Koch Air Filter 16 x 20 x 4 MERV 11 Multi-Pleat XL11 Pleated Air Filter - 6 Pack

The Koch Multi-Pleat XL11 is a MERV 11 pleated replacement filter for gas and oil furnaces, heat pumps, and AC air handlers that use a 16 x 20 x 4 filter. Model 102-499-025. Actual dimensions are 15½" × 19½" × 3¾" — nominal 16 x 20 x 4.

This is a direct upgrade path from MERV 6 and MERV 7 pleated filters currently in service, with minimal increase in airflow resistance and measurable improvement in particulate capture efficiency.

Filter Media & Construction

The XL11 uses a 100% non-woven synthetic media manufactured from recycled material. The media is hydrophobic — it does not absorb moisture — and maintains performance in high-humidity environments where paper-based or cellulose media degrades. MERV 11 efficiency is achieved with low resistance to airflow, making it suitable for systems not designed for high-static filters.

The V-pleat design maximizes surface area within the 4" depth. Diamond-shaped expanded metal media support prevents pleat collapse under sustained airflow. The filter media pack is sealed to the frame to eliminate air bypass. The moisture-resistant clay-coated frame is also manufactured from recycled material.

Specifications

MERV 11 — What It Captures

MERV 11 filters capture particles in the 1.0–3.0 µm range at 65%+ efficiency and particles in the 3.0–10.0 µm range at 85%+ efficiency. This includes fine dust, pollen, mold spores, pet dander, and some bacteria-carrying particles. It is a meaningful step up from MERV 6–7 filters without the high static pressure drop of MERV 13+ filters that can strain residential HVAC equipment.

Availability note: This item ships from stock when available. Larger quantities may require additional lead time. If you need a confirmed ship date before ordering, contact us and we will verify current stock prior to your purchase.