Rheem-Ruud PD540042 MERV8 Media Filter 21X21X0.5"

The Rheem-Ruud PD540042 MERV 8 Media Filter is an essential part of the HVAC system and if well installed, it will enhance performance and well indoor air quality. White, 3/4” filter designed to fit standard HVAC systems and is conveniently replaceable. This media filter works in a way that it retains dust, pollen, pet dander and other irritants that may be airborne within your house. It has a MERV 8 rating which explains how effectively it captures particles of a given size thus offering a compromise between filtering and allowing air to flow through.