Surprise, Surprise, Really

Unobstructed access?

It was all I could do to reach around with the camera to take a photo, so horizontal venting in a concealed location?

Just because it fits does not mean it's up to code. This is one tight attic. Heat only system has two supply air registers (14x8 master bed rm and 12x6 bath rm) and I am called out because the owner wants to add air conditioning. Really?