24x24x4 Air Filters
24x24x4 is 4" commercial air-handler racks for longer filter life. It is available in MERV 8, MERV 11, and MERV 13 (deep media keeps airflow resistance low even at MERV 13). A 24x24x4 pleated filter typically lasts 6 months. The 24x24x4 label is the nominal size; the actual filter measures about 23.5 x 23.5 x 3.75 inches.
About the 24x24x4 air filter
The 24x24x4 air filter is used in 4" commercial air-handler racks for longer filter life. As with all air filters, the size is given as length x width x depth in inches. The 24x24x4 label is the nominal size; the actual filter measures about 23.5 x 23.5 x 3.75 inches.
If your system uses 24x24x4, you can choose the efficiency that fits your needs — from basic equipment protection up to MERV 13 for allergies, pets, and wildfire smoke. Because this is a deep-media filter, you get high efficiency with low airflow resistance and a long service life.
24x24x4 MERV options
| MERV | Captures | Best for |
|---|---|---|
| MERV 8 | Dust, lint, pollen | Basic protection |
| MERV 11 | Above + pet dander, fine dust | Pets, mild allergies |
| MERV 13 | Above + smoke, bacteria | Allergies, asthma, smoke |
When to replace a 24x24x4 filter
A 24x24x4 (4") filter typically lasts 6 months. Replace it sooner if you have pets, allergies, or during wildfire smoke season. Hold it up to light — if you can't see through the media, it's time to change it.
Frequently Asked Questions
What systems use a 24x24x4 air filter?
24x24x4 is used in 4" commercial air-handler racks for longer filter life. Check the size printed on the side of your current filter to confirm before ordering.
What is the actual size of a 24x24x4 filter?
The 24x24x4 label is the nominal size; the actual filter measures about 23.5 x 23.5 x 3.75 inches. Always order by the nominal size (24x24x4) for standard filters.
Can I get a 24x24x4 filter in MERV 13?
Yes. 24x24x4 is available in MERV 13 pleated for maximum particle capture, as well as MERV 8 and MERV 11. Custom efficiencies and frames are also available.
How often should I replace a 24x24x4 filter?
Typically every 6 months, and more often with pets, allergies, or during smoke season.
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Need help choosing the right filter?
Talk to our Canadian air filtration team. Call 1-888-973-3635 or request a quote.