In automobiles, vent glass, also known as vent windows or quarter glass, refers to the small windows typically positioned near the front or rear side windows of a vehicle. These windows were originally designed to improve airflow and provide additional ventilation before air conditioning became a standard feature in cars.

Although their primary purpose was once functional, vent glass has evolved over time and now serves several purposes in modern vehicles:

• Aesthetic Design: Many manufacturers use vent glass to enhance the overall styling and sleekness of a vehicle’s profile.

• Improved Functionality: In some vehicles, vent glass is integrated to allow the rear side windows to roll down further, offering more airflow and convenience for passengers.

• Fixed or Operable: Vent glass can either be stationary or operable. In older models, operable vent windows could tilt open to allow fresh air into the cabin.

• Strategic Placement: These windows are commonly located in front or rear doors, often near the A-pillar (front of the vehicle) or C-pillar (toward the back).

While vent glass may no longer be as common as it once was, it still remains a distinctive feature in vehicle design, combining both form and function.