HHVAC Cleaning Compliance

HVAC Maintenance – What Are Your Obligations?

The responsibilities of a facility manager relating to the ongoing maintenance of a buildings’ HVAC system are clearly outlined in the applicable Australian standard – AS/NZ 3666.2:2011:

AS/NZS 3666.2:2011 outlines the when and what HVAC cleaning tasks to perform in order to assist in the control of microorganisms within buildings. The following table is an indicative list of these tasks:
Outdoor air intakes and exhaustsMonthlyWhen Necessary
Air filtersMonthlyWhen Necessary
HumidifiersMonthlyWhen Necessary
Evaporative air-cooling equipment3 MonthsWhen Necessary
Sump3 MonthsWhen Necessary
Wetted pads3 MonthsWhen Necessary
Water strainer3 MonthsWhen Necessary
Air filter3 MonthsWhen Necessary
Drainage system3 MonthsWhen Necessary
Ducts and components
CoilsMonthlyWhen Necessary
Trays and sumpsMonthlyWhen Necessary
Condensate drains, tundishes, and trapsMonthlyWhen Necessary
DuctworkAnnuallyWhen Necessary
Fans3 MonthsWhen Necessary
Terminal units inc. coilsAnnuallyWhen Necessary
Terminal units components including coilsAnnuallyWhen Necessary
Return air and relief air grillesAnnuallyWhen Necessary
AS/NZS 3666.2:2011 & HVAC Cleaning

The title of this standard is “Air-handling and water systems of buildings – Microbial control Part 2: Operation & maintenance“. As the title indicates, it’s critical that HVAC systems and air-handling systems are maintained in order to control microorganisms accumulating in building air systems.

As can be seen above, the standard explicitly mentions the following 5 parts of an HVAC system that must be part of a maintenance program:


Frequency  – Monthly

Inspect, clean or replace where necessary.


Frequency  – Monthly

Inspect, clean or replace where necessary.


Frequency  – Monthly

Inspect, clean or replace where necessary.


Frequency  – At least every 3 Months

Inspect, clean or replace where necessary.


Frequency  – Depending on component between 1 Month & 12 months

Inspect, clean or replace where necessary.

Components include:

  • Coils
  • Trays & Sumps
  • Condensate drains, tundishes & traps
  • Ductwork
  • Fans
  • Terminal Units
  • Supply air outlets
  • Return air & relief air grilles

The standard also outlines the need for the existence of Maintenance Manuals and Maintenance Records.

The Maintenance Manual should include details of the maintenance management program including plant servicing, cleaning schedules, and replacement periods for equipment items and components.

Maintenance Records should include:

  1. Date and nature of service performed.
  2. Results of periodic testing.
  3. Details of defects found and remedial procedure undertaken.
  4. The name of the person and company performing the service.

Maintenance manuals and Maintenance Service Records shall be readily available at the site for inspection by regulatory authority upon request.

For the purpose of maintenance management, the maintenance service records shall be retained for a period as required by the regulatory authority.

Clean Air Filtration Services can manage all your HVAC maintenance requirements. We can maintain Maintenance records and ensure that your building, hospital or factory is compliant.