The cleanroom industry has embraced the tactic of including controls to allow the end user to manage the facility’s energy consumption. This includes set back hours for non-critical hours of operation to save energy, as well as adjusting the facility’s air changes per hour (ACH) for the times that they might go out of specifications.
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Some of the most common adjustments are made by tying in the facility’s fan filter units to be monitored and controlled by stand-alone control systems and, more commonly, the building management system (BMS). This is dependent upon the facility’s GMP and the critical environmental issues in the process.
USP 797, 798, and 800 call for these controls:
• interlocking doors
• lighting systems
• particle counters
• temperature sensors
• pressure sensors
• humidity sensors
• closed loop operation of the listed equipment
This cleanroom tip, which appeared in the July/August 2015 issue of Controlled Environments, is courtesy of Les Goldsmith of Envirco Corp. in Sanford, N.C. www.envirco-hvac.com