ENGINEERING
The outer support room will be accessed first, and from here, operatives must pass through a first stage Grade D change area before entering the Grade D inner support room. They must then prepare for access to the Grade C ATMP isolator room in a Grade C change area before being able to enter. Each stage of travel through the ATMP areas is governed by interconnecting airlock doors, controlled on a traffic light system, which enables only one door to open at any given time, with a visual colour cue to indicate when the magnetic locking system can be opened.
An important element of the design process for the ATMP facilities was to understand the health and safety implications of working with materials that could be potentially hazardous if allowed to escape from the controlled isolator room environment. After considering the hospital’s risk assessment and proposed operating procedures, the BES team designed the airflow to minimise contamination risk, while ensuring that accidental spillages in the ATMP isolator room are contained. By maintaining highest negative pressure in the second stage change room, the design of the facility ensures that any spillage in the isolator room cannot escape to the inner support or first stage change areas, nor even to the outer support area. In this way, any spillage can be dealt with using a spill kit and bagging procedure, before cleaners come in to decontaminate the facilities.
The CT areas will be accessed from the opposite end of the same central corridor, with a similar route through the outer support room to a Grade D first change area into the Grade D inner support room.
A dedicated air-handling system has been installed to support the facility.
From here, operatives will enter the Grade C second change area before accessing the Grade C isolator room. These facilities will also be built with a traffic-light managed airlock system between each controlled environment. Pressure regimes will employ the same differentials as implemented in the new pharmacy.
Air-handling provision
The air handling provision will follow the model already constructed for the new pharmacy phase of the project, with full fresh air supply via the AHUs and a HEPA- filtered air extract, along with individual HEPA-filtered exhausts for each isolator. The BES team considered the COSHH assessment to determine whether local
exhaust ventilation (LEV) was required for the CT inner support room. Although LEV was not required for compliance, Nederman extraction has been specified in this location, to ensure the comfort and wellbeing of operatives using alcohol spraying equipment.
A clean and controlled environment As the project is being delivered in two phases, and there is a need for the hospital to retain a functioning pharmacy at all times, two air-handling units have been installed as part of the Phase 1 programme. BES has designed heat recovery into the air-handling system to reduce the heat energy required. The fresh air supply will serve both the
PRACTICAL CITY&GUILDS ACCREDITED COURSES
July 2021 Health Estate Journal 25
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