AS/NZS 3666.4:2011 PDF
Outlines a performance-based approach to the maintenance of ducts and components forming air-handling systems with respect to the control of microorganisms, within such systems.
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Air-handling and water systems of buildings – Microbial control, Part 4: Performance-based maintenance of air-handling systems (ducts and components)
standard by Standards Australia / Standards New Zealand , 11/14/2011