Is x6670 profitable to sell on Amazon United States?

The niche generates $105K/yr across 14 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is +1.0%. Flapen's verdict: Skip it (47/100).

How competitive is the x6670 niche?

9 brands and 31 sellers compete. The top 5 products take 72% of clicks and top 5 brands hold 91% of demand.

What do buyers complain about in x6670?

Top complaints mined from reviews: Size-Overall, Thickness, Filtration. The return rate is 0.8%.

When does demand for x6670 peak?

Demand peaks in Oct–Nov–Dec; the busiest month runs 3.3× the quietest.

What does it cost to enter the x6670 niche?

Listings span $38.90–$116.41; the average listing price is $63.40 (sweet spot $15–$100). The average incumbent carries 2,358 reviews — the moat a new listing must climb.

x6670

Skip it

A concentrated shelf (top 5 take 72% of clicks) — this niche doesn't clear our bar today.

Conversion

Incredible15.7%

search→purchase rate — share of searches ending in a sale

Returns

Incredible0.8%

return rate — above 5% kills the launch gate

Avg price

Great$63.40

avg listing price — sweet spot $15–$100

Price range

Great$38.90–$116.41

cheapest to priciest tracked listing — scored on the share inside $15–$100

Review moat

Okay2,358

avg incumbent reviews — the moat a new listing must climb

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Market size

Okay$105K

$105K/yr · 11K searches

Growth

Okay+1.0%

90-day search growth — must beat 0% to launch

Brand share

Bad91%

top-5 brand share — brand-locked demand

Competition

Bad72%

top-5 click share — a locked-up shelf

Signals High Price

According to Flapen's Amazon United States niche tracking, x6670 is a $105K/yr Amazon United States market (11K searches/yr). The top 5 brands hold 91% of demand. Demand peaks in Oct–Nov–Dec. Verdict: Skip it — 47/100.

Data updated Jul 27, 2026 · scored weekly · How we score niches

x6670 market data

Units sold / yr: 2K–2K; avg 100–250/product
Revenue / yr: $95K–$127K; units × avg price
Conversion rate: 15.7%
Avg BSR: #201
Page quality: 0%
Prime: 79%
Sponsored: 93%
Out of stock: 3.6%
Avg brand age: 51 months
Avg seller age: 189 days

Competition & brand share

The top 5 products capture 72% of clicks — a locked-up shelf that new listings rarely crack.

Brands

9 flat

Sellers

Top-5 brand share

91%

Top 20: 100%

Top-5 click share

72%

Top 20: 100%

Open market

HEALTHY CLIMATE46%
Lennox15%
Filterbuy14%
Filtrete10%
AIRx Filters6%
DerBlue3%
Open — no brand owns it (3 brands, 7%)

Demand & seasonality

Weekly Amazon search volume, last 100 weeks — +1.0% search growth over the last 90 days.

Peak months: Oct, Nov, Dec · busiest ÷ quietest = 3.3×

Open Trend

Top x6670 products on Amazon

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 14 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Lennox X6670 16x25x5 Air Filter MERV 11 HVAC AC Furnace Filters Lennox Healthy Climate Filter for Home with Cleaning Cloth 2-Pack (Actual Size: 15.75 x 24.75 x 4.38 Inches)

HEALTHY CLIMATE$59.204.8★57 rev

Lennox X6670 - (2-Pack) Healthy Climate 16 x 25 x 5 OEM HCF16-11 Air Filter MERV 11

Lennox$60.624.8★1,781 rev

Filterbuy 16x25x5 Air Filter MERV 13 Optimal Smoke & Allergy Defense (2-Pack) Pleated HVAC AC Furnace Filters for Honeywell FC100A1029 Lennox X6670 and More (Actual Size: 15.75 x 24.75 x 4.38)

Filterbuy$71.154.6★924 rev

Filtrete 16x25x5 Air Filter MERV 11 MPR 1000 Micro Allergen Defense 2-Pack Fits Lennox AC Furnace HVAC Filters for Home Pleated Electrostatic (Actual Size 15.63x24.74x4.31 in)

