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.