projects Team to manufacture and install a unique air handling solution to serve the new clinical facility

Project Highlights


Both HTM 03-01 AHU’s were manufactured using specialist thermal-break aluminium profile, to achieve TB2(M). This not only improves energy efficiency, but also minimises the risk of any condensation forming internally or externally, protecting the units from both corrosion and micro-organism growth. Hygiene levels were further improved via stainless steel internal paneling, specialist coils & oversized drain trays to remove any condensate.

Energy Efficient

A twin E.C. fan section improved reliability with an 80% redundancy level and unit manufacture to D2 casing strength and L2 thermal transmittance levels maximised energy efficiency of the unit.

Customised Maintenance Corridor

A tailor-made central maintenance corridor was designed and manufactured to run along the length of the AHU’s. Fully seam welded with an double pitched roof, the corridor provides protection from the elements and access to both units. To accommodate DX pipework, the corridor was designed with a 150mm void in the roof space and also incorporated a lift up floor inspection panel and sumps to contain drainage traps.


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