INDOOR AIR QUALITY
TOPIC: AIR FILTRATION
ISSUE:
Air filter efficiencies for heating, ventilating and air-conditioning systems.
BACKGROUND:
Filter efficiency is important in achieving the desired level of clean air. The higher
the efficiency of an air filtration system, the greater the benefits in reducing
pollutants entering the occupied space. Many a times, design consultants specify
wrong filters and the systems have to be redesigned to suit the occupancy.
Following are recommended efficiencies of filters for various occupancies. These
should be implemented on future projects. The efficiencies are in percentages and
are based on ASHRAE Standard 52.1.
.
Area Served
Pre -filters
After-filters
Animal Holding Areas
30
85
Animal Operating Rooms
30
95
Administrative areas, conference rooms, and lobbies
*15
60
Auditoriums, Chapels, and Theaters
*15
60
Autopsy Suite exhaust
30
HEPA (99.97%)
Autopsy Suites supply air
30
85
BMT Suites
30
HEPA (99.97%)
Clean supplies and processing areas
30
85
Dental Clinics
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 upstream side of the coil)
30
-
6 February 1998
FM-187C-DA84
1
Previous Page
