Where are HEPA filters used?

They are used in a variety of industries to filter airborne contaminants out of the air. They are used in medical, hospitals, vacuum cleaners, aircraft, homes and commercial properties. Hepa stands for high-efficiency particulate absorber meaning they need to remove 99.7% of particles that have a size equal to or greater than 3 microns.

They are also useful for air filtration in the following applications:

  • Mould Spores
  • Asbestos
  • Odour removal (when used with carbon filter) - Smoke odour, crime scenes, VOC
  • Hospital and Medical facilities for preventing cross-contamination
  • Silica dust filtration - on construction sites. To prevent workers risk of silicosis
  • Cleanroom filtration - for Laboratories and manufacturing facilities

How long should you run an air scrubber?

This depends on the application, the size of the room and the contamination of the environment. Generally, a Hepa Air Scrubber will need to be run in the environment to ensure all contamination has been removed from the ambient air.

In the case of mould contamination, you will need to remediate the active mould growth in the property, otherwise, the active mould growth will continue to produce mould spores released into the air. Once the live mould growth has been dealt with, you will need to run the air scrubbers in the environment with the correct amount of air exchanges until all contamination has been removed from the air.

You can monitor the effectiveness of the air scrubber by using a dust monitoring device. To ensure the contaminant levels are consistently decreasing until it has reached the desired level. There are several low-cost units available on the market, we also offer some available for hire as well.

Additionally, you can also work out the number of air exchanges the unit can do an hour. This will help you determine how often the air in the environment is effectively scrubbed of contaminants, generally, the air has to be passed through the filter several times before it is scrubbed effectively.

How much electricity does an air purifier use?

Our smaller units 500 CFM only use approximately 1.5 amps of power (230v). Our medium-sized unit uses approximately 5 Amps. The 2000 uses approximately 8 amps and our extra-large industrial uses 2 x 15 amp but can be wound down to 8 amps single phase if there are no 15 amp circuits available.

Electricity usage is calculated based on calculating the kilowatt usage per hour then asking your electricity carrier what the cost per kilowatt-hour is. Wattage can be determined off amps using a calculator (there are many available online).

How long do air scrubbers last?

Our commercial-grade air scrubbers are made from quality components assembled in the USA. Our units are tested and cleaned regularly. Therefore, our units will last for several years, if not decades.


The filters inside the air scrubbers have a limited useful life. There are generally 2 filters inside the units. There is a primary filter - which is your main HEPA filter and there is a pre-filter that is designed to. The pre-filter needs to be changed regularly to ensure it is protecting the primary HEPA filter (which is expensive). The frequency of the pre-filter change is determined based on the application. For instance, many of our air scrubbers are used on mould jobs would generally be replaced several times while the job is being complete.


It is replaced after the initial strip is out of the premises, it may be replaced during the remediation to remove mould spores then replaced again to do a final scrub of the property That is 3 times a week. This will help ensure the primary filter is being protected.

How often does the primary filter need to be replaced?

We replaced these when they are needed. Each of our HEPA air scrubbers has a pressure flow sensor placed inside connected to a filter replacement light. This can determine when the primary filter needs to be replaced.

However, since most of our HEPA filters are used on high-grade hospital jobs, we want to ensure our units are 100 % effective. So we test each unit monthly by placing a dust monitor in front of the outflow of the unit to see whether there are any contaminants that are leaking past the HEPA primary filter. We have found after conducting this, that many of our HEPA primary filters can last anywhere from 6-12 months with regular use. One interesting point to note is that HEPA filters become more efficient the more they get used, this is until they are completely full at which point they should be disposed of.

What Air Scrubbers won’t do

Air scrubbers main limitation is that it is only effective against airborne particles. They are not effective at cleaning the source or the surfaces. It will not clean the surfaces of an HVAC system that is beyond its reach. Using an air scrubber is no guarantee that all air will be decontaminated when the job is complete. There are a lot of dead spaces where air cannot be accessed such as walls and cavities. The air in these spaces will never pass through the air scrubber.