Hospitals concentrate vulnerable patients, infectious aerosols and clinical contaminants in shared envelopes. HTM 03-01 prescribes ventilation strategy by room type — theatres, isolation rooms, pharmacy aseptic suites — but real-world performance depends on commissioning, filter integrity and pressure stability.
01
Why healthcare air is different
02
HTM 03-01 essentials
Theatres. 20–25 ACH, positive pressure, HEPA H13 filtration, validated by annual specialised verification.
Isolation rooms. ≥10 ACH, negative pressure for source-isolation; positive for protective.
General wards. 6 ACH, ePM1 ≥50% filtration.
03
Continuous verification
Pressure differentials, filter loading, CO₂ and PM2.5 should be monitored continuously — annual SVP visits are insufficient for risk-critical environments. IAQ monitoring →