Hi, i have smoothed the ceiling of the car and now am in the vent. I made it but mine is not as smooth as yours. I pressed smooth under shading and it made it smooth. But it became black, so i just flip direction and i got it fixed. But if i view it in object mode i still find some lines where showing. If i delete some vertice the line will disapear but it wil create an exposure. I dont have the image right now. When i get it i will post it so you can get what am saying. So please could you paste your front view of the vent so i could correct a few things.
Thanks for help and co-operation