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Ventilation Design Handbook on Animal Research Facilities Using Static Microisolators 
Change Station Model 
Two alternative change stations were considered in this project. Both stations were constructed 
primarily from rectangular blocks and triangular prisms. The internal structure and flow field 
were of no concern in this project. It was only the effect of the station on the room airflow that is 
of importance. 
The first design is shown in figure 2.04 and is based on a Thoren Maximiser. The station had 
overall dimensions 1.32m (52”) x 0.86m (34”) x 1.83m (72”). This design was effectively 
passive in terms of direct flow field interaction. In particular, the station internally recirculated a 
flow of 350 cfm (1.65e-l m 3 /s) 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 rooms 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. 
