Original manufacturer option
AprilAire UK213 filter and one-time upgrade rails
Filter UK213
Your search matches the manufacturer’s listed filter identifier.
Before you buy
Use the included rails when changing a listed 4-inch cabinet to this new filter. If you already installed the new rails, check the filter-only refill number instead of buying another upgrade kit. Older 2120 and 2200 cabinets need a separate setup check and are not confirmed here.
Why this filter
What’s included
The one-pack includes one TriPure filter and one-time upgrade rails. Keep the rails for future filter changes.
Size and fit
The page describes a 20 by 25 by 3-inch filter but lists kit measurements of 21.44 by 27 by 3.68 inches. These are not interchangeable size labels, and dimensions alone do not prove a fit.
Filtration rating
AprilAire labels this filter MERV 13, an air-particle capture rating. This manufacturer rating is not an independently reviewed efficiency comparison.
How this compares
This is a checked replacement, not a Best Overall or Best Value winner yet. Before choosing a winner, we need other filters we can trust, a fair comparison of how they work and how reliable they are, and current prices including shipping.
Filtration tests and details
These records explain which filter results we have checked and what their limits are. The same certification name does not mean two filters work equally well.
What we have verified about filtration
Manufacturer-supported fit does not by itself establish filtration efficiency, odor removal or superiority over another replacement. Those performance claims need their own reviewed evidence for the exact filter and equipment combination.
View sources
These sources explain the fit, features and filter test results described above. They are not retailer price checks.
Installation and care
Installing the replacement
Follow AprilAire’s upgrade instructions to install the included rails before fitting the new filter. The old 4-inch filter and the new 3-inch refill are not interchangeable without the rail change.
Where to buy
We haven’t confirmed a current price and availability for this filter. Shopping comparisons are not available yet.