Healthcare Facility Design, Infrastructure, and Utilities
Healthcare facility design, infrastructure, and utilities covers the physical systems that support care: electrical distribution, emergency power, medical gases, ventilation, water, and shielding. The exam tests design standards and commissioning logic.
Core rules and concepts
- NFPA 99: healthcare facilities code; risk categories and requirements for electrical, gas, vacuum, and environmental systems.
- NFPA 101: Life Safety Code; egress, fire alarm, and defensible space.
- Ventilation: ASHRAE 170 sets pressure relationships and air changes; operating rooms are positive pressure, airborne infection isolation rooms negative.
- Utilities: emergency generators, automatic transfer switches, medical gas alarms, vacuum, and purified water; verify with load tests and alarm tests.
- Design review: involve clinical engineering before construction, not after.
Worked example
An operating room project specifies 20 total air changes per hour, positive pressure, emergency power, and medical gas alarms. Commissioning should verify airflow direction, pressure differential, alarm annunciation, and generator transfer under load, with results recorded.
Traps
Do not confuse design intent with verified performance. Do not assume a generator starts means it carries load. Do not let medical gas outlet labels substitute for zone valve verification.