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Ventilation Design Handbook on Animal Research Facilities Using Static Microisolators 
Figure 3.55 Comparison of Mean Breathing Zone NH 3 Concentrations (ppm) 
The in-cage values are slightly reduced for both the radial and low-induction supply diffusers, 
while the room values show little change or some increase. As is often the case, improving the 
cage ventilation seems to degrade the room performance. 
3.1.9 Supply Temperature 
The experimental data for the generation of NH3 indicate that NH3 is produced at a higher rate 
when the relative humidity is high. As the relative humidity decreases with increasing 
