what if you moved it over to the right some that way a little bit will but where the window part is but not fully and it wont be covering the vent hole?
if it were me i wouldn't worry about covering the vent hole since it will be a force air
Put it right there an if needed plug that vent. It wont hurt a thing. Still air needs more ventilation for the air to flow right. Forced air ant as reliant on where the vents are.
I added my fan right in the center covering the vent hole. I also have the fan blowing down on the eggs. I had great results 10 of 11. I have pics if u want me to email them to u of the fan. It was great stablizing the temps and humidity. Good luck.