Please kindly check on the drawing which we sent to you (ps: we re- send it as attached drawing).
The fin is represented in blue rectangle as shown in my drawing sent earlier.
We have indicated the fin dimensions as 249 (H) x 130 (W) and its position should be as close to the top as possible as shown in our drawing.
On the other hand, the fin gap is 5mm, is also as shown in our drawing already.
Thank you for your kind attention. We are looking forward to hear from you soon.