Original manufacturer option
AprilAire U1213 legacy cabinet upgrade kit
Filter U1213
Your search matches the manufacturer’s listed filter identifier.
Before you buy
For an original 2120 or 2200 cabinet still using its 201 inner housing, use the complete conversion kit. If the cabinet has already been converted, check its current filter label before buying another kit. U1213 and UK213 are different upgrade kits.
Why this filter
What’s included
The box includes one 3F213 filter, four frame supports, two frame bases, a door liner, a door label and instructions. The supports and bases stay in the cabinet for future filter changes.
Size and fit
The page describes a 20 by 25 by 3-inch filter and lists the complete kit at 21.07 by 25.24 by 5.19 inches. Filter size and kit size describe different things; dimensions alone do not confirm a fit.
Filtration rating
AprilAire labels the included filter MERV 13, an air-particle capture rating. This is a manufacturer rating, not an independently reviewed 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 the included conversion instructions to replace the old inner housing and fit the supports, bases and door liner. Do not put the new filter into the old housing without the conversion.
Where to buy
We haven’t confirmed a current price and availability for this filter. Shopping comparisons are not available yet.