Koch Multi-Pleat XL11 16 x 25 x 4 MERV 11 Pleated Air Filter - 6 Pack

The Koch Multi-Pleat XL11 is a MERV 11 extended-surface pleated filter for gas and oil furnaces, heat pumps and AC air handlers, one step up in efficiency from a standard MERV 8 filter. It fits any system that takes a 16 x 25 x 4 filter (16x25x4). This case contains 6 filters. At a typical 6–12 month change, that is three to six years of filters for one system. Multi-Pleat XL11 uses 100% mechanical filter media rated MERV 11, so its efficiency does not depend on an electrostatic charge that can fade over time. A galvanized expanded-metal support grid is laminated to the media, the pleats are bonded to the frame to prevent air bypass, and the double-wall, moisture-resistant beverage-board frame with reinforced corners stays rigid in humid conditions. Is This the Right Size? Air filters are sold by nominal size, the rounded size printed on the frame of your current filter. The filter itself is made slightly smaller so it slides into the filter slot — typically about 1/2" under nominal on length and width, and 3/4" deep for a 1" filter. Match the nominal size printed on your old filter, not a tape measurement of the slot. Not sure? Send us a photo of the label on your current filter and we will confirm the match before you order. Specifications Brand Koch Filter Series Multi-Pleat XL11 Koch Part Number 102-499-026 Nominal Size 16 x 25 x 4 MERV Rating MERV 11 (ASHRAE 52.2) Dust Spot Efficiency 45% initial | 55–60% average (ASHRAE 52.1) Media 100% mechanical media Media Support Galvanized expanded metal, laminated to media Frame Double-wall moisture-resistant beverage board, reinforced corners Quantity 6 filters What MERV 11 Captures MERV 11 captures at least 65% of particles in the 1–3 micron range and at least 85% in the 3–10 micron range under ASHRAE 52.2. That adds finer dust and pet dander to everything a MERV 8 filter stops, with only a modest increase in airflow resistance. Other Koch Options in 16 x 25 x 4 Koch Multi-Pleat XL8 16 x 25 x 4 MERV 8 Pleated Air Filter - 6 Pack Koch Multi-Pleat Green13 16 x 25 x 4 MERV 13 Pleated Air Filter - 6 Pack Replacement Schedule Check the filter monthly. Deeper filters hold far more dust than 1" filters and typically last 6–12 months, or 3–6 months in homes with pets or heavy dust. Follow your equipment manual if it calls for a different interval. Install it with the airflow arrow on the frame pointing toward the blower. In commercial systems, change the filter when pressure drop across it reaches 1.0" w.g., Koch's recommended final resistance for this filter. Shop all Koch Filter air filters.