The 13x21-1/2x1 MERV 11 HVAC air filter is manufactured for excellent filtration to block and capture allergens, pollen, and other particles while maintaining a low-pressure drop. The MERV 11 AC filters deliver a stronger, more efficient, and more effective filtration application for your HVAC system than standard pleated air filters assuring overall outstanding performance. These filters have a MERV 11 rating per ASHRAE Test Standards of 52.2. Applications, where these filters are most suitable, include residential, commercial office buildings, hospital settings, laboratories, and a wide array of other industrial facilities where maintenance personnel or homeowners require an increased level of cleaner air quality. The filter is constructed with a sturdy water-resistant beverage board frame with wire-supported media. The MERV 11, MPR 1000, FPR 8 rated filter is composed of an electrostatic blend of synthetic fibers allowing for optimal air filtration making this an ideal filter for your facilities' requirements. All filters are made in the USA. Replaces Bryant, Carrier, and Payne air filters for part numbers: FV4, FK4, FC4, FB4, FA4, FH4, FA48NF048, FA4ANF042, FA4BNC042, FA4BNC048, FA4BNF042, FA4CNC042, FB4ANF048, FC4BNB054, FC4BNF042, FC4CNF048, FK4CNF003, FK4DNF005, FV4ANF003, FV4ANF005, FV4BNF003, FX4BNF042, FX4CNF042, FX4CNF048, FYANF042, KFAFK0312LRG.

• EXACT DIMENSIONS: 13 x 21-1/2 x 3/4 NOMINAL SIZE: 13 x 21-1/2 x 1 BLOCKS, FILTERS, ATTRACTS particles such as allergens, pet dander, pollen, dust, bacteria, smoke, mold spores and smog.
• MERV 11, MPR 1000, FPR 8 filtration performance rating designed to filter microscopic particles, but still allows cleaner air flow to go through.
• UPGRADE & EXCEEDS fiberglass, washable, and non-electrostatic air filters. Simple to install and recommended to replace every 60-90 days for best results with your heating & AC cooling system or HVAC system.
• STRONGER DUAL SIDE CONSTRUCTION for commercial, home, and industrial applications. Dual beverage board frame will not buckle in tougher than normal conditions.
• MANUFACTURED IN USA. Available in 1, 2 ", and 4' depths with large variety of sizes. Inexpensive quality replacements for Carrier, Bryant & Payne 1' filters.