3
HVAC REQUIREMENTS FOR OCCUPIED AREAS
3.1
AMBULATORY CARE - EVALUATION AND EMERGENCY AREA
3.1.1 GENERAL
(a) See Article 1.3 for indoor design conditions and exhaust requirements
for individual rooms.
(b) Provide a dedicated HVAC system to serve the evaluation and emergency
areas, including Minor Operating Rooms (O.R.s). The air-handling unit
shall operate 24 hours a day.
3.1.2 MINOR O.R. (Trauma Room)
Discuss with the medical center the need for full operating room HVAC
requirements. The HVAC systems for the Minor O.R.s (Trauma Rooms) shall
have the following features:
(a) Constant volume air supply for O.R.s. The remaining spaces of the
emergency suite can have variable air volume supply
(b) 100 percent exhaust of the supply air
(c) Individual room temperature control
(d) Individual room humidity control is not required
(e) Conventional overhead supply and exhaust air distribution. Special air
distribution, specified for the conventional O.R.s, is not required
(f) Maintain positive pressure in O.R.
3.2 AMBULANCE ENTRANCES
3.2.1 GENERAL
Ambulance entrances are required. They shall be enclosed where the outdoor
design temperature is below 12 degrees C (10 degrees F), as listed in the
99 percent column of Table 1, ASHRAE Handbook - Fundamentals. Provide a
minimum of 10 air changes per hour of exhaust air.
3.2.2 SPECIAL DESIGN CONSIDERATIONS
(a) Exhaust fan shall be activated automatically whenever ambulance
enters, and continues to operate for five minutes after ambulance leaves.
Provide 0-15 minutes time delay.
(b) Provide thermostat to cycle the exhaust fan when the indoor space
temperature exceeds 29 degrees C (85 degrees F).
(c) Provide outdoor air intake with power operated damper for exhaust fan
make-up air.
(d) Provide bottom wall register close to the rear of ambulance entrance
for half of exhaust and a ceiling register for the other half.
HVAC DESIGN MANUAL
3-1
HVAC REQUIREMENTS FOR OCCUPIED AREAS
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