What are air vent filters made of?

Air vent filters are typically made from materials such as fiberglass, pleated synthetic fibers, or foam. Fiberglass filters are inexpensive and effective at trapping larger particles, while pleated filters offer a greater surface area for improved filtration of smaller particles. Foam filters are often used in reusable applications due to their washable nature. The choice of material impacts the filter's efficiency, lifespan, and application suitability.