through the wall should have a double offset in the form of a Z. The
offset in the Z should be at least 200 mm (8 inches) long.
(b) In a super voltage, or similar room, with thick concrete shield, lead
shielding is not required for ducts penetrating the room wall beyond the
shield inside the room.
(c) Dark
rooms require a full height lead lining. However, the wall
adjacent
to Radiographic or similar rooms the normal lead lining is only 2
m (7 ft)
high. Ducts penetrating this wall above the suspended ceiling may
not need
lead shielding.
3.20 SPD (SUPPLY, PROCESSING AND DISTRIBUTION)
3.20.1 GENERAL
ethylene oxide sterilizer (ETO) and associated items.
3.20.1.2 Provide a dedicated, 100 percent outdoor air, constant volume
air-handling unit to serve the SPD suite.
3.20.2 INDOOR DESIGN CONDITIONS
Summer: 24 degrees C (76 degrees F) Db, 50 percent RH
Winter: 22 degrees C (72 degrees F) Db, 30 percent RH
3.20.3 SUPPLY AIR AND ROOM PRESURE
See Table 3-4.
Table 3-4 Minimum Supply Air and Room Pressure Requirements
Area
Minimum Supply Air
Room Pressure
Changes Per Hour
Administrative Office
4
0
Corridors
4
0
Lounge
6
0
Soiled Decontamination Area
10
Negative
Clean Preparation Area
10
Positive
Lockers, Toilets and Shower
10
Negative
ETO Sterilizer/Aerator Room
10
Negative
Equipment Wash Area
10
Negative
Equipment Room
10
0
Equipment Storage and Testing Room
4
0
ETO Sterilizer Room
10
Negative
General Storage Room
4
0
3.20.4 EMERGENCY POWER REQUIREMENTS
ETO exhaust systems shall be on emergency power.
3.20.5 REFERENCE DOCUMENT
See Design Guide "Supply, Processing and Distribution" for requirements in
individual rooms.
HVAC DESIGN MANUAL
3-21
HVAC REQUIREMENTS FOR OCCUPIED AREAS
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