A vent filter is a device used to remove particles and contaminants from the air before it is released into the atmosphere or circulated throughout a building. Vent filters can help improve indoor air quality by trapping dust, pollen, and other allergens, as well as preventing the spread of bacteria and viruses. They are commonly used in HVAC systems, air purifiers, and industrial ventilation systems. Regularly changing or cleaning the vent filter is essential to maintain its effectiveness and prolong the lifespan of the equipment.