Is 17x21x1 air filter profitable to sell on Amazon United States?

The niche generates $65K/yr across 6 tracked products. 90-day search growth is +44.3%. Flapen's verdict: Skip it (44/100).

How competitive is the 17x21x1 air filter niche?

3 brands and 7 sellers compete. The top 5 products take 98% of clicks and top 5 brands hold 100% of demand.

What do buyers complain about in 17x21x1 air filter?

Top complaints mined from reviews: Filtration, Quality-Overall, Design-Overall. The return rate is 1.7%.

When does demand for 17x21x1 air filter peak?

Demand peaks in Jul–Aug; the busiest month runs 1.7× the quietest.

What does it cost to enter the 17x21x1 air filter niche?

Listings span $31.88–$59.92; the average listing price is $42.82 (sweet spot $15–$100). The average incumbent carries 2,195 reviews — the moat a new listing must climb.

17x21x1 air filter

Skip it

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

Conversion

Incredible12.0%

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

Avg price

Incredible$42.82

avg listing price — sweet spot $15–$100

Price range

Incredible$31.88–$59.92

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

Returns

Great1.7%

return rate — above 5% kills the launch gate

Growth

Good+44.3%

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

Review moat

Okay2,195.33

avg incumbent reviews — the moat a new listing must climb

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Market size

Bad$65K

$65K/yr · 13K searches

Competition

Bad98%

top-5 click share — a locked-up shelf

Brand share

Bad100%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, 17x21x1 air filter is a $65K/yr Amazon United States market (13K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jul–Aug. Verdict: Skip it — 44/100.

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

17x21x1 air filter market data

Units sold / yr: 2K–2K; avg 100–250/product
Revenue / yr: $64K–$86K; units × avg price
Conversion rate: 12.0%
Avg BSR: #327
Page quality: 0%
Prime: 33%
Sponsored: 83%
Out of stock: 0.0%
Avg brand age: 55 months
Avg seller age: 213 days

Competition & brand share

The top 5 products capture 98% of clicks — a locked-up shelf that new listings rarely crack.

Brands

3 flat

Sellers

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

98%

Top 20: 100%

Open market

Filter King57%
Filtrete38%
Aerostar4%

Demand & seasonality

Weekly Amazon search volume, last 102 weeks — +44.3% search growth over the last 90 days.

Peak months: Jul, Aug · busiest ÷ quietest = 1.7×

Open Trend

Top 17x21x1 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 6 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Filter King 17x21x1 Air Filter (MERV 8) (4-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)

Filter King$38.634.7★1,569 rev

Filtrete 17x21x1 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 16.69 x 20.69 x 0.81 in)

Filtrete$42.304.7★6,265 rev

Filter King 17x21x1 Air Filter (MERV 8) (2-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)

Filter King$31.884.5★181 rev

Filter King 17x21x1 Air Filter (MERV 8) (6-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)

Filter King$59.924.6★90 rev

Aerostar 16.375x21.5x1 MERV 11 Air Filter 4 Count ACTUAL SIZE (16.50 x 21.50 x 0.75) HVAC Air Conditioning & Furnace Filter for Dust Pet Dander Smoke & Allergies (MPR 1200 / FPR 7) Made in USA

Aerostar$33.334.7★4,106 rev

Newest

by launch date

Filtrete 17x21x1 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 16.69 x 20.69 x 0.81 in)

Filtrete$42.306,265 rev

2y ago

Filter King 17x21x1 Air Filter (MERV 8) (5-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)

Filter King$50.87961 rev

3y ago

Aerostar 16.375x21.5x1 MERV 11 Air Filter 4 Count ACTUAL SIZE (16.50 x 21.50 x 0.75) HVAC Air Conditioning & Furnace Filter for Dust Pet Dander Smoke & Allergies (MPR 1200 / FPR 7) Made in USA

Aerostar$33.334,106 rev

6y ago

Filter King 17x21x1 Air Filter (MERV 8) (2-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)

Filter King$31.88181 rev

7y ago

Filter King 17x21x1 Air Filter (MERV 8) (6-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)

Filter King$59.9290 rev

7y ago

What buyers say about 17x21x1 air filter

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

What buyers love

Quality-Overall44%

“Good product”

Filtration19%

“Really good filters”

Size-Overall19%

“Fit well”

Value For Money6%

“Perfect and Great price”

Ease Of Use6%

“Easy to use”

Storage Capacity6%

“love having a bulk supply”

What buyers complain about

Filtration33%

“This filter is incredibly cheap and flimsy”

Quality-Overall33%

“Cheap and defective”

Design-Overall33%

“Definite design flaw”

Top return reasons

Size-Overall73%

Filtration14%

Compatibility-Overall6%

Defective Material/Parts2%

Value For Money1%

Functionality-Overall1%

Advertised Vs Actual Product1%

Thickness0%

Flexibility0%

Color0%

Common questions

Is 17x21x1 air filter profitable to sell on Amazon United States?: The niche generates $65K/yr across 6 tracked products. 90-day search growth is +44.3%. Flapen's verdict: Skip it (44/100).
How competitive is the 17x21x1 air filter niche?: 3 brands and 7 sellers compete. The top 5 products take 98% of clicks and top 5 brands hold 100% of demand.
What do buyers complain about in 17x21x1 air filter?: Top complaints mined from reviews: Filtration, Quality-Overall, Design-Overall. The return rate is 1.7%.
When does demand for 17x21x1 air filter peak?: Demand peaks in Jul–Aug; the busiest month runs 1.7× the quietest.
What does it cost to enter the 17x21x1 air filter niche?: Listings span $31.88–$59.92; the average listing price is $42.82 (sweet spot $15–$100). The average incumbent carries 2,195 reviews — the moat a new listing must climb.