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What Are HEPA Air Scrubbers and How Do They Work?

Last updated October 23, 2026

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The short answer

The Core Components of an Air Scrubber

An air scrubber has a powerful fan that draws air into the unit. Inside, air first passes through a pre-filter that catches larger debris like hair and lint. This pre-filter protects the more sensitive and expensive main HEPA filter from clogging too quickly, allowing it to function effectively for a longer period during a cleanup project.

The main filter is a High-Efficiency Particulate Air (HEPA) filter. True HEPA filters must capture at least 99.97% of particles that are 0.3 microns in size. Some units also include an activated carbon filter, which uses a bed of charcoal to adsorb odors and volatile organic compounds (VOCs) that can accompany water damage and microbial growth.

How the Filtration Process Works

The process begins when the fan creates negative air pressure, pulling room air into the machine. Contaminated air moves through the pre-filter first, which removes visible dust and fibers. This initial step is crucial for maintaining the efficiency and lifespan of the delicate HEPA filter that performs the final, fine cleaning of the air.

After the pre-filter, air is forced through the dense, pleated material of the HEPA filter. This filter acts like a microscopic net, capturing tiny particles such as mold spores, bacteria, pollen, and fine dust. Finally, if the unit has one, air may pass through a carbon filter to neutralize unpleasant smells before the clean air is exhausted back into the environment.

Why Air Scrubbers Are Used in Water Damage Restoration

When materials in your home get wet, mold can begin to grow in as little as 24 to 48 hours. Drying equipment like air movers and dehumidifiers can accidentally aerosolize mold spores and other contaminants during the drying process. An air scrubber runs continuously to capture these airborne particles, helping to prevent their spread to other, unaffected areas of your home.

The goal is to create a containment zone, especially during mold remediation or major flood cleanup. Running an air scrubber helps protect the health of everyone in the home by reducing inhalation risks. It also aids the pros in keeping the work area clean, which can be critical for a successful and thorough restoration.

Key Situations That Require an Air Scrubber

Not every water damage event requires an air scrubber. They are essential tools for specific, more serious scenarios. Their use is a sign that the restoration job involves significant contamination risks that need active management to ensure a safe and complete cleanup for your living space.

Air scrubbers are commonly deployed for sewage backups, Category 3 'black water' floods, and any situation with confirmed or suspected mold growth. They are also vital during demolition work, like cutting out wet drywall or removing damaged flooring, as these activities can release a large amount of particulates and spores into the air.

  • Sewage backup or toilet overflow cleanup.
  • Flood damage from rivers, storm surges, or ground water.
  • Any water damage where visible mold is present.
  • Large-scale water events affecting multiple rooms.
  • During demolition of wet building materials.
  • When occupants have allergies, asthma, or other respiratory concerns.

What Homeowners Should Know About Operation

If local water damage pros set up an air scrubber in your home, they will position it for optimal airflow. It needs space for air intake and exhaust, and it should run continuously, often for several days, until the environment is stabilized. The machine will make a constant fan noise, which is normal and indicates it is working to clean your air.

You should not turn the unit off or move it. The pros will monitor it and change the filters as needed. After the job, they properly dispose of the used HEPA filters, which are considered contaminated waste. If you live in New Orleans, the humid subtropical climate can prolong drying times and increase mold risk, making proper air filtration especially important.

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Frequently asked questions

Can I rent and use an air scrubber myself?

While rental is possible, proper use requires knowledge of placement, airflow, and safety. For mold or contaminated water, incorrect use can spread spores. It's generally best to leave this equipment to the pros who are trained in containment and health protocols.

How long does an air scrubber need to run?

The runtime depends entirely on the job's severity. It often runs nonstop for several days alongside drying equipment. The pros will determine when particle counts are acceptably low and the environment is clean and dry before shutting it down.

Do air scrubbers remove the smell from water damage?

A standard HEPA filter does not remove odors. For smells, a unit needs an additional activated carbon filter. These filters adsorb odor-causing molecules. For strong sewage or persistent musty smells, a carbon filter is a critical component of the air scrubbing system.

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