Broiler house thermal image. Cooler (purple) at floor; warmer (orange) at ceiling. a) Mixing fans off. Thermal stratification higher with more warmer air at ceiling. b) Fans on.

Figure 2. Thermal stratification in a broiler house with tube heaters with (a) mixing fans off and (b) mixing fans on. Temperature (°F) measurements were made on black aluminum strips just above the litter and just below the ceiling. Note the high temperature at the drop ceiling above the tube heater.