Furnace filter · 4-inch
Aprilaire 213 (4-inch media, MERV 13)
A 4-inch whole-house media filter, true MERV 13, replaced about once a year. Deep media means high filtration with minimal airflow restriction - the technically right way to run MERV 13. Aprilaire publishes the ASHRAE 52.2 test method and a per-model static pressure drop (0.15 in. w.c. at 1200 CFM).
Bottom line
In our scoring the Aprilaire 213 (4-inch media, MERV 13) earns 6.0/10, a weak result, and it stands out on rating honesty (8.0/10). On the data, it is true MERV 13 on the ANSI/ASHRAE 52.2 scale. Replaced 1x a year it runs about $65 a year, a typical annual filter cost. Its weakest area in our scoring is total cost of ownership (3.5/10).
Where to buy
No buy link on this one: it scored Limited under our rubric, and we only link products we would shortlist ourselves.
Total cost of ownership
Checked 38 days ago- Per filter
- $64.99
- Replaced
- 1x/yr
- Annual cost
- $65/yr
Certifications
No third-party certification on an official database. Any performance claims are unverified.
Filters only protect you on their swap schedule. Get an email reminder when this one is due - one note around swap time, nothing else.
Overview
The Aprilaire 213 (4-inch media, MERV 13) is a 4-inch deep-media furnace filter rated MERV 13 on the standardized ANSI/ASHRAE 52.2 scale, which captures fine particles including smoke and many bacteria-size particles. It labels its true MERV with no proprietary scale. Its deep media keeps airflow restriction low even at this MERV. Replaced about 1 time a year, it runs roughly $65 per year.
By the numbers
- True MERV (ASHRAE 52.2)
- MERV 13
- Depth
- 4 inch (deep media, low airflow restriction)
- Captures
- fine particles including smoke and many bacteria-size particles
- Replacement cadence
- 1x per year
- Per-filter price
- $64.99
- Annual filter cost
- $65/yr
- Rating standard
- self-rated to ASHRAE 52.2 (not AHRI-certified)
Strengths
- + Rating Honesty: 8.0/10
Watch-outs
- - Total Cost of Ownership: 3.5/10
Who it is for
- · Homes targeting smoke, allergens, or fine particles (MERV 13)
- · Anyone who wants high filtration without straining the blower (deep media)
How it scored
Verified Filtration
7.0/10 · 30%True ANSI/ASHRAE 52.2 MERV - the only standardized filtration rating. Higher MERV captures finer particles.
- +7MERV 13 or higher AMERV 13 - Captures fine particles including smoke and many bacteria-size particles (MERV 13+).
Total Cost of Ownership
3.5/10 · 25%Computed annual filter cost vs the depth-class median. Cheap 1-inch filters replaced often can cost more than deep media.
- +2.5Annual filter cost vs class median A$64.99/yr (near class median) - Computed annual filter cost (price x replacements per year) scored against the depth-class median.
- +1Deep media, fewer replacements B4" media, 1x/yr - Deep media is replaced once or twice a year rather than quarterly, lowering running cost and effort.
Rating Honesty
8.0/10 · 20%Does the brand print the true MERV, or hide it behind a proprietary MPR/FPR scale? MPR/FPR is not MERV.
- +8Labels true MERV, no proprietary scale AMERV printed plainly - Uses the standardized ANSI/ASHRAE 52.2 MERV rating with no proprietary marketing scale.
Airflow Fit
6.0/10 · 15%Depth vs MERV. A high-MERV 1-inch filter restricts airflow and can strain the blower; deep media at the same MERV does not.
- +6Deep media, low airflow restriction B4" depth - Deep media has far more surface area, so even high MERV adds little airflow restriction.
Practical Fit
5.0/10 · 10%Replacement cadence and reusability. Frequent swaps are a maintenance and cost burden.
- +5Infrequent replacement B1x per year - Replaced once or twice a year, not quarterly.
FAQ
- What MERV rating is the Aprilaire 213 (4-inch media, MERV 13) really?
- Its true rating on the standardized ANSI/ASHRAE 52.2 scale is MERV 13, printed plainly with no proprietary scale.
Compared head-to-head
Related guides
This score is our opinion under our published rubric, not a statement of objective fact or a lab test of this product. We score what third-party certifications prove; absence of a certification means we found no verification, not that a product fails to perform. Last reviewed 2026-06-05. Scored under hvac-v1.0. Prices were last checked 38 days ago; the freshness chip above the cost panel shows the current state. See the methodology for how each rule fires.