Volume I - Section II - Animal Room Variations 
Page II ■ 41 
Table 2.13 Basecase (Case 01): Temperature, C0 2 Concentration and RH in the Breathing 
Zone 
Temperature ("C 
CD) 
CO 2 (ppm) 
RH (percent) 
Mean 
20.3 (68.5) 
36 
55.4 
Maximum 
21.8 (71.2) 
137 
- 
Standard Dev. 
0.5 (0.9) 
20 
- 
The temperature is cool in the room up to the top of the breathing zone compared to the design 
exhaust temperature of 22.2 °C (72.0 °F). This is due to the stratification occurring in the room in 
combination with the location of the exhausts on the ceiling, which means that the highest 
temperature occurs at the exhaust at the top of the room. 
The variation of NH3 concentration in ppm in the breathing zone over the 10-day cycle is shown 
below: 
Table 2.14 Basecase (Case 01): NH3 Room Breathing Zone Concentrations (ppm) over a 10- 
Day Cycle in the Breathing Zone 
Day 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
Mean 
0.02 
0.04 
0.06 
0.11 
0.18 
0.26 
0.40 
0.49 
0.59 
0.63 
Max 
0.07 
0.14 
0.21 
0.40 
0.68 
1.01 
1.51 
1.88 
2.55 
2.43 
This shows that the performance of the ventilation system in this room configuration is very 
satisfactory. The average NH3 concentration does not rise above 0.6 ppm even after 10 days. 
However, the peak value rises above 1 ppm after 6 days. This indicates that any Scientist 
working in the area where the maximum value occurs is likely to remark that NH3 is noticeable 
in the room. Too much importance should not be attached to this number because the 
concentration may only occur in a very small localized region in the room. 
The situation in the cages is summarized below: 
Table 2.15 Basecase (Case 01): Temperature C0 2 Concentration and RH in the Cages 
Temperature C“C 
(°F)) 
C0 2 (ppm) 
RH (percent) 
Mean 
22.1 (71.8) 
2158 
66.8 
Maximum 
23.0 (73.4) 
3133 
66.8 
Standard Dev. 
0.4 (0.7) 
359 
2.6 
