How to read an air filter size
The size is printed on the edge of the filter as width × height × depth in inches, for example 16 × 25 × 1. Buy that exact size.
- Example
- 16 × 25 × 1 inches
- Where it is printed
- On the cardboard edge of the old filter
- Arrow
- Points toward the furnace, in the direction the air flows
Nominal and actual size
The big numbers are a rounded size; the true size is often a little smaller and printed in small type. Both mean the same filter.
MERV rating
MERV is how fine the filter is. Higher catches smaller dust but can strain some systems; check your furnace manual for the highest rating it accepts.
Step by step: replace a furnace filter
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General guidance for this kind of product, written by Sureno. Check your own model’s manual too.
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