Volume I 
Figure 0.5 Day 4 mean ammonia concentration (ppm) in cages for Radial, Slot and Low 
Induction supply diffusers with Ceiling, High-Level and Low-Level Exhausts 
The room concentrations of CO 2 and ammonia do not show any supply or exhaust type to 
be significantly better or worse than any other type (see figures 0.6 and 0.7). Of the many 
supply diffuser and exhaust locations considered in this work, it is not possible to select 
one configuration which will always perform better than another. Designers and operators 
of animal facilities will need to consider carefully which parameters are important to 
them and select a layout which balances all their requirements for animals and the 
humans that work with them. 
