Why it matters
The True Blue Allergen MERV 11 Air Filter is a pleated furnace and air conditioner filter rated MERV 11. Its size table lists 1 sizes in 1-inch depths, each linked to its own listing.
Sizes by depth: 1-inch: 1 sizes (from 25x25x1 to 25x25x1).
MERV 11 is the usual allergy upgrade: it catches most pollen, pet dander and mold spores, and part of the 1 to 3 micron range.
The listing sells it as 4 filters per pack; the material is fiberglass, metal.
Replacement interval stated by the seller: 4 months.
The True Blue listing names made in the USA, electrostatically charged media and 4 filters per box.
Who it's for, and who should skip it
Good fit if
- Allergy households
- Homes that change filters on schedule
Look elsewhere if
- Smoke or fine-particle control
Sizes and where to buy each
Each size below links to that exact size; check the nominal size printed on the frame of the filter you have now.
| Size | Buy this size |
|---|---|
| 25x25x1 | Amazon |
Sizes are nominal (the label size); actual dimensions are usually about 1/4 to 1/2 inch smaller so the filter slides into the slot.
Pros and cons
Pros
- MERV 11
- 1 sizes listed
- 4 Count per pack
Cons
- Measure your slot: nominal and actual sizes differ
Limitations to weigh
- Specifications are the maker's or seller's own figures; check fit against your equipment's model number and the actual size.
Specifications
The bracket shows where each figure comes from.
| MERV rating | 11 | Retailer |
|---|---|---|
| Compatible devices | Air Conditioner, Furnace, Heat Pump | Retailer |
| Dimensions (seller) | 20"L x 15"W x 1"Th | Retailer |
| Product weight | 1.95 pounds | Retailer |
| Unit count | 4 Count | Retailer |
| Material | Fiberglass, Metal | Retailer |
| Model number | 315201.4 | Retailer |
| Replacement interval | 4 months | Retailer |
Alternatives worth comparing
More hvac and furnace filters we cover
Final verdict
A solid choice for allergy households. Check the size table and order the exact size on your old filter's frame.
Where to buy
Each button opens this exact model. We may earn a commission on tracked links; it never changes what we publish. Disclosure