1. ASHRAE. ASHRAE Standard 52.1: gravimetric and dust-spot procedures for testing air-cleaning devices used in general ventilation for removing particulate matter. Atlanta: American Society of Heating, Refrigerating, and Air-Conditioning Engineers; 1992. p. 32.
2. Parameters for ventilation controlled environments in hospitals;Streifel,1998
3. Pressure relationships in hospital critical-care facilities;Streifel;Proc Indoor Air,1999
4. Guidelines for design and construction of health care facilities;Facility Guidelines Institute,2006
5. Centers for Disease Control and Prevention,2003