This unit are for taking care of a matress as Lynne stated. I can see why you would think chickens and such but it isn't the case. The only way to gid rid of bed bugs is with extreme heat. A matress is put into the unit and the heat is turned up to kill the bed bugs in all stages of life. 120-125F) and 20-30% relative humidity for 20-30 minutes. The heat treatment provided no residual effect, so the matress was safe to sleep on without worry of chemicals.

The wire mesh at the top of the doors was to provide proper airflow for humidty and temp. control.

Hope that settles things.