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Ventilation Design Handbook on Animal Research Facilities Using Static Microisolators 
Figure 3.11 Comparison of Mean Cage CO 2 Concentration (ppm) 
Figure 3.12 Comparison of Room Breathing Zone CO 2 Concentration (ppm) 
The lower values of CO 2 concentration in the cages for the low level exhaust (up to 27 percent 
for the radial diffuser, 4 percent for the slot diffuser and 25 percent for the low induction 
diffuser) indicate that the cages are better ventilated in this situation. The room values show the 
best ventilation occurs with a radial diffuser and ceiling level exhausts. 
