20x20x1 Furnace Filters

20x20x1 air filters — furnace and AC filters in MERV 8, MERV 11 and MERV 13. Made in the USA, ships same day before 11:30 AM EST.

Why buy your 20x20x1 filters from Atomic
Guaranteed Fit
Actual size
19.5″ × 19.5″ × 0.75″
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Every order, lower 48
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Order by 11:30 AM EST
1 day to most of East Coast
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Made in the USA
✓ Sold by the case — a year of filter changes in one order, no reordering

Choose Your 20x20x1: MERV 8 vs 11 vs 13

Balance airflow and filtration.
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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 matching depth (e.g., 20x20x4)🧭 Filter Finder
What is the actual size of a 20X20X1 filter?

Standard 20X20X1 filters measure about 19.5" × 19.5" × 0.75". This industry norm ensures a snug fit in 20X20X1 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.