Volume II - 4 
Ventilation Design Handbook on Animal Research Facilities Usin£ Static Microisolators 
Figure 1.02 CFD Model of Cage Rack 
Located on the shelves of the racks were representations of the animal cages, shown in figure 
1.02. The dimensions of the cage were 0.27m (10.7”) x 0.16m (6.38”) x 0.21m (8.39”) high, 
which maintained the volume of the original cage that had sloped sides. The sides of the cage 
were modeled as thin plates, with the thickness and conductivity of the plates set to those of the 
physical cage polycarbonate. The water bottle and food normally found in a cage were modeled 
as a single block in order to reduce the computational overhead. The volume of the block was the 
same as that of the bottle and food combined. The bedding of the cage was included as a 
rectangular block of 0.27m (10.7”) x 0.16m (6.38”) x 1.27e-2m (0.5”). 
The mice were modeled as a block of 0.11m (4.25”) x 8.57e-2m (3.38”) x 0.22m (0.88”), the 
same representation that was used in the experimental cage wind tunnel tests (see volume I, 
section 4.1.1). This simulated the effect of ‘huddling’ by the mice. The surface temperature of 
the block was fixed at 30.0 °C (86.0 °F), which is agreed to be a typical mouse body surface 
temperature. 
Surrounding this block, a source of CO 2 was defined at 2.12e-7 kg/s (0.76g/hr), which was based 
on the generation rate indicated for the dark period in the early tests on the effect of the 
