Pre-purchase and technical reference for IAS nuclear air purification products. Answers to the most common questions from procurement engineers, facility managers, and project teams worldwide.
For hospital engineers, designers, contractors and infection prevention teams: a one-document pass through the filtration decisions on a healthcare ventilation project under ASHRAE 170-2025 and FGI 2026 — before they become RFIs.
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Confirm the adopted FGI and ASHRAE 170 editions with the AHJ · List every space by its FGI 2026 space type so the correct table row applies · Record the required filter efficiency per space (for example MERV 7 pre-filter, MERV 14 or MERV 16 final filter, or HEPA at the terminal) · Document equivalence for filters rated to non-ASHRAE 52.2 methods · For nuclear medicine and I-131 areas, coordinate 170 pressure and exhaust with radiation-protection requirements (HEPA plus activated carbon) · Check exhaust discharge locations and stack heights against outdoor air intakes · Plan Section 10 construction ventilation (negative pressure, HEPA exhaust, intake protection) · Check outpatient turndown against pressure relationships · Decide whether ASHRAE 241 infection risk management mode applies · Specify filter access, differential pressure gauges and replacement intervals.
1. Optional natural ventilation · 2. Total outdoor air at the system level · 3. Class 2 and 3 imaging, nuclear medicine · 4. Outpatient unoccupied turndown · 5. Separation distances and stack heights · 6. Behavioral health · 7. Reserve capacity and on-site fuel · 8. Section 10: ventilation during construction · 9. Alternative filtration test methods · 10. Consistent table requirements · 11. Bronchoscopy · 12. FGI 2026 space types.
Read the companion article: What changed in ASHRAE 170-2025 for healthcare air filtration, and our hospital & healthcare air purification overview.