Is 13x21.5x1 air filter profitable to sell on Amazon United States?

The niche generates $86K/yr across 16 tracked products. 90-day search growth is +53.2%. Flapen's verdict: Skip it (48/100).

How competitive is the 13x21.5x1 air filter niche?

7 brands and 10 sellers compete. The top 5 products take 76% of clicks and top 5 brands hold 96% of demand.

What do buyers complain about in 13x21.5x1 air filter?

Top complaints mined from reviews: Strength, Quality-Overall, Filtration. The return rate is 0.2%.

When does demand for 13x21.5x1 air filter peak?

Demand peaks in Jun–Jul; the busiest month runs 2.2× the quietest.

What does it cost to enter the 13x21.5x1 air filter niche?

Listings span $26.55–$60.18; the average listing price is $41.77 (sweet spot $15–$100). The average incumbent carries 14,247 reviews — the moat a new listing must climb.

13x21.5x1 air filter

Skip it

Brand-locked demand (top 5 brands take 96% of clicks) — this niche doesn't clear our bar today.

Returns

Incredible0.2%

return rate — above 5% kills the launch gate

Avg price

Incredible$41.77

avg listing price — sweet spot $15–$100

Price range

Incredible$26.55–$60.18

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

Conversion

Great7.2%

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

Growth

Good+53.2%

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

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Market size

Bad$86K

$86K/yr · 28K searches

Competition

Bad76%

top-5 click share — a locked-up shelf

Review moat

Bad14,247.44

avg incumbent reviews — the moat a new listing must climb

Brand share

Bad96%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, 13x21.5x1 air filter is a $86K/yr Amazon United States market (28K searches/yr). The top 5 brands hold 96% of demand. Demand peaks in Jun–Jul. Verdict: Skip it — 48/100.

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

13x21.5x1 air filter market data

Units sold / yr: 3K–3K; avg 100–250/product
Revenue / yr: $104K–$125K; units × avg price
Conversion rate: 7.2%
Avg BSR: #241
Page quality: 0%
Prime: 25%
Sponsored: 75%
Out of stock: 0.0%
Avg brand age: 71 months
Avg seller age: 197 days

Competition & brand share

The top 5 products capture 76% of clicks — a locked-up shelf that new listings rarely crack.

Brands

7 flat

Sellers

Top-5 brand share

96%

Top 20: 100%

Top-5 click share

76%

Top 20: 100%

Open market

Filterbuy34%
Filtrete28%
Filter King25%
Aerostar7%
AIRx Filters2%
Simply2%
Open — no brand owns it (1 brand, 2%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +53.2% search growth over the last 90 days.

Peak months: Jun, Jul · busiest ÷ quietest = 2.2×

Open Trend

Top 13x21.5x1 air filter search terms

13x21.5x1 air filter15K/yr +49.1%10.2% conv.
air filter 13x21.5x16K/yr +56.9%6.7% conv.
furnace filters 13x21.5x14K/yr +55.6%1.6% conv.
13x21.5x1 furnace filter4K/yr +59.8%0.9% conv.

All search terms

Top 13x21.5x1 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 16 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Filtrete 13x21.5x1 AC Furnace Air Filter MPR 700 MERV 8 Tough on Pollen Easy on Airflow 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 2-Pack (Actual Size 12.69 x 21.19 x 0.81 in)

Filtrete$26.554.7★740 rev

Filter King 13x21.5x1 Air Filter (MERV 8) (4-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 13 x 21.5 x .75)

Filter King$39.454.7★4,436 rev

Filterbuy 13x21.5x1 Air Filter MERV 8 Essential Dust & Allergy Defense (4-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 12.88 x 21.50 x 0.75)

Filterbuy$44.874.7★703 rev

Aerostar 13x21.5x1 MERV 8 Pleated Air Filter 4 Pack AC Furnace Filters HVAC Filter Air Conditioner Filters Heater Filters Replacement for Home (Actual Size: 12.875x21.5x0.75)

Aerostar$44.124.7★1,155 rev

Filterbuy 13x21.5x1 Air Filter MERV 8 Essential Dust & Allergy Defense (3-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 12.88 x 21.50 x 0.75)

Filterbuy$36.604.7★9,643 rev

Newest

by launch date

Filtrete 13x21.5x1 AC Furnace Air Filter MPR 700 MERV 8 Tough on Pollen Easy on Airflow 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 2-Pack (Actual Size 12.69 x 21.19 x 0.81 in)

Filtrete$26.55740 rev

1y ago

Filtrete 13x21.5x1 AC Furnace Air Filter MPR 700 MERV 8 Tough on Pollen Easy on Airflow 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 4-Pack (Actual Size 12.69 x 21.19 x 0.81 in)

Filtrete$42.956,265 rev

1y ago

Filtrete 13.5x21.5x1 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 13.187 x 21.187 x 0.81 in)

Filtrete$42.126,265 rev

2y ago

AIRx Filters 13x21.5x1 Furnace Filter MERV 8 Electrostatic Pleated Replacement HVAC AC Air Filter with Advanced Filtration Technology 6-Pack

AIRx Filters$47.644 rev

2y ago

Filterbuy 13x21.5x1 Air Filter MERV 8 Essential Dust & Allergy Defense (3-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 12.88 x 21.50 x 0.75)

Filterbuy$36.609,643 rev

3y ago

What buyers say about 13x21.5x1 air filter

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

What buyers love

Size-Overall27%

“Fit great”

Value For Money23%

“Good price point”

Filtration13%

“Good filter”

Quality-Overall13%

“Good product”

Advertised Vs Actual Product6%

“working as they should”

Allergies6%

“From an allergy and air-quality standpoint, I am incredibly happy with this purchase”

What buyers complain about

Strength33%

“are super flimsy”

Quality-Overall11%

“But, I have one, maybe petty complaint”

Filtration11%

“Hard to find a 13x21.5 filter anywhere in person around me”

Value For Money11%

“all the ones online are kindve pricey with the exception of the 6-12 packs which I cant afford all at once tbh”

Top return reasons

Size-Overall75%

Compatibility-Overall8%

Filtration7%

Assembly/Installation3%

Certifications2%

Functionality-Overall2%

Thickness2%

Maintenance And Repair1%

Defective Material/Parts1%

Advertised Vs Actual Product1%

Common questions

Is 13x21.5x1 air filter profitable to sell on Amazon United States?: The niche generates $86K/yr across 16 tracked products. 90-day search growth is +53.2%. Flapen's verdict: Skip it (48/100).
How competitive is the 13x21.5x1 air filter niche?: 7 brands and 10 sellers compete. The top 5 products take 76% of clicks and top 5 brands hold 96% of demand.
What do buyers complain about in 13x21.5x1 air filter?: Top complaints mined from reviews: Strength, Quality-Overall, Filtration. The return rate is 0.2%.
When does demand for 13x21.5x1 air filter peak?: Demand peaks in Jun–Jul; the busiest month runs 2.2× the quietest.
What does it cost to enter the 13x21.5x1 air filter niche?: Listings span $26.55–$60.18; the average listing price is $41.77 (sweet spot $15–$100). The average incumbent carries 14,247 reviews — the moat a new listing must climb.