Honda 1999 Odyssey Owner's Manual page 133

Heating and Cooling
Vent Controls
CENTER VENTS
You can adjust the direction of the
air coming from the dashboard vents
by moving the tab in the center of
each vent up-and-down and side-to-
side.
Comfort and Convenience Features
CORNER VENT
The vents in the corners of the
dashboard can be opened and closed
with the dials next to them.
REAR CEILING VENT
There are four vents in the ceiling
(see page 148).