Acura 3.5 RL Manual page 957

Dashboard
Component Removal/Installation
(cont'd)
Side air vent (passenger's):
Insert a flat metal plate under the clips, then detach the
clips by prying up. Pull the side air vent backward while
prying the clips.
Side defogger trim:
Carefully pry the side defogger trim at the rear edge,
then remove it.