Pandemic influenza

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Advice for workplaces on air conditioning and influenza

Influenza is primarily spread by large and small droplets, ie by close exposure to an infected person who is coughing and sneezing.

There is no current scientific evidence that influenza can be spread by air conditioning units. However, there is evidence that it can spread within a small enclosed space that does not have a functioning ventilation or air conditioning system.

There is scientific and medical evidence that other viral and bacterial infections, known to be capable of airborne spread, can spread through improperly designed, or inadequately maintained or serviced air conditioning systems.

The Ministry of Health and the Department of Labour recommend that all enclosed spaces are adequately ventilated to reduce the risk of droplet spread in enclosed spaces. If air-conditioning units are used to provide such ventilation, rather than open windows, then these units must be properly designed and maintained to the appropriate standards.

As part of their workplace health and safety monitoring, employers should gain assurance from the owner of any air conditioned building they occupy that air conditioning systems are maintained regularly and to the appropriate standard *."

* The appropriate standard may be found in the New Zealand Building Code, Clause G4, Ventilation.

Page last updated: 18 September 2007