I still say just bash a random huge hole in the ceiling , think about it......
it fixes your issue and allows a steady swap of stale for fresh air, no need to worry about static pressure and all that fancy jazz
It costs nothing at all iin fact you'll gain a piece or tow of 2x4', small piece of drywall some insulation , screws and even a shingle or two from the demo.......that's a plus in my books.
It hasn't got to be pretty if you don't have a saw just bash a hole down with your foot it's in your fish room so doesn't need to be pretty .
Come winter temps will stay low and chiller runs less and come summer heaters will run less
Your carbon footprint will be small and more money for corals wi all the power savings
No need for mechanical failures works 24/7 flawlessly
If you create a sheet and weigh the pros vs cons you'll find this is the way to go by far , you should take my work for it I have a lot of posts so it has to be true
Really the only other better alternative is to cut two holes in your roof
