Ventilation and Air Purification

Maintenance and cleaning of air purifiers

Continued use of air purifiers and the maintenance and cleaning of air purifiers is a key part of keeping schools safe and is part of the regular maintenance of school assets. Schools can complete their air purifier maintenance as part of their quarterly general workplace safety inspection checklist. It is recommended that schools include air purifier maintenance and cleaning in their School Maintenance Plan.

Schools are responsible for the general maintenance and cleaning of their air purifiers. Contract cleaners will not clean the device.

There are 3 elements of the purifier that require cleaning and/or replacement:

• surface
• pre-filters
• HEPA filters.

Maintenance or cleaning should be undertaken in a well-ventilated space. Single-use surgical masks and gloves are recommended to be worn when cleaning pre-filters or replacing HEPA filters, for general hygiene purposes. Hand hygiene should be performed after cleaning and maintenance.

No action is required to the cleaning of the pre-filter or replacement of the HEPA filter if confirmed infectious disease cases have been in the room where an air purifier has been running.

Air purifiers require testing and tagging as per the guidance on PAL. Refer to the Testing and Tagging of Electrical Equipment policy.

Surface cleaning

Schools should clean the surface of the device regularly in line with the manufacturer’s guidance. Contractor cleaners will treat the air purifiers in a similar way to other electrical items, which normally includes dusting.

Cleaning the pre-filters

Each air purifier has 2 pre-filters which are visible once the front cover of the device is unclipped.

The pre-filters are to be cleaned every 5 to 6 weeks when the purifier is being used every weekday (or twice per term). For example, this could be done mid-term and towards the end of term. This is based on the expected use in a school setting. It is different to the recommendation of every 2 weeks in the manufacturer’s manual, which is based on 24/7 use.

Removing the pre-filter does not require tools. The pre-filters clip into the device in front of the HEPA filter. For further information on how to remove the pre-filter for cleaning, please refer to the user manual.

There are 3 ways to clean a pre-filter:

1. Pre-filters can be cleaned with a duster or soft brush to remove dust. This is recommended to be undertaken outside.
2. Pre-filters can be vacuumed to remove dust. This can be done within the immediate vicinity of the air purifier unit. It is preferable to use a vacuum cleaner equipped with a HEPA filter.
3. Pre-filters can be washed with water. It is important that pre-filters are completely dry before being re-inserted into the air purifier. To speed up drying time, it is recommended that filters are initially manually dried with an absorbent cloth (such as a microfibre cloth) and left to air dry, away from direct sunlight, before being reinstalled into the device.

Schools can arrange this work at their discretion. Schools may also consider using the following:

• the current HVAC contractor that cleans and maintains the school’s air-conditioning filters
• the school maintenance person.

Schools may order additional cleaning with their current cleaning services provider. For more information on funding arrangements please see below.

Replacing the HEPA filter

Each air purifier has 2 HEPA filters which are visible once the front cover of the device is unclipped.

Six replacement HEPA filters per air purifier have been provided to schools. This is expected to cover replacements for approximately 2 years based on the estimated replacement every 6 to 12 months. This will depend on the use case and operating environment of each device.

Replacement of the HEPA filter should occur when the device alerts. Replace both HEPA filters at this time.

No tools are required to replace HEPA filters. They clip into the device behind the pre-filter, which must be removed before replacing the HEPA filter.

Place used HEPA filters in a sealed bag and dispose of in general waste. Used HEPA filters are not recyclable

For further information on how to replace the HEPA filter, please refer to the user manual.

Where possible, HEPA filters should be stored in the proper vertical position, as marked on the container. For ease of replacement, it is recommended that replacement filters are stored near their associated air purifier unit.