12×24×4Air Filter
Fits any 12x24x4 slot or return grille. Order by the size printed on your old filter.Also sold as 24x12x4.
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Common questions about 12x24x4
What is the actual size of a 12x24x4 filter?+
The nominal size printed on the frame is 12x24x4, but the filter actually measures 11.375" × 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 12x24x4?+
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 12x24x4 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.
Is a 24x12x4 the same as a 12x24x4?+
Yes, 12x24x4 and 24x12x4 are the same filter; the dimensions are just written in a different order. This filter fits both.