16x20x4 Air Filters | MERV 8, 11, 13 | Actual Size 15.375x19.375x3.625 | Free Shipping

Find the right 16x20x4 air filter for your HVAC. Choose MERV 8, 11, or 13 to balance airflow 
and allergen removal. Actual size is 15.5" x 19.5" x 3.625" (industry standard). Cases of 6 ship 
free. Change every 6-10 days (4-6 or as needed for high dust and allergens).

💰 Why pay more at Home Depot, Lowes, or Costco? Get premium 16x20x1 filters at wholesale 
prices - save 30% with our 3-pack bundles. Same quality, better price, delivered free.

Choose Your 16X20X4: MERV 8 vs 11 vs 13

Balance airflow and filtration.
Free Shipping Fast Dispatch Made in USA Media Subscribe & Save
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, strong airflow Homes w/ pets or allergies Maximum filtration (check system)
How often should I replace a 16X20X4 filter?

Typical usage: every 6–12 months. With pets, allergies, or heavy HVAC use: every 3–6 months. Inspect quarterly.

What is the actual size of a 16X20X4 filter?

Most 4-inch filters measure about 15.5x19.5x3.625. This ensures a proper fit in nominal 16X20X4 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 in 4-inch filters?

4-inch media offers more surface area, so most systems handle MERV 13. If returns are undersized or older equipment struggles, try MERV 11.