20x25x1 Furnace Filters

Find the right 20x25x1 air filter for your HVAC. Choose MERV 8, 11, or 13 to balance airflow and allergen removal. Actual size is 19.5″×24.5″×0.75″ (industry standard). Cases of 6 ship free. Change every 60–90 days (30–60 with pets/allergies).

Choose Your 20x25x1: MERV 8 vs 11 vs 13

Balance airflow and filtration. Actual size for 20x25x1 is ~19.5x24.5x0.75.
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Feature MERV 8 Everyday Dust MERV 11 Pets & Allergies MERV 13 Max Filtration
Household dust & lint ✓ ✓ ✓
Pollen & mold spores ✓ ✓ ✓
Pet dander ✗ ✓ ✓
Smoke & smog particles ✗ ✗ ✓
Bacteria/auto emissions (fine) ✗ ✗ ✓
Recommended for Basic dust control, best airflow Homes w/ pets or allergies Maximum filtration (check system)
Note: Most systems handle MERV 11; MERV 13 may reduce airflow on older or undersized returns. When unsure, start with MERV 11 or consult an HVAC tech.
🔍 MERV 8 vs MERV 11 guide📊 Complete MERV Comparison Chart📏 Nominal vs Actual Filter Size📦 Shop 20x25x4 Filters🧭 Filter Finder
How often should I replace a 20X25X1 filter?

Most homes: every 60–90 days. With pets, allergies, or high usage: every 30–60 days. Inspect monthly and replace when the media darkens.

What is the actual size of a 20X25X1 filter?

Standard 20×25×1 filters measure about 19.5" × 24.5" × 0.75". This industry norm ensures a snug fit in 20×25×1 openings.

Which MERV should I choose for allergies or pets?

Choose MERV 11 for homes with pets or allergies. Use MERV 13 for maximum fine-particle reduction if your system supports it. MERV 8 is best for basic dust control and strongest airflow.

Will MERV 13 restrict airflow?

Many modern systems handle MERV 13, but older units or undersized returns may not. If unsure, start with MERV 11 or consult an HVAC technician.