AprilAire UK311 MERV 11 TriPure Air Filter with Upgrade Rails 20x20x3

The AprilAire UK311 is a MERV 11 TriPure media air filter with one-time upgrade rails. It is the direct replacement for the AprilAire 310 whole-house air cleaner filter. The nominal size is 20 x 20 x 3 inches. It works as a replacement HVAC media filter for compatible AprilAire air purifier cabinets.

Key Features:

• MERV 11 filtration: Removes up to 92% of household dust, pollen, and common allergens such as mold spores, pet dander, and lint.
• TriPure Technology: The 3-inch pleated media is made of synthetic fiber.
• Upgrade rails included: The one-time rails slide into place without tools. They make later filter changes easier.
• Energy efficient: Airflow resistance is up to 30% lower than leading brands.
• Long filter life: Each filter lasts up to 12 months.
• Actual size: About 20.61 x 21.75 x 3.68 inches.
• Made in the USA by Research Products Corporation.

The UK311 replaces the AprilAire 310 filter. It is designed to fit AprilAire air cleaner models including 1310, 2310, 3310, 4300, U131, and U233. The filter and rails ship together for a correct fit.