I'm making an incubator, but I'm still waiting on my fan. I am using two bulbs, if one goes out, hopefully I catch it before the second blows. I am situating my fan on the side of the cooler, blowing just under the light bulbs, with 10 mm ventilation holes to either side of the fan, and probably two directly across on the other side. Thermostat is even with the fan, and directly under and between the light bulbs. I am following this build somewhat, except I am using a digital thermostat with probe, and a low speed dc fan with an adjustable speed adapter.
https://www.backyardchickens.com/articles/how-to-make-a-cooler-incubator.73325/View attachment 2067440
Here is what I have done so far.
View attachment 2067442Tupperware with water to hold heat. A Tupperware lid for a humidity tray, and a wire hatching tray I put together. I will run a hose to the tray, out the drain plug and attatch it to a 60ml catheter syringe on the side of the cooler to raise humidity at lockdown, like so.
View attachment 2067458View attachment 2067459