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CLEANROOM DESIGN


While the BES team did not have the calculations data for the air flow rates in the two Non-toxic Sterile Compounding facilities, the schematic drawings showed that the flow rates were not sufficient to maintain the required air change rates. To achieve the additional flowrate, BES redesigned the configuration of the HVAC air distribution system and re-specified the air-handling equipment to increase the air flow capacity. This meant that both of the suites had to be stripped back to enable the old equipment to be removed, adding additional time and cost to the project with the replacement of finishes once the new equipment had been retrofitted to the build.


Air distribution issue


There was also an air distribution issue in some of the main cleanrooms of the Sterile suites, which would have prevented these areas from achieving their required cleanliness levels. The original ventilation design involved a central air distribution arrangement, which resulted in uneven distribution of clean air, with pockets of the room outside of the diffusion area of the canopy receiving an insufficient quantity of clean air. To rectify this, the BES design replaced the central air distribution point with a larger number of diffusion points, and introduced swirl diffusers to aid more effective distribution


The pharmacy workstation in the Toxic Compounding facility.


across the space. The swirl air diffusion design distributes the clean air in a helical pattern, ensuring that the clean air supply mixes effectively with the air in the room.


Additional issues


The wide-ranging changes required in the mechanical specification of all three specialist environments prompted a need for wider specification upgrades on the Middle Eastern hospital project. For


example, the need for increased cooling in the Toxic Compounding facility meant that an increased chilled water supply was required from the centralised plant to service the larger coil, which, in turn, demanded an increase in chiller capacity to chill the water. This not only represented a high cost to the hospital, but also created challenges with space availability in the rooftop plant area. The control system was also affected because of changes to the HVAC strategy


October 2018 Health Estate Journal 65


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