Furnace filter · 5-inch
Lennox Healthy Climate X6673 (5-inch media, MERV 11)
A 5-inch OEM media filter, true MERV 11 (confirmed against Lennox spec bulletin 210450; the X-series also sells MERV 13/16 cartridges, so confirm the part). Deep media gives low airflow restriction and roughly yearly replacement.
Bottom line
In our scoring the Lennox Healthy Climate X6673 (5-inch media, MERV 11) earns 6.0/10, a weak result, and it stands out on rating honesty (8.0/10). On the data, it is true MERV 11 on the ANSI/ASHRAE 52.2 scale. Replaced 1x a year it runs about $36 a year, a typical annual filter cost. Its weakest area in our scoring is verified filtration (5.0/10).
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
- $35.98
- Replaced
- 1x/yr
- Annual cost
- $36/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 Lennox Healthy Climate X6673 (5-inch media, MERV 11) is a 5-inch deep-media furnace filter rated MERV 11 on the standardized ANSI/ASHRAE 52.2 scale, which captures fine dust, pollen, and pet dander. 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 $36 per year.
By the numbers
- True MERV (ASHRAE 52.2)
- MERV 11
- Depth
- 5 inch (deep media, low airflow restriction)
- Captures
- fine dust, pollen, and pet dander
- Replacement cadence
- 1x per year
- Per-filter price
- $35.98
- Annual filter cost
- $36/yr
- Rating standard
- self-rated to ASHRAE 52.2 (not AHRI-certified)
Strengths
- + Rating Honesty: 8.0/10
Watch-outs
- No significant weaknesses flagged.
Who it is for
- · Allergy and pet households wanting strong everyday filtration (MERV 11-12)
- · Anyone who wants high filtration without straining the blower (deep media)
How it scored
Verified Filtration
5.0/10 · 30%True ANSI/ASHRAE 52.2 MERV - the only standardized filtration rating. Higher MERV captures finer particles.
- +5MERV 11-12 AMERV 11 - Captures fine dust, pollen, and pet dander well (MERV 11-12).
Total Cost of Ownership
6.0/10 · 25%Computed annual filter cost vs the depth-class median. Cheap 1-inch filters replaced often can cost more than deep media.
- +5Annual filter cost vs class median A$35.98/yr (below class median) - Computed annual filter cost (price x replacements per year) scored against the depth-class median.
- +1Deep media, fewer replacements B5" 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 B5" depth - Deep media has far more surface area, so even high MERV adds little airflow restriction.
- ·Pressure drop not published Cno initial-resistance figure - The manufacturer publishes no initial-resistance figure; airflow impact is inferred from depth and MERV.
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 Lennox Healthy Climate X6673 (5-inch media, MERV 11) really?
- Its true rating on the standardized ANSI/ASHRAE 52.2 scale is MERV 11, 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.