Installed large computer fan

Here is my ceiling fan @ the vent installed today. It slides to allow the crank to close the vent. The white track allows the fan to glide out of the way. I have snap on clips to keep it from moving during travel stop and go's.
In this top photo, the fan stops just at the handle actually centering the fan as seen.
Haven't got it hooked up yet and it runs off 12 volt. Think this will help?

In this top photo, the fan stops just at the handle actually centering the fan as seen.

Haven't got it hooked up yet and it runs off 12 volt. Think this will help?