Whole-Home Media● In stock
21.5×26×4Air Filter
Actual size: 21.5″ × 26″ × 3.63″
Exact-cut OEM size, the printed size is the true size.Also sold as 26x21.5x4.
Exact-cut OEM size, the printed size is the true size.Also sold as 26x21.5x4.
Fits Carrier EXPXX variants
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- Picked by HVAC techs
Choose your protection level
Pack size (bigger packs save more)
21.5x26x4 · MERV 11 · 2-Pack$75.98$69.99
Or subscribe: $25.99/filter delivered, never think about it againMERV 11 · 2-Pack
$69.99
Common questions about 21.5x26x4
What is the actual size of a 21.5x26x4 filter?+
21.5x26x4 is an exact-cut size: it measures a true 21.5" × 26" × 3.63". It's made for specific OEM return grilles.
Which MERV rating should I pick for a 21.5x26x4?+
MERV 8 handles everyday dust. MERV 11 is our most popular, it captures pet dander and pollen. MERV 13 adds smoke, bacteria, and virus-carrier capture. When in doubt, call us, a real HVAC tech answers.
How often should I change a 21.5x26x4 filter?+
Deep-pleat media filters like this 4-inch typically last 6-12 months. Check it at each season change.
Is a 26x21.5x4 the same as a 21.5x26x4?+
Yes, 21.5x26x4 and 26x21.5x4 are the same filter; the dimensions are just written in a different order. This filter fits both.
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