CLEANROOM VENTILATION R-454B ALL-IN-ONE SOLUTION 100,000 10,000 Particles/m3 @ 0.5m VECTIOS POWER | COMMERCIAL OFFICES 1,000 100 10 0 0 20 40 60 80 100 120 140 160 180 Time elapsed (mins) Mobile ltration Fixed installation Figure 3: Clean-up rate comparison of mobile ltration unit and xed installation at 0.5 m particle range trapping particulates and managing energy consumption on a matched to demand basis, using CO2 monitors, provides an acceptable trade-off between energy use and air quality. Outputs from the work can inform a number of design parameters that go beyond those discussed in this article see panel Design considerations (below). One consequence of this research is real-time monitoring of particles in the cleanroom sector. Currently, HEPA filters may be checked once every six to 12 months, but real-time monitoring using a particle counter will allow operators to see when filters need changing. CIBSEs call to action to effectively meet, and evidence, the needs of air cleaning not only led us to understand the efficacy of diffuse air systems in commercial settings, but also enabled knowledge transfer back to the cleanroom sector, which will potentially save time and money in the maintenance of life science laboratories. CJ ErP READY 2021 ENVIRONMENTAL SUSTAINABILITY ENERGY SAVINGS EXTENSIVE SCOPE References: 1 CIBSE Covid-19 Ventilation Guidance, v5 (July 2021) BRENDON MCMANUS MCIBSE is CEO, RICHARD FAGG is lead designer and STEVE ROBINSON is senior technical engineer, all at Clean Air Technologies DESIGN CONSIDERATIONS PACKAGED SYSTEM HIGHLY RELIABLE marketing.uk.ciat@carrier.com www.ciat.uk.com 01372 220 151 Employ inline or terminal HEPA lters Utilise suitably sized and specied air-diffusion technology to drive air towards low-level return paths Apply top-down airow to minimise disruption from base-build ventilation systems instead of reliance on convection/plumes to transport contaminants Maintain sufcient velocity and air turbulence throughout the room to keep particulates buoyant and ensure their capture by HEPA lters Correctly position high-level air diffusers for consistent sweeping of the space Actively monitor occupancy and CO2 levels; ensure the ventilation rates are scaled to risk, reducing energy consumption Undertake downstream monitoring of airborne particulate levels, lter condition and ventilation rates for real-time reassurance that the system is protecting room users Consider other important comfort factors, such as attenuation of noise levels from fan/air Provide visual indications of system efcacy, reporting positive airow and downstream particulate counts Colour code the air diffusers 44 June 2022 www.cibsejournal.com CIBSE June 22 pp40-42, 44 Cleanroom ventilation.indd 44 27/05/2022 16:34