Volume II - 14 
Ventilation Design Handbook on Animal Research Facilities Using Static Microisolators 
Figure 1.13 Racks Perpendicular to Side Walls 
• Side Cracks of Cage Sealed Instead of Open: A series of cases was considered in which the 
side cracks of the cage were sealed, leaving the cage filter top as the only transfer 
mechanism. The main objective was to establish the relative increase in cage NH3 and CO 2 
levels when the secondary transfer mechanism was removed. 
• Density of Cages: The number of cages per rack was considered as a parameter. In addition 
to the basecase value of 42 cages per rack, a double density 84 cages per rack was also 
considered, as was a reduced density of 28 cages per rack. See figures 1.14 and 1.15. 
