Is air filter 21.5 x 23.5 x 1 profitable to sell on Amazon United States?

The niche generates $40K/yr across 7 tracked products. 90-day search growth is +68.2%. Flapen's verdict: Skip it (42/100).

How competitive is the air filter 21.5 x 23.5 x 1 niche?

3 brands and 7 sellers compete. The top 5 products take 95% of clicks and top 5 brands hold 100% of demand.

What do buyers complain about in air filter 21.5 x 23.5 x 1?

Top complaints mined from reviews: Quality-Overall, Material Quality, Value For Money. The return rate is 1.4%.

When does demand for air filter 21.5 x 23.5 x 1 peak?

Demand peaks in Jun–Jul; the busiest month runs 2.6× the quietest.

What does it cost to enter the air filter 21.5 x 23.5 x 1 niche?

Listings span $41.54–$75.50; the average listing price is $54.22 (sweet spot $15–$100). The average incumbent carries 2,165 reviews — the moat a new listing must climb.

air filter 21.5 x 23.5 x 1

Skip it

Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.

Price range

Incredible$41.54–$75.50

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

Avg price

Great$54.22

avg listing price — sweet spot $15–$100

Returns

Great1.4%

return rate — above 5% kills the launch gate

Growth

Great+68.2%

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

Conversion

Good4.9%

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

Review moat

Okay2,164.57

avg incumbent reviews — the moat a new listing must climb

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Market size

Bad$40K

$40K/yr · 15K searches

Competition

Bad95%

top-5 click share — a locked-up shelf

Brand share

Bad100%

top-5 brand share — brand-locked demand

Signals High Price

According to Flapen's Amazon United States niche tracking, air filter 21.5 x 23.5 x 1 is a $40K/yr Amazon United States market (15K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jun–Jul. Verdict: Skip it — 42/100.

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

air filter 21.5 x 23.5 x 1 market data

Units sold / yr: 1K–2K; avg 100–250/product
Revenue / yr: $68K–$81K; units × avg price
Conversion rate: 4.9%
Avg BSR: #156
Page quality: 0%
Prime: 43%
Sponsored: 71%
Out of stock: 0.0%
Avg brand age: 90 months
Avg seller age: 239 days

Competition & brand share

The top 5 products capture 95% of clicks — a locked-up shelf that new listings rarely crack.

Brands

3 falling

Sellers

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

95%

Top 20: 100%

Open market

Filter King54%
Filtrete41%
Aerostar5%

Demand & seasonality

Weekly Amazon search volume, last 102 weeks — +68.2% search growth over the last 90 days.

Peak months: Jun, Jul · busiest ÷ quietest = 2.6×

Open Trend

Top air filter 21.5 x 23.5 x 1 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 7 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Filter King 21.5x23.5x1 Air Filter (MERV 8) (4-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 21.5x23.5x.75)

Filter King$41.544.7★1,569 rev

Filtrete 21.5x23.5x1 AC Furnace Air Filter MERV 8 MPR 700 Tough on Pollen Easy on Airflow 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 4-Pack (Actual Size 21.19 x 23.19 x 0.81 in)

Filtrete$43.544.7★6,265 rev

Filter King 21.5x23.5x1 Air Filter (MERV 8) (4-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 21.5 x 23.5 x .75)

Filter King$46.304.7★4,436 rev

Filtrete 21.5x23x1 AC Furnace Air Filter MPR 700 MERV 8 Tough on Pollen Easy on Airflow 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 6-Pack (Actual Size 21.19 x 22.69 x 0.81 in)

Filtrete$47.134.6★627 rev

Aerostar 21 1/2x23 1/2x1 MERV 11 High Efficiency Pleated Air Filter 6-Pack Electrostatic AC Furnace HVAC Replacement Captures Dust Pollen Pet Dander Mold Smoke (21.5x23.5x0.75)

Aerostar$75.504.6★106 rev

Newest

by launch date

Filtrete 21.5x23x1 AC Furnace Air Filter MPR 700 MERV 8 Tough on Pollen Easy on Airflow 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 6-Pack (Actual Size 21.19 x 22.69 x 0.81 in)

Filtrete$47.13627 rev

1y ago

Filter King 21.5x23.5x1 Air Filter (MERV 8) (6-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 21.5 x 23.5 x .75)

Filter King$62.912,030 rev

1y ago

Filtrete 21.5x23.5x1 AC Furnace Air Filter MERV 8 MPR 700 Tough on Pollen Easy on Airflow 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 4-Pack (Actual Size 21.19 x 23.19 x 0.81 in)

Filtrete$43.546,265 rev

2y ago

Aerostar 21.5x23.3125x1 MERV 8-6 Count - High Efficiency Pleated HVAC Furnace & Air Conditioner Filters - Removes Dust Lint Mold & Allergy-Causing Pollen

Aerostar$62.61119 rev

3y ago

Filter King 21.5x23.5x1 Air Filter (MERV 8) (4-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 21.5 x 23.5 x .75)

Filter King$46.304,436 rev

3y ago

What buyers say about air filter 21.5 x 23.5 x 1

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

What buyers love

Quality-Overall47%

“The service and filters are of great quality”

Ease Of Use20%

“Useful”

Advertised Vs Actual Product12%

“Does the job”

Value For Money7%

“worth it for me”

Filtration5%

“The filtering material seems great”

What buyers complain about

Quality-Overall17%

“Very low quality”

Material Quality17%

“Very low quality material”

Value For Money17%

“Not what I expected for the price”

Design-Overall13%

“flimsy construction”

Flexibility13%

“sometimes it bends”

Top return reasons

Size-Overall74%

Filtration16%

Compatibility-Overall6%

Value For Money1%

Thin1%

Advertised Vs Actual Product1%

Durability0%

Material Quality0%

Mechanism Issues0%

Defective Material/Parts0%

Common questions

Is air filter 21.5 x 23.5 x 1 profitable to sell on Amazon United States?: The niche generates $40K/yr across 7 tracked products. 90-day search growth is +68.2%. Flapen's verdict: Skip it (42/100).
How competitive is the air filter 21.5 x 23.5 x 1 niche?: 3 brands and 7 sellers compete. The top 5 products take 95% of clicks and top 5 brands hold 100% of demand.
What do buyers complain about in air filter 21.5 x 23.5 x 1?: Top complaints mined from reviews: Quality-Overall, Material Quality, Value For Money. The return rate is 1.4%.
When does demand for air filter 21.5 x 23.5 x 1 peak?: Demand peaks in Jun–Jul; the busiest month runs 2.6× the quietest.
What does it cost to enter the air filter 21.5 x 23.5 x 1 niche?: Listings span $41.54–$75.50; the average listing price is $54.22 (sweet spot $15–$100). The average incumbent carries 2,165 reviews — the moat a new listing must climb.