Hello? Arttystation. Thank you for your interest in our Arttystation products and for leaving your inquiry.
The diameter of the rear exhaust port of the OPERA-06 product that you inquired about is 150mm instead of 110mm ^^; In the past, Version 1 used 100mm pipe size, but it was changed to 150mm when it was upgraded to Version2.
Therefore, if you want to use a 75mm fan, you can change the pipe size using a gender (also called a reducer) that changes 150mm to a 75mm pipe size.
If you have any questions during the process or if you have any further questions, please feel free to contact us ^^ Thank you!
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Arttystation
Thank you for your interest in our Arttystation products and for leaving your inquiry.
The diameter of the rear exhaust port of the OPERA-06 product that you inquired about is 150mm instead of 110mm ^^;
In the past, Version 1 used 100mm pipe size, but it was changed to 150mm when it was upgraded to Version2.
Therefore, if you want to use a 75mm fan, you can change the pipe size using a gender (also called a reducer) that changes 150mm to a 75mm pipe size.
If you have any questions during the process or if you have any further questions, please feel free to contact us ^^
Thank you!