20 CAR pt. 41, Appendix B – Table 1 - Filter Efficiencies for Central Ventilation and Air Conditioning Systems in Health Care Facilities

TABLE 1

Filter Efficiencies for Central Ventilation and Air Conditioning Systems in Health Care Facilities
Area Designation	No. Filter Beds	Filter Bed No.1 (%)	Filter Bed No.2¹ (%)
All areas for patient care, treatment, and diagnosis, and those areas providing direct service or clean supplies such as sterile and clean processing.	2	30	90
Protective Environment Room 2	2	30	99.97
Laboratories	1	80	-
Administrative, Bulk Storage, Soiled Holding Areas, Food Preparation Areas, and Laundries	1	30	-

These requirements do not apply to small outpatient clinics or outpatient clinics that do not perform invasive applications or procedures.

Notes: The filtration efficiency ratings are based on average dust spot efficiency per ASHRAE 52.1 – 1992.

Additional roughing or prefilters should be considered to reduce maintenance required for filters with efficiencies higher than 75 percent.