Filtrete 21.5x23.5x1 AC Furnace Filter – MERV 8, MPR 700, 4-Pack (Actual Size 21.19 x 23.19 x 0.81 in)

Smart filtration for cleaner indoor air

Meet Filtrete's 21.5x23.5x1 AC Furnace Air Filter, a 4-pack designed to keep your home's air moving cleanly through each cycle of your heating or cooling system. Built with electrostatic filtration, these pleated filters attract and trap a broad range of particles as air passes through, from visible dust to tiny particles that swirl in everyday rooms.

What sets this filter apart is the combination of 3M's exclusive 3-in-1 technology with a practical MPR 700 and MERV 8 rating. Higher ratings mean more particles are captured without choking airflow, so your system can breathe easy while your living spaces feel fresher. The filter is designed to fit standard actual size 21.19 x 23.19 x 0.81 in and is compatible with many furnace and air conditioning setups.

• Electrostatic filtration attracts and traps lint, pollen, dust, and pet dander
• Higher MPR and MERV ratings indicate a broader particle capture while preserving airflow

Designed for busy households, the 4-pack means you can plan a routine replacement every 3 months. The product also offers a handy change countdown via the Filtrete Smart App: scan, set a reminder for 30, 60, or 90 days, and receive a notification when it's time to swap. This helps you stay on top of maintenance without guesswork.

In real-world use, you may notice reduced surface dust on furniture and electronics and a more consistent airflow during peak indoor seasons. While not a medical claim, better filtration can contribute to a more comfortable living environment where air feels crisper and surfaces stay cleaner.

Key benefits at a glance

• Electrostatic filtration attracts and traps lint, pollen, dust, and pet dander
• Higher MPR and MERV ratings indicate broader particle capture while preserving airflow
• 3-in-1 Filtrete technology combines filtration with airflow efficiency
• 4-pack provides ongoing replacement every 3 months
• Smart App countdown helps you schedule changes with reminders
• Designed to outperform non-electrostatic, non-pleated and washable filters

Whether you’re aiming for less dust on surfaces, a more consistent climate, or simply a straightforward maintenance routine, this Filtrete filter is built to work with your home’s system while keeping installation simple and fast.