18×24×1Air Filter
Fits any 18x24x1 slot or return grille. Order by the size printed on your old filter.Also sold as 24x18x1.
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- Picked by HVAC techs
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We do not have an online price for this size yet. Call us, or send the form below, and we will get you a price.
Call (270) 534-5492Or get a price by email
Common questions about 18x24x1
What is the actual size of a 18x24x1 filter?+
The nominal size printed on the frame is 18x24x1, but the filter actually measures 17.5" × 23.5" × 0.75". 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 18x24x1?+
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, and it's fine in modern systems (post-1995 blowers). When in doubt, call us. A real HVAC tech answers. Compare MERV 8, 11 and 13.
How often should I change a 18x24x1 filter?+
Every 30 to 90 days: monthly with multiple pets or allergies, every 60 days with one pet, every 90 days otherwise. See the schedule by household type.
Is a 24x18x1 the same as a 18x24x1?+
Yes, 18x24x1 and 24x18x1 are the same filter; the dimensions are just written in a different order. This filter fits both.