Converts any thermal air flow Hova-Bator into a circulated air incubator. Dimensions: 3 3/4" x 3 3/4" x 2 1/3" -110Volt -"Turbofan" can be installed in any square Hova-Bator type incubator and permits you to operate the incubator at one temperature for all types of eggs and for all climate conditions with less close supervision.