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Ventilation Design Handbook on Animal Research Facilities Using Static Microisolators 
3.3 Ranking of Whole Room Simulations 
The following tables (3.07 to 3.14) present rankings of the results of the CFD room simulations 
based on room (scientist’s breathing zone) and cage mean values for temperature, relative 
humidity, and CO 2 and NH 3 (day 4) concentrations. The tables start with the case with the lowest 
value and list the rest in ascending order. In addition to the case number, which should be used to 
identify all details of the case, the supply diffuser type, exhaust location, supply flow rate, and 
supply discharge temperature are given to provide a quick overview of the case. 
Tables 3.07 and 3.08 for temperature show the ceiling exhausts produce lower temperatures in 
both the room and cages, ignoring the two 5 ACH cases which start with very low supply 
temperatures. Tables 3.09 and 3.10 for relative humidity show that the low exhaust cases seem to 
dominate the table producing low humidity. This is also a consequence of the low exhaust rooms 
and cages being warmer than the ceiling and high level exhausts. 
Table 3.11 showing room breathing zone CO 2 concentration shows the ceiling and high level 
exhausts producing the lowest values. The overall variation is very small in absolute terms. It is 
interesting to see that the first 20 ACH case comes 50th in the list. This indicates that with the 
right design it is possible to ventilate a room better than by simply providing more air. 
Table 3.12 showing CO 2 concentration in the cages also shows relatively small variations across 
the cases. No particular configuration presents itself as always performing better than the others. 
Tables 3.13 and 3.14 show NH 3 concentrations in the room and cages on day 4. The room data 
shows no particular pattern. The cage data shows rather more low exhaust cases giving low 
values, which is due to the higher temperature and related lower relative humidity reducing the 
actual NH 3 generation rate. 
In all of the ranking tables, no single configuration proves to be superior in all respects. This 
further illustrates that the airflow patterns and thus the ventilation of the room and the cages 
depends on the complex interaction of all of features in the room. 
