Air Cleaning Fundamentals - Summary
The Swiss IAQ Specialists
Wide range of indoor contaminants are of concern
(particles, gases, biologicals)
Insufficient IAQ leads to sick-building-syndrome and
loss of work days
The proper layout and functioning of HVAC systems
play a big role to assure a healthy environment.
MERV 13 (EN F7) or better particle filtration can play a
role in infectious disease transmission, but running
costs are substantial.
ASHRAE Position (June 2009)
Acknowledges the role of HVAC systems in
the dissemination of airborne diseases in
buildings
Key Points:
Infectious diseases can be transmitted
via airborne path
It can be spread by a building’s HVAC
system
Designers have a responsibility to
minimize risks
ASHRAE Position Document on Airborne Infectious Diseases. Table 3.
Airborne Infectious Disease Engineering Control Strategies: Occupancy Categories applicable for Consideration
and Research Priorities
Strategy
Occupancy Categories
Research Priority
Dilution Ventilation
All
9
Personalized ventilation
1, 4, 6, 9, 10
8
Source capture
1, 2, 8, 14
10
Central system filtration
All
4
Local air filtration
1, 4, 6, 7, 8 10
5
Upper room UVGI
1, 2, 5, 6, 8, 9, 14
1
In-room UVGI
1, 2, 7, 8, 14
3
Duct UVGI
1, 2, 3, 4, 5, 6, 8, 9, 14
2
In-room flow regimes
1, 6, 8, 9, 10, 14
7
Differential pressurization
1, 2, 7, 8 11, 14
6
1. Health Care (Residential and Outpatient)
2. Correctional Facilities
3. Educational < age 8
4. Educational > age 8
5. Food and Beverage
6. Internet Café / Game Rooms
7. Hotel, Motel, Dormitory
8. Residential Shelters
9. Public Assembly & Waiting
10. Transportation Conveyances
11. Residential Multi-Family
12. Retail
13. Sports
14. Laboratories where infectious diseases
vectors are handled.
Occupancy Categories
