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Refrigerator Filters
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Water Filters
18 x 30 x 1 Air Filters
This 18x30x1 air filter is the 3M Filtrete 1000 Micro Allergen, sold in a 4-pack and rated MERV 11 on 3M's MPR-to-MERV chart. Filtrete recommends changing 1-inch filters at least every 3 months, so one pack covers about a year.
Specs
The Filtrete 1000 18x30x1 is a 1-inch filter with an MPR 1000 rating, which 3M's conversion chart lists as MERV 11.
- Size: 18 x 30 x 1 (nominal)
- Rating: MPR 1000 / MERV 11
- Pack: 4 filters
Order the exact size shown on your old filter. For other sizes, see air filters by size or use our air filter finder.
Common questions
What MERV is Filtrete 1000?
The Filtrete 1000 is MERV 11. 3M rates its Filtrete filters in MPR, and the company's conversion chart lists MPR 1000 as MERV 11 on the industry MERV scale.
How often should you change an 18x30x1 filter?
An 18x30x1 filter should be changed at least every 3 months, according to Filtrete. Note the install date on the filter frame so you know when the next change is due.
