I have just completed my DIY incubator. the heating compartment at the top is 36"X12" with a 500W baseboard heater. I have 3"ABS pipes down each side from top to bottom. A bathroom vent fan blows down one pipe and air circulates back up the other. Just checking on good placement of vent holes for air intake and out venting.. Any Ideas? As you can see I have two 1/2" holes near the bottom of the heating compartment on the fan side for air intake and numerous others in the incubation compartment for opening for air in/out.