Aerostar Series 400 Pleated Furnace Air Filter 20x20x4 MERV 8 Standard Capacity

The Aerostar Series 400 pleated furnace air filter is designed to improve indoor air quality while maintaining efficient airflow throughout your HVAC system. Built with advanced 100% synthetic filter media, it effectively captures airborne particles including dust, pollen, mold spores, lint, and pet dander to help create a cleaner and healthier indoor environment.

Featuring a MERV 8 efficiency rating, this 4-inch pleated air filter provides increased dust-holding capacity and longer service life compared to standard 1-inch filters. Its durable construction helps maintain stable airflow, supports HVAC efficiency, and protects coils, ductwork, and other system components from dust and debris buildup.

Suitable for residential, commercial, and light industrial HVAC applications, this 20x20x4 furnace filter is designed for systems requiring deeper filter capacity and should be replaced based on usage, indoor air quality, and environmental factors such as pets, allergies, and seasonal dust levels.