3M Filtrete Allergen Defense Air Filter

A MERV 11 rating indicates that this filter is highly effective at capturing smaller particles like pet dander, smoke, and smog, in addition to larger debris like dust and lint. It strikes a strong balance between high-level filtration and maintaining proper airflow for your HVAC system.

No, this is a disposable electrostatic filter. Washing it will damage the electrostatic fibers and significantly reduce its ability to capture allergens, so it should be discarded and replaced every 90 days.

The pleated design is engineered to maximize surface area, which helps maintain consistent airflow even while trapping microscopic particles. However, it is important to replace the filter every three months to prevent buildup that could cause your system to overwork.

This filter fits standard 20x25x1 inch slots commonly found in most residential HVAC systems. Always double-check your current filter's dimensions to ensure a proper fit before purchasing.

Unlike basic fiberglass filters that rely solely on physical barriers, this filter uses an electrostatic charge to actively attract and trap microscopic particles like pollen and smoke. This allows it to capture smaller irritants that standard filters often let pass through.