Is 21x22x1 air filter profitable to sell on Amazon United States?

The niche generates $40K/yr across 11 tracked products. 90-day search growth is +65.5%. Flapen's verdict: Skip it (41/100).

How competitive is the 21x22x1 air filter niche?

4 brands and 8 sellers compete. The top 5 products take 82% of clicks and top 5 brands hold 100% of demand.

What do buyers complain about in 21x22x1 air filter?

Top complaints mined from reviews: Size-Overall, Quality-Overall, Value For Money. The return rate is 0.8%.

What does it cost to enter the 21x22x1 air filter niche?

Listings span $39.11–$71.23; the average listing price is $52.96 (sweet spot $15–$100). The average incumbent carries 20,867 reviews — the moat a new listing must climb.

21x22x1 air filter

Skip it

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

Returns

Incredible0.8%

return rate — above 5% kills the launch gate

Price range

Incredible$39.11–$71.23

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

Avg price

Great$52.96

avg listing price — sweet spot $15–$100

Growth

Great+65.5%

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

Conversion

Okay3.2%

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

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Review moat

Bad20,867.18

avg incumbent reviews — the moat a new listing must climb

Competition

Bad82%

top-5 click share — a locked-up shelf

Market size

Bad$40K

$40K/yr · 23K searches

Brand share

Bad100%

top-5 brand share — brand-locked demand

Signals High Price

According to Flapen's Amazon United States niche tracking, 21x22x1 air filter is a $40K/yr Amazon United States market (23K searches/yr). The top 5 brands hold 100% of demand. Verdict: Skip it — 41/100.

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

21x22x1 air filter market data

Units sold / yr: 1K–2K; avg 100–250/product
Revenue / yr: $66K–$79K; units × avg price
Conversion rate: 3.2%
Avg BSR: #173
Page quality: 0%
Prime: 27%
Sponsored: 91%
Out of stock: 0.0%
Avg brand age: 83 months
Avg seller age: 242 days

Competition & brand share

The top 5 products capture 82% of clicks — a locked-up shelf that new listings rarely crack.

Brands

4 falling

Sellers

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

82%

Top 20: 100%

Open market

Filterbuy50%
Filtrete31%
Filter King14%
Simply5%

Top 21x22x1 air filter search terms

21x22x1 air filter11K/yr +53.7%7.6% conv.
air filter 21x22x16K/yr +58.3%3.9% conv.
21x22x1 furnace filter3K/yr +104.9%0.4% conv.
furnace filters 21x22x13K/yr +85.4%0.2% conv.

All search terms

Top 21x22x1 air filter 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 11 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Filtrete 21x22x1 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 20.69 x 21.69 x 0.81 in)

Filtrete$58.924.6★627 rev

Filterbuy 21x22x1 Air Filter MERV 8 Essential Dust & Allergy Defense (4-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 20.50 x 21.50 x 0.75)

Filterbuy$57.234.7★671 rev

Filterbuy 21x22x1 Air Filter MERV 8 Essential Dust & Allergy Defense (6-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 20.50 x 21.50 x 0.75)

Filterbuy$67.134.7★51,098 rev

Filterbuy 21x22x1 Air Filter MERV 8 Essential Dust & Allergy Defense (2-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 20.50 x 21.50 x 0.75)

Filterbuy$39.114.6★68,921 rev

Filter King 21x22x1 Air Filter (MERV 8) (6-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 20.5 x 21.5 x .75)

Filter King$63.004.7★2,030 rev

Newest

by launch date

Filtrete 21x22x1 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 20.69 x 21.69 x 0.81 in)

Filtrete$58.92627 rev

1y ago

Simply 20x22x1 Air Filter Merv 8 6 Pack For Home AC Furnace & HVAC (Actual Size: 19.75x21.75x0.75) DUST Pet & Allergy Control

Simply$42.3153,363 rev

4y ago

Simply 21x22x1 Air Filter Merv 8 4 Pack For Home AC Furnace & HVAC (Actual Size: 20.75x21.75x0.75) DUST Pet & Allergy Control

Simply$45.255,182 rev

4y ago

Filter King 21x22x1 Air Filter (MERV 8) (2-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 20.5 x 21.5 x .75)

Filter King$40.056 rev

7y ago

Filter King 21x22x1 Air Filter (MERV 8) (6-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 20.5 x 21.5 x .75)

Filter King$63.002,030 rev

7y ago

What buyers say about 21x22x1 air filter

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

What buyers love

Filtration42%

“We've purchased filters from Filterbuy for 11 years”

Quality-Overall17%

“have been pleased with the quality”

Value For Money17%

“Excellent quality/big price jump”

What buyers complain about

Size-Overall33%

“Actual Size: 19.50 x 21.50 x 0.75 that 1/4 inch difference is too High”

Quality-Overall33%

“Poor quality”

Value For Money17%

“the price just keeps going up”

Top return reasons

Size-Overall78%

Compatibility-Overall9%

Filtration8%

Defective Material/Parts1%

Assembly/Installation1%

Height1%

Value For Money1%

Adhesion/Stickiness0%

Advertised Vs Actual Product0%

Strength0%

Common questions

Is 21x22x1 air filter profitable to sell on Amazon United States?: The niche generates $40K/yr across 11 tracked products. 90-day search growth is +65.5%. Flapen's verdict: Skip it (41/100).
How competitive is the 21x22x1 air filter niche?: 4 brands and 8 sellers compete. The top 5 products take 82% of clicks and top 5 brands hold 100% of demand.
What do buyers complain about in 21x22x1 air filter?: Top complaints mined from reviews: Size-Overall, Quality-Overall, Value For Money. The return rate is 0.8%.
What does it cost to enter the 21x22x1 air filter niche?: Listings span $39.11–$71.23; the average listing price is $52.96 (sweet spot $15–$100). The average incumbent carries 20,867 reviews — the moat a new listing must climb.