Is 16x20x4 air filter profitable to sell on Amazon United States?

The niche generates $1.1M/yr across 21 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is +18.9%. Flapen's verdict: Launch it (61/100).

How competitive is the 16x20x4 air filter niche?

11 brands and 42 sellers compete. The top 5 products take 61% of clicks and top 5 brands hold 86% of demand.

What do buyers complain about in 16x20x4 air filter?

Top complaints mined from reviews: Size-Overall, Advertised Vs Actual Product, Filtration. The return rate is 1.1%.

When does demand for 16x20x4 air filter peak?

Demand peaks in Jul; the busiest month runs 1.6× the quietest.

What does it cost to enter the 16x20x4 air filter niche?

Listings span $18.85–$117.85; the average listing price is $58.49 (sweet spot $15–$100). The average incumbent carries 8,698 reviews — the moat a new listing must climb.

16x20x4 air filter

Launch it

A $1.1M/yr market growing +18.9% this quarter with returns at 1.1% — clears our launch bar.

Conversion

Great11.9%

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

Returns

Great1.1%

return rate — above 5% kills the launch gate

Avg price

Great$58.49

avg listing price — sweet spot $15–$100

Price range

Great$18.85–$117.85

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

Market size

Great$1.1M

$1.1M/yr · 165K searches

Growth

Okay+18.9%

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

Competition

Okay61%

top-5 click share — leaders hold, buyers still browse

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Brand share

Okay86%

top-5 brand share — brands hold most of the demand

Review moat

Bad8,698.29

avg incumbent reviews — the moat a new listing must climb

Signals High Price

According to Flapen's Amazon United States niche tracking, 16x20x4 air filter is a $1.1M/yr Amazon United States market (165K searches/yr). The top 5 brands hold 86% of demand. Demand peaks in Jul. Verdict: Launch it — 61/100.

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

16x20x4 air filter market data

Units sold / yr: 20K–25K; avg 750–1,000/product
Revenue / yr: $1.2M–$1.5M; units × avg price
Conversion rate: 11.9%
Avg BSR: #186
Page quality: 0%
Prime: 33%
Sponsored: 86%
Out of stock: 0.0%
Avg brand age: 57 months
Avg seller age: 179 days

Competition & brand share

The top 5 products take 61% of clicks — established leaders, but buyers still shop beyond them.

Brands

11 rising

Sellers

Top-5 brand share

86%

Top 20: 100%

Top-5 click share

61%

Top 20: 99%

Open market

Filterbuy43%
Filtrete19%
Nordic Pure13%
MANN+HUMMEL6%
Honeywell5%
BNX5%
Open — no brand owns it (5 brands, 9%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +18.9% search growth over the last 90 days.

Peