This image of your thermo fan:
ebay special? And what size is it? I've got two 7 inch thermos and a 9 inch on Ruby Scoo, a tight fit but they work well so far. I wouldn't bother with the 7 inch fans again, I reckon two 10 inch units would have done the job well and cleared the front of the EJ - which is the biggest issue I have...
Cheers
Bennie