A car cabin filter, also known as an interior air filter, is a component of a car’s heating, ventilation, and air conditioning (HVAC) system. It removes contaminants, such as dust, pollen, and other particles, from the air that enters the passenger compartment. A clean cabin filter helps improve air quality inside the vehicle, making the ride more comfortable and reducing the risk of allergies or other respiratory problems. Cabin filters are typically replaced periodically as part of routine car maintenance and are located behind the glove box or under the hood.