Volume I - Section III - Evaluation of Results and Recommendations 
Page III - 21 
Figure 3.24 Comparison of Room Breathing Zone Temperature (°C) 
The cage temperatures vary very little in comparison with the variation in supply temperature 
(from 19.8 °C (68 °F) to 6.6 °C (44 °F)) and follow the trends shown in the breathing zone 
temperature. The slightly lower supply temperatures in the double density cases (more mice 
produce more heat to be extracted) lead to a small reduction in both room and cage temperatures 
compared with the single density racks. 
Figure 3.25 Comparison of Mean Cage CO 2 Concentrations (ppm) 
Increasing the room ventilation rate does not have a large effect on the cage ventilation. 
Increasing the supply flow rate from 5 ACH to 20 ACH for single density racks parallel to the 
