RESPIRABLE DUST CONTROL IN A SCALE-MODEL HORSE STABLE USING FILTRATION AND MECHANICAL VENTILATION

Respirable dust levels were studied using a model stable in which mech anical ventilation, filtration, and designed air flow were used for re spirable dust control. Various inlet ventilation and exhaust fan opera ting levels were tested. Different bedding materials and stable door c onfigurations also were tested. The model was adapted to include an in let distribution ceiling attic to diffuse the inlet air in a downward direction throughout the stable. The inlet air was delivered through a series of filters by an axial inlet fan to the distribution attic. Tw o exhaust fans were located at the side walls of the chamber near the floor. Tests showed that the respirable dust levels within the stable remained low (< 10 counts/mL) although the respirable dust levels at t he incoming inlet ventilation position varied widely. Bedding of straw , shredded paper, and wood shavings was evaluated by agitating the ind ividual bedding material and recording the level of respirable dust at 3 min periods. The control system reduced to low levels (< 10 counts/ mL) within 12 min for both straw bedding and shredded paper. Wood shav ings produced little respirable dust.