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MEP Systems in Healthcare Facilities Flashcards

7 cards from real CHC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. According to ASHRAE 170, what is the minimum number of total air changes per hour (ACH) required for an operating room?

    Answer: 20 ACH

    ASHRAE 170 requires a minimum of 20 total air changes per hour for operating rooms to maintain sterile conditions and dilute airborne contaminants.

  2. What type of pressure relationship must an Airborne Infection Isolation (AII) room maintain relative to the adjacent corridor?

    Answer: Negative pressure

    AII rooms must maintain negative pressure relative to adjacent areas to prevent airborne pathogens from escaping into the corridor and infecting others.

  3. Which ASHRAE standard specifically governs ventilation requirements for healthcare facilities?

    Answer: ASHRAE 170

    ASHRAE 170 'Ventilation of Health Care Facilities' is the primary standard governing ventilation system design in healthcare settings and is referenced by the FGI Guidelines.

  4. What is the minimum negative pressure differential required between an Airborne Infection Isolation room and the adjacent corridor per CDC and ASHRAE 170 guidelines?

    Answer: 0.01 inch water gauge

    A minimum differential of 0.01 inch water gauge (approximately 2.5 Pa) is required to maintain consistent negative pressure in AII rooms without making doors difficult to open.

  5. What air supply system configuration is required for operating rooms to prevent cross-contamination between spaces?

    Answer: 100% outside air single-pass system

    Operating rooms require 100% outside air single-pass systems with no recirculation from or to other spaces to prevent pathogen spread between areas.

  6. Per ASHRAE 170-2017, what is the acceptable relative humidity range for operating rooms?

    Answer: 20–60% RH

    ASHRAE 170-2017 updated the operating room humidity range to 20–60% RH, expanding the lower limit from the prior 30% minimum to reduce energy use without compromising safety.

  7. Which filter efficiency is required at the final filtration stage for operating room air supply systems per ASHRAE 170?

    Answer: MERV 17 (HEPA equivalent)

    ASHRAE 170 requires MERV 17 or higher (HEPA-grade) final filtration for operating room air supply to capture 99.97% of particles 0.3 microns and larger.