Resideo FC40R1185 18"X18"X4" Return Grille Media Air Filter

The Resideo FC40R1185 18" x 18" x 4" Return Grille Media Air Filter is a must have to help improve air quality in HVAC systems. This high efficiency air cleaner filter is 18" tall, 18" long and 4" wide and is designed for common return grille openings in residential and commercial settings. And that consists of capturing airborne particles, dust, pollen, and all that stuff when they go through the HVAC system. The design of these particles is such that they will caught by the filter medium, and the filter medium will not use the particles to flow through the system and keep the air in the system cleaner.