Ill. Admin. Code tit. 77, § 205.TABLE A – General Pressure Relationships and Ventilation Rates of Ambulatory Surgery Area

Area Designation	Pressure Relationship to Adjacent Areas	Minimum Total Air Changes per Hour Supplied to Room	All Air Exhausted Directly to Outdoors	Recirculated Within Room Units

Procedure Room	+	15	Optional	No
Examination Room	0	6	Optional	Optional
Recovery Room	+	6	Optional	Optional
Medication Area	+	4	Optional	Optional
Medical Imaging Room	0	6	Optional	Optional
Soiled Workroom or Soiled Holding	-	10	Yes	No
Clean Workroom or Clean Holding	+	4	Optional	Optional
Darkroom	-	10	Yes	No
Toilet Room	-	10	Yes	No
Janitors' Closet	-	10	Yes	No
Sterilizer Equip. Rm.	-	10	Yes	No
Linen and Trash Rm.	-	10	Yes	No
Laboratory	-	6	Optional	Optional
Soiled Linen Storage	-	10	Yes	No
Clean Linen Storage	+	2	Optional	Optional
Anesthesia Storage	0	8	Yes	No
Central Services Area
Soiled Area	-	6	Yes	No
Clean Area	+	4	Optional	Optional
Equipment Storage	0	2	Optional	Optional
+ = Positive
- = Negative
0 = Equal

(Source: Amended at 48 Ill. Reg. 13763, effective August 28, 2024)