I got one for my birthday, I constructed a cabinet, and I lined it with Styrofoam insulation. I mounted it at the top of the incubator, and it had great airflow. I opted for the fan 225 watt version. I put in 2 test eggs, and both have developed until hatch. My review might change if the hatch does not go well. I put in a few thermometers, and they all read the same. There was only a .2 degree different from top to bottom.