HVAC REQUIREMENTS IN SURGERY AREA
(REFER TO VA DESIGN GUIDE, SURGICAL SERVICE, FOR GRAPHIC INFORMATION)
1. Indoor Design Conditions:
Area
Summer
Winter
HVAC Design
Degree C
Degree C
Manual Ref.
(Degree F)
(Degree F)
OR
17-27 (62-80) 45-55% RH
17-27 (62-80) 45-55% RH
Table 1-1
ICU
23-29 (75-85) 30-60% RH
23-29 (75-80) 30-60% RH
Table 1-1
Recovery
23 (75) 50% RH
23 (75) 30% RH
Table 1-1
2. Minimum Air Changes per Hour:
OR
15 (Occupied), 8 (Unoccupied)
Table 1-2
ICU
8 (All times)
Recovery
8 (All times)
3. Maintain positive pressure at all times in OR, ICU, and
Table 1-4
Recovery
4. Maintain NC40 in O.R.s
Table 1-5
5. Filtration: Prefilters 30%, and After-filters 95%.
Table 2-1
6. Dedicated, 100% outdoor air, with 100% exhaust, single duct,
3.21
constant volume with terminal reheat, low pressure system
7. Air distribution: 1/3rd in the middle and 2/3rd in the perimeter.
3.21.7
8. Low exhaust on two opposite walls
3.21.5
9. No duct lining permitted in supply air
3.21.5
10. Supply duct downstream of after- filters made of stainless
3.21.7
steel
11. Individual room temperature , and humidity controls for ORs
3.21.1
12. Individual room temperature controls for ICU, and Recovery
3.21.1
13. Provide a terminal humidifier for each OR.
3.21.8.1
14. Provide temperature and humidity recorders in each OR or a
3.21.8.2
read out at ECC
15. Provide energy recovery coils to recover energy
3.21.6
16. Dedicated air-cooled chilled for normal use for surgery suite
2.12.1.2 and 3.21
with back up from main chilled water system
17. Emergency power for air cooled chiller, air handling units,
2.16 and 3.21.4
exhaust fans, pumps, and control
Contact Satish Sehgal @202-565-5032, Kurt Knight @ 202-565-4663, Don Walden 202-565-5014 or Sat Gupta @ 202-565-5268
for additional information.
September 2001
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