tronyony

1500 mm !

And you need to make holes in the top (50 mm * 50 mm) so that you can fit into some 50mm fans that can blow air into the tube and out through the open sides. Do you use 3 fans then you probably also need to do some ventilation openings on the top between fan 1 and 2 and between fan 2 and 3

Sincerely Lasse

No - i´m sorry I wrote in a bad way. I mean 25 mm * 50 mm -> 2,5 cm * 5 cm

Sincerely Lasse

Will do, thank you. Have fun with the Bull Sharks!

As I am in Thailand diving with Bull Sharks I have a hard time answering your question in a good way, the Internet is way to slow and laggy. But, if you put this question into the general thread or PM Lassef (on this forum) you will get good help.