(2) Filters for room fan coil units and packaged air conditioners shall be
manufacturer's standard.
(3) Filters for the central ventilation air handling units providing minimum
outdoor air for fan coil systems or radiant ceiling panel systems, shall be
equipped with 50 mm (2 inch) thick throw-away pre-filters of 15 percent
efficiency and after filters of 60 percent efficiency. For patient care areas
such as patient bedrooms, examination and treatment rooms etc., after-filters
shall be 85 percent efficient.
(4) Filters for the central air handling units serving patient bedrooms,
examination and treatment rooms, etc., shall be equipped with pre-filters of
30 percent efficiency and after-filters of 85 percent efficiency. For
critical areas, the after-filter efficiency would be as high as 99.97 percent
efficiency.
(5) Following Table 2-1 lists filters efficiency for various areas:
Table 2-1 FILTER EFFICIENCIES (PERCENT) FOR ALL AIR SYSTEMS
Area Served
Pre-filters
After-filters
(Efficiency)
(Efficiency)
Animal Holding Areas
30
85
Animal Operating Rooms
30
95
Administrative areas, conference rooms, and
15
60
lobbies
Auditoriums, Chapels, and Theaters
15
60
Autopsy Suite exhaust
30
99.97; HEPA
Filters
Autopsy Suites supply air
30
85
BMT Suites
30
99.97; HEPA
Filters
Burn Unit
30
99.97; HEPA
Filters
Clean supplies and processing areas
30
85
Dental Clinics
30
85
Dialysis Rooms
30
85
Dietetics (Kitchen and Dining areas)
15
60
Emergency Care Units (Ambulatory Care}
30
85
Gymnasium
15
60
Heat recovery Units (In exhaust air on
30
-
upstream side of the coil)
Human Immunodeficiency Virus (HIV)
30
99.97; HEPA
Filters
ICUs utilizing return air system
30
99.97; HEPA
Filter
ICUs and Recovery Rooms in surgical suite
30
95
Isolation Room exhausts. For TB isolation,
30
99.97; HEPA
see Article 3.22
Filters
Laboratories, supply system
30
85
Laundries, soiled holding areas, and bulk
30
-
storage
MRI, CT Scanners, and Linear Accelerators
30
85
Nuclear Medicine
30
85
Operating Rooms, and Trauma rooms
30
95
HVAC DESIGN MANUAL
2-7
HVAC SYSTEMS AND EQUIPMENT
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