A cab for a vehicle has an inset mesh screens along opposite side walls that define window openings through which an operator can view the surroundings, and the window opening is covered with a window assembly including a sliding window panel. The sliding window panel has a latch member that extends through a slot in the mesh screen, and a spring loaded knob that will seat in detents in the mesh screen at selected positions along the slot. The spring loaded knob is on the interior of the cab and is secured in place. The inset of the mesh screen forms a recessed receptacle for the window assembly so window panels of the window assembly do not project outwardly beyond the side surfaces of the cab.