Why ASHRAE 52.2 Still Matters for Modern Air Filtration

For applications concerned with airborne pathogens, the submicron ranges in the test are especially meaningful, since respiratory aerosols fall squarely within those bins.

Our work on HPAQ 3F is grounded in a deep understanding of these requirements. Designing media that performs reliably in the 52.2 framework means focusing on fiber structure, uniformity, and stability across the particle size ranges that drive MERV classification. It’s not about chasing a number—it’s about engineering materials that behave predictably when evaluated against a rigorous, industry standard method.

As conversations around IAQ continue to evolve, the ASHRAE 52.2 test remains a cornerstone for transparency and performance validation. Standards like this help ensure that filtration solutions—regardless of manufacturer—are evaluated on data, not assumptions. And that’s good for the entire industry.

As IAQ challenges shift, so must the standards that guide us. The 2025 update to ASHRAE 52.2 includes several meaningful shifts:

• Mass based PM efficiency reporting (aligning with PM2.5 frameworks used by EPA/WHO)
• An optional bioaerosol capture evaluation method (Appendix I)
• Closer alignment with ASHRAE Standard 241 for infectious aerosol control
• Greater emphasis on pressure drop stability and long-term performance

These changes reflect a broader industry move toward health based IAQ metrics and more realistic evaluation of filtration behavior. At the end of the day, ASHRAE 52.2 endures because the industry still needs a clear, trusted way to measure what truly counts.