Volume II - 6 
Ventilation Desien Handbook on Animal Research Facilities Usin 2 Static Microisolators 
with only 10 percent leakage defined at the sash opening. The makeup air intake for this leakage 
was mounted at the side of the station. The station dissipated heat that was expected to affect the 
room’s overall flow field. In particular, the station contributed a load of 720W to the room. This 
heat was mostly confined to the lower portion of the station where the motor was located. 
Figure 1.03 Original Change Station Design 
Due to concerns raised over the relative passiveness of the first station design, a second design 
was considered, as is displayed in figure 1 .04. The station had overall dimensions of 1 .50m (59”) 
X 0.86m (34”) x 1.93m (76”) high. This station also recirculated air, at 300 cfm (1.42e-l m^ /s), 
but discharged a much higher percentage than the first design. In particular, 200 cfm (9.44e-2 
m^/ s) was discharged through grilles at the top of the station. The air makeup to compensate for 
this discharge was mounted at the front sill at the opening to the station. The station dissipated 
660W, and this heat was considered to be added to the air discharge at the top of the station. 
