What Is an Air Scrubber
An air scrubber is a portable air filtration unit that removes mold spores, dust, and other airborne contaminants from indoor spaces during and after mold remediation. Most units use HEPA filters (High-Efficiency Particulate Air) rated to capture 99.97% of particles 0.3 microns or larger. This includes most mold spores, which typically range from 2 to 10 microns in size.
Air scrubbers operate by drawing contaminated air through the filtration system and exhausting cleaned air back into the room. They're essential tools for controlling airborne mold during active remediation work and for clearing residual spores afterward. The EPA doesn't mandate their use in every mold remediation scenario, but professional remediators use them in most cases where disturbing mold-affected materials will release spores into the air.
Role in Mold Remediation
During remediation, contractors run air scrubbers continuously to prevent mold spores from spreading to unaffected areas of your home. A single active mold colony can release millions of spores into the air when disturbed. Newer air scrubber models process between 300 and 1,000 cubic feet per minute (CFM), meaning they can handle whole-room air exchange multiple times per hour when sized appropriately.
After remediation ends, air scrubbers continue running for 24 to 48 hours to remove lingering spores. Post-remediation verification often includes air quality testing. Professional inspectors take spore samples from affected rooms and compare them to baseline samples from unaffected areas. Air scrubbers help bring elevated spore counts back to normal ranges, typically under 1,000 spores per cubic meter of air.
Moisture Control Connection
Air scrubbers address the symptom (airborne spores) but not the root cause (excess moisture). HVAC systems and negative air machines complement air scrubbers by managing moisture conditions. If humidity levels remain above 60% after remediation, new mold growth will develop within 24 to 72 hours, making the air scrubber's work temporary. Proper moisture remediation, including dehumidification and source removal, must accompany air scrubber use.
Health Considerations
Exposure to elevated mold spores causes respiratory irritation, allergic reactions, and asthma exacerbation in sensitive individuals. People with compromised immune systems face higher risk. Running air scrubbers during remediation reduces workers' and occupants' exposure to these contaminants. The CDC recommends vacating the affected area during active mold removal work, with air scrubbers running continuously.
Common Questions
- Can I rent or buy an air scrubber for my home? Yes, both options exist. Portable units cost $300 to $800 for household use. Rental companies typically charge $40 to $100 per day. Professional-grade units (1,000+ CFM) run $1,000 to $3,000 and aren't practical for one-time use.
- How often should I replace the HEPA filter? Manufacturer recommendations vary, but filters typically need replacement every 6 to 12 months with regular use. Dirty filters reduce airflow efficiency and filtration effectiveness. Check the filter monthly for visible dust accumulation.
- Do I need an air scrubber if the mold is only in walls? If drywall removal is happening, yes. Any time cavity mold becomes exposed during remediation, an air scrubber running during work prevents spore release into occupied areas.