Filtrete$47.854.6★1,680 rev

Lennox X6670 MERV 11 Box Replacement Filter also for Honeywell 16 H x 25 L x 5 W (3-Pack)

HEALTHY CLIMATE$85.114.8★3,043 rev

Newest

by launch date

2 Pack 16x25x5 Furnace Filter Replacement Compatible with Lennox X6670 HCF16 MERV 13 Pleated HVAC Foldable Design Easy Installation

Henmfely$50.188 rev

5mo ago

Lennox X6670 16x25x5 Air Filter MERV 11 HVAC AC Furnace Filters Lennox Healthy Climate Filter for Home with Cleaning Cloth 2-Pack (Actual Size: 15.75 x 24.75 x 4.38 Inches)

HEALTHY CLIMATE$59.2057 rev

9mo ago

DerBlue 2PACK 16x25x5 MERV 13 Furnace Filter Replacement Compatible with Lennox X6670 HCF16 Pleated HVAC Foldable Design for Easy Installation & Space-Saving(Actual Size: 15.75 x 24.75 x 4.38in)

DerBlue$47.5160 rev

11mo ago

Filtrete 16x25x5 AC Furnace Air Filter MERV 13 MPR 1900 Premium Allergen Bacteria & Virus Filter Electrostatic Air Cleaning Filter 2-Pack (Actual Size 15.75 x 24.13 x 4.88 in)

Filtrete$73.09379 rev

1y ago

AIRX FILTERS WICKED CLEAN AIR. 16x25x5 Air Filter MERV 11 Compatible with Lennox X6670 Air Filter 2 Pack

AIRx Filters$48.7793 rev

2y ago

What buyers say about x6670

What buyers praise and complain about, mined from review topics.

What buyers love

Filtration24%

“Good Filtration performance”

Size-Overall21%

“Fit well”

Quality-Overall17%

“Good quality”

Advertised Vs Actual Product10%

“As advertised”

Value For Money10%

“Fair price”

Ease Of Use3%

“easy to use”

Assembly/Installation2%

“When these showed up I was surprised to find out I actually had to put them together”

Strength2%

“Seems well built and sturdy”

Durability1%

“Durability”

Storage Capacity1%

“But, the accordion style is convenient for storage for the second one”

What buyers complain about

Size-Overall31%

“too short (16 inch dimension)”

Thickness9%

“as they are both 4.5 inch thick”

Filtration9%

“Filter is not true to size-it's larger”

Value For Money8%

“Not worth saving 7 bucks over the Nordic Pure's”

Assembly/Installation8%

“This was horrible- these actually require assembly”

Quality-Overall8%

“Poor Quality”

Strength3%

“A little flimsy”

Stretchability/Expandability/Elasticity3%

“Couldnt get it to stretch out enough to fit my furnace”

Compatibility-Overall3%

“It is not compatible”

Advertised Vs Actual Product1%

“this is not true to size stated”

Top return reasons

Size-Overall65%

Filtration16%

Compatibility-Overall8%

Advertised Vs Actual Product3%

Assembly/Installation2%

Value For Money1%

Defective Material/Parts1%

Quality-Overall1%

Product Condition0%

Thickness0%

Common questions

Is x6670 profitable to sell on Amazon United States?: The niche generates $105K/yr across 14 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is +1.0%. Flapen's verdict: Skip it (47/100).
How competitive is the x6670 niche?: 9 brands and 31 sellers compete. The top 5 products take 72% of clicks and top 5 brands hold 91% of demand.
What do buyers complain about in x6670?: Top complaints mined from reviews: Size-Overall, Thickness, Filtration. The return rate is 0.8%.
When does demand for x6670 peak?: Demand peaks in Oct–Nov–Dec; the busiest month runs 3.3× the quietest.
What does it cost to enter the x6670 niche?: Listings span $38.90–$116.41; the average listing price is $63.40 (sweet spot $15–$100). The average incumbent carries 2,358 reviews — the moat a new listing must climb.