CLIENT: Spring Bank House, Mott MacDonald

Airtech supplied, installed and commissioned a Daikin 3-Pipe VRF Heating / Comfort Cooling System c/w Fresh Air Ventilation over 4 floors of Office space.

Air Conditioning

The open plan and cellular office areas for all floors were provided with comfort cooling and heating via a series of new air cooled variable refrigerant flow (VRF) fan coil units and external condensers. 

Each floor comprised one air cooled external condenser located on the existing 3rd floor plant deck situated at roof level. Each condenser was connected to a series of Daikin above ceiling ducted fan coil units via copper refrigeration pipe work.


Each fan coil unit was provided with a supply plenum. Fresh air was distributed throughout via installed air distribution ducts to a number of supply air swirl diffusers. All 3rd floor units were ducted back return.


Local control was provided in all areas, with a Daikin intelligent controller serving all four floors.

WC / Shower Extract Ventilation

Airtech also supplied WC / Shower Extract Ventilation over 4 floors.  All works were installed as per specification DW144. 

The system was single pipe, installed through an existing riser with branch ducts at each floor level with a fan installed in the roof top plant room.  Each WC / Shower area had a minimum extraction rate of 10 air changes per hour.  7-Day time clock control was included.