Volvo VNL 780 Operator's Manual page 166

156 INSTRUMENTS AND CONTROLS
The vent also opens toward the front or toward the rear. This can be used for forcing air into
the cab (open toward the front) or for venting air out of the cab (open toward the rear).
CAUTION
The vent should not be used during
rain, while washing the vehicle or other
circumstances where water may enter the
cab while the vent is open. To prevent
leaks, make sure the handle rollers are on
the top center part of the cams.
Earlier production versions of the VN 780 are equipped with four hinged side windows in
the sleeper area. Later production versions have two hinged side windows in the sleeper
area and two upper vent windows.
Earlier production versions of the VN 670 have only the two upper windows. Later
production versions have two upper vent windows.