4-Inch Pleated● Shipping included

24×24×4Air Filter

Actual size: 23.375″ × 23.375″ × 3.75″
Fits any 24x24x4 slot or return grille. Order by the size printed on your old filter.

Case of 12
Shipping included
Picked by HVAC techs

Choose your protection level

24x24x4 · MERV 11

$260.99per case of 12, shipping included

About $21.75 a filter. Kentucky orders add 6% sales tax.

1 case, 12 filters1

Want a new case every year? A yearly subscription is available at checkout.

MERV 11 · Case of 12

$260.99

Common questions about 24x24x4

What is the actual size of a 24x24x4 filter?+

The nominal size printed on the frame is 24x24x4, but the filter actually measures 23.375" × 23.375" × 3.75". That undercut is intentional: it slides into your filter track without binding. Order by the nominal size printed on your old filter.

Which MERV rating should I pick for a 24x24x4?+

MERV 8 handles everyday dust. MERV 11 is our most popular. It captures pet dander and pollen. MERV 13 adds smoke and the finest everyday particles. When in doubt, call us. A real HVAC tech answers. Compare MERV 8, 11 and 13.

How often should I change a 24x24x4 filter?+

Deep-pleat media filters like this 4-inch typically last 6-12 months. Check it at each season change. See the schedule by household type.