An air scrubber is a portable HEPA and activated-carbon filtration unit required on mold, fire, sewage, and biohazard restoration jobs to keep airborne contaminants from spreading through your HVAC system during the work. It is also the piece of equipment most commonly skipped by corner-cutting contractors.
What an Air Scrubber Actually Does
A negative-air machine pulls room air through a three-stage filter (pre-filter, activated carbon, medical-grade HEPA). The clean air is exhausted outside the containment zone. Two outcomes: airborne particle counts drop, and the contained area stays at negative pressure so contaminants can't escape.
Jobs That Require One
- Mold remediation: mandatory per IICRC S520.
- Fire and smoke restoration: required during soot vacuuming and odor neutralization.
- Sewage / Cat 3 water: required during structural cutting.
- Trauma and biohazard cleanup: required for the entire scope.
- Drywall demolition near occupants with asthma or allergies: strongly recommended.
How to Verify the Right Equipment Is On Site
- Ask for the make, model, and CFM rating. Reputable units: BlueDri AS-550, Phoenix Guardian R, Dri-Eaz DefendAir HEPA 500.
- Ask for the HEPA certificate of analysis. True HEPA filters 99.97% at 0.3 microns.
- Ask how many air changes per hour the contractor is targeting. The answer should be 4 to 6.
- Ask whether they'll perform post-remediation verification (PRV) before tearing down containment.
Why Cheap Restoration Companies Skip This
A pro-grade air scrubber rents for $40 to $80 per day and HEPA filters cost $80 to $200 each. On a 5-day job that's $300 to $600 the contractor would rather pocket. The homeowner doesn't see what's missing until mold reappears in 90 days.
Related Reading
See ourmold-after-water timelineand ourOklahoma indoor air quality guidefor context on why containment matters.
Need a Properly Equipped Crew?
Call (405) 992-4111 for IICRC-certified mold, fire, and biohazard restoration with HEPA air scrubbers on every job and post-remediation verification included.
For the restoration work discussed here, see mold remediation.