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What Are Air Scrubbers and How Do They Work?

Last updated October 31, 2026

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The short answer

The Role of Air Scrubbers in Restoration

Air scrubbers are essential tools used by water damage pros after a leak or flood. They help control airborne contaminants stirred up during the drying and cleanup process. This includes particles like drywall dust, mold spores, and general debris. By cleaning the air, these units create a safer environment for both the occupants and the workers performing the restoration.

Using an air scrubber is a standard step in professional water damage protocols. It is not a substitute for removing wet materials or addressing the source of moisture. Instead, it works alongside dehumidifiers and air movers as part of a complete drying system. The goal is to protect your home's air while the underlying damage is being repaired.

How Air Scrubbers Clean Your Indoor Air

The cleaning process starts when the unit's fan pulls room air into the machine. The air first passes through a pre-filter that catches larger particles like hair and lint. It then moves through a much finer primary filter, often a High-Efficiency Particulate Air (HEPA) filter, which captures microscopic contaminants. Finally, the cleaned air is circulated back into the room, completing the cycle.

This continuous filtration significantly reduces the particle count in the air. For the most effective cleaning, the pros will strategically place one or more units in the affected area. They run the machines for the duration of the drying project, which may be several days. Proper placement and operation are key to achieving clean, healthy air in your home.

Key Components Inside an Air Scrubber

Understanding the main parts of an air scrubber shows how it achieves results. The core component is the fan or blower, which provides the airflow necessary to pull contaminants into the unit. The filter set is the workhorse, with multiple stages designed to capture particles of different sizes. The housing holds everything together and often includes wheels for easy portability around your home.

  • Fan/Blower: Creates airflow to pull contaminated air into the machine.
  • Pre-Filter: Captures large debris like dust and pet hair to protect the main filter.
  • HEPA Filter: The primary filter that traps microscopic particles, including mold spores.
  • Carbon Filter: An optional layer that helps reduce unpleasant odors from dampness or decay.
  • Housing and Casing: The durable exterior that contains the system and often includes handles or wheels.
  • Control Panel: Allows the user to adjust fan speeds and monitor filter status or runtime.

When Water Damage Pros Use Air Scrubbers

Pros deploy air scrubbers whenever a water loss incident is likely to aerosolize particles. This includes situations with significant demolition, such as removing wet drywall or flooring, which creates dust. They are also crucial if there is any visible mold growth or a musty odor suggesting hidden mold. The machines run throughout the drying phase to maintain air quality until the area is stable and dry.

What Homeowners Should Know About Operation

If pros are using air scrubbers in your home, you should keep certain doors closed to contain the air being treated. This helps the machine work more efficiently in the target zone. Avoid turning the units off, as continuous operation is necessary for effective air cleaning. The pros will handle all setup, filter changes, and takedown when the job is complete.

You might notice the sound of the fan, which is normal. The machines are placed to optimize airflow, so try not to move them. Their use is a standard practice for maintaining health and safety during restoration. Once drying is verified complete and the space is clean, the air scrubbers will be removed.

  • Containment: Keep doors to the work area closed to help the scrubber clean the target air.
  • Continuous Run: The unit should operate non-stop for days to effectively reduce airborne particles.
  • Professional Setup: The pros determine the correct number, placement, and settings for your specific situation.
  • Filter Maintenance: The pros monitor and replace filters as needed; homeowners do not need to handle this.
  • Safety Sign: Their use shows that airborne contaminants from the water damage are being managed.
  • Post-Job Air: After removal, your indoor air should be noticeably cleaner and fresher.

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Frequently asked questions

Can I rent or buy an air scrubber to use myself?

You can rent or purchase these units, but proper use requires training. Incorrect placement or filter handling can reduce effectiveness. For water damage, it's best to rely on the pros who integrate scrubbers into a full drying system. They have the tools and knowledge to ensure your air is properly cleaned.

Do air scrubbers remove mold or just the spores?

Air scrubbers only remove airborne mold spores from the air. They do not kill or remove mold growing on surfaces. Active mold growth on walls or materials must be physically removed and cleaned by a qualified mold professional. The scrubber is for air quality control during that remediation work.

How long do air scrubbers need to run after a leak?

They typically run for the entire duration of the active drying project, which often lasts three to five days. The exact time depends on the extent of water damage and humidity levels. The pros use moisture meters to determine when the structure is dry and the scrubbers are no longer needed.

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