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. Author manuscript; available in PMC: 2016 Feb 15.
Published in final edited form as: J Occup Environ Hyg. 2014;11(7):434–449. doi: 10.1080/15459624.2013.875186

Table VII.

Evaluation of Temperature Sensitivity to Control Device Airflow, Recirculation, Pit Fan Airflow, and HeatersA

Percent of 3-Month period below 20°C
Control Device Operation
0.82 m3 s−1 pit fan flowrate 1.65 m3 s−1 pit fan flowrate
APC Flowrate,
m3 s−1 (cfm)		 %Recirculation 2 heaters 4 heaters 2 heaters 4 heaters
0.24 (500) 0 0 0 93 0.5
25 0 0 92 0
50 0 0 90 0
75 0 0 87 0
100 0 0 84 0
0.47 (1000) 0 39 0 98 25
25 22 0 96 15
50 0 0 93 0.5
75 0 0 90 0
100 0 0 84 0
0.94 (2000) 0 90 0 100 64
25 75 0 100 44
50 38 0 98 25
75 0 0 93 0.5
100 0 0 84 0
1.89 (4000) 0 100 76 100 96
25 99 35 100 89
50 90 0 100 64
75 39 0 98 25
100 0 0 84 0
A

Bold values (0 days) indicate temperature conditions are acceptable for optimum pig growth at the operation conditions indicated.