Koch Air Filter 16 x 20 x 4 MERV 11 Multi Pleat XL11 Pleated Air Filter 6 Pack ICRA Compliance Filters supports MERV 4 5 filters label__Ships in 1 to 3 Days supports MERV 4 5 filters This enhanced surface structure captures fine dust more effectively than conventional flat filters—helping reduce odors The XL11 uses a 100% non woven synthetic media manufactured from recycled material Model Number 102 499 025 Nominal Size 16 x 20 x 4 Actual Size 15½" × 19½" × 3¾" MERV Rating 11 Media 100% non woven synthetic hydrophobic recycled material Media Support Diamond shaped expanded metal Pleat Design V pleat Frame Moisture resistant clay coated recycled material Listing UL 900 Class 2 Pack Quantity 6 filters Replace Every 3 months (check monthly) MERV 11 — What It Captures