Introduction
Mold remediation efforts have long faced challenges in effectively dealing with Condition 2 settled spores, which refer to non-visible spores that persist after traditional cleaning. These spores, unlike those in Condition 3 (visible mold contamination), require specialized techniques for detection and removal. This article explores a novel approach to handling Condition 2 settled spores, focusing on “air polishing,” and examines its efficacy through case studies.
Why Traditional Methods Fall Short
Settled spores are solid particles that cannot move independently and require airflow to become airborne. Traditional methods, such as HEPA vacuuming and extended use of air scrubbers, often fail to address spores hidden in quiet zones (e.g., room edges, corners, or rafters).
Consider the analogy of clearing leaves with a blower: simply running a blower in one direction leaves debris untouched in less disturbed areas. Similarly, fixed-direction airflow from carpet fans or air scrubbers cannot mobilize all spores effectively, leading to incomplete remediation.
Air Polishing: A Comprehensive Approach
Air polishing enhances traditional remediation techniques by disturbing and mobilizing settled spores for filtration. This protocol includes:
- Containment and Preparation
- Maintain the containment area with workers wearing protective gear.
- Ensure air filtration units (AFUs) are cleaned and operating efficiently.
- Oscillating Fans for Disturbance
- Deploy oscillating fans to cover the area, ensuring drafts reach quiet zones.
- Use approximately one fan per 100 square feet, adjusting based on the room’s shape and size.
- Strategic Leaf Blowing
- Employ leaf blowers periodically to agitate spores from baseboards, elevated surfaces, and hard-to-reach areas.
- Redirect the airflow from fans and AFU exhausts to target different zones.
- Continuous Monitoring and Adjustments
- Operate the system for 36–48 hours per area to maximize spore mobilization and filtration.
Case Study: Evaluating Air Polishing Effectiveness
In a residential remediation project, four areas (A–D) were initially treated using HEPA vacuuming and wiping. Paired (quiet and disturbed) sampling was conducted to measure spore levels before and after remediation:
- Initial Results
In Area B, disturbed air sampling revealed a 24-fold increase in Aspergillus-Penicillium (Asp-Pen) spore levels compared to quiet sampling, indicating persistent settled spores. In Area D, disturbed sampling showed a 120-fold increase, further highlighting the limitations of traditional methods. - Post-Air Polishing Results
Air polishing significantly reduced spore levels:- In Area B, disturbed Asp-Pen spores decreased by over 95%.
- In Area D, disturbed Asp-Pen spores were reduced by 99.4%.
These results demonstrate the efficacy of air polishing in reducing both quiet and disturbed spore levels, ensuring a cleaner and safer environment.
Conclusion: The Case for Air Polishing
Air polishing offers a cost-effective and efficient solution for addressing Condition 2 settled spores. By combining oscillating fans, strategic leaf blowing, and AFUs, this method ensures thorough remediation, minimizing the likelihood of return visits and enhancing client satisfaction.
With documented success, air polishing sets a new standard in mold remediation, achieving a cleaner, safer space and streamlining the remediation process.
References
- IICRC S520-2008 Standard and Reference Guide for Professional Mold Remediation
- U.S. Environmental Protection Agency Mold Course
- Centers for Disease Control and Prevention Aerosol Guidance
By integrating these advanced techniques into remediation protocols, professionals can significantly improve outcomes, paving the way for industry-wide adoption of air polishing as a best practice.
