Filtrete 18x20x1 AC Furnace Air Filter – MERV 11, MPR 1000, 3-Month Pleated, 2-Pack

Create a cleaner, fresher home environment with Filtrete 18x20x1 AC Furnace Air Filter. This 2-pack uses a pleated 1-inch design with a MERV 11 rating and MPR 1000, and its actual size is 17.81 x 19.81 x 0.81 inches.

Why choose Filtrete 18x20x1

• Exclusive Filtrete 3-in-1 technology pulls in and traps a broad range of particles, allowing cleaner air to flow through.
• With a 1000 MPR and MERV 11 rating, it helps capture microparticles like pet dander, smoke and smog, while also catching large particles such as pollen and household dust.
• Certified asthma and allergy-friendly, this filter is designed to reduce common airborne irritants in your living spaces.
• The 3-month pleated design balances performance with convenience; replace every 90 days for best results.
• Versatile compatibility fits furnaces, air conditioners, or HVAC systems that use 18x20x1 filters.
• Use the Filtrete Smart App to set 30-, 60-, or 90-day replacement reminders and receive alerts when it’s time to change.

Real-life use and maintenance tips

In everyday rooms, this filter works quietly in the furnace or air handler, helping air move through more smoothly when it's time for a change. A 2-pack ensures you’ve got a spare on hand so you can swap in a fresh filter without rushing.

• Easy installation with standard 18x20x1 frames; align edges and snap into place for a snug fit.
• Two-pack convenience means you’re prepared for the next replacement cycle, reducing last-minute shopping.
• To maintain airflow and efficiency, check the filter every month and replace on or before the 90-day mark.

Tips to maximize performance

• Mark the replacement date and follow the 90-day schedule, especially during high-usage seasons.
• Keep vents and return air paths clear of obstructions to support steady airflow.
• Scan the filter barcode with the Filtrete Smart App to set reminders and track replacements.