Lennox Model PMAC-12C Air Cleaner Filter Media – X0444 (2-Pack) FEATURES: Expandable media air filter – ships like a collapsed accordian and is expanded into existing frame. Genuime OEM Lennox Par #0444 Factory original BMAC Healthy Climate Media Electrostatically charged disposable media Captures dust mites, pollen, mold spores, pet dander and other contaminants down to 0.3 microns Synthetic media offers large surface area for maximum dirt holding capacities with minimum air resistance Media is certified to UL 900 standard. UL classification – Class 2 Replace every 6 months under normal use SPECIFICATIONS: MERV 10 Same as Aprilaire 2400, 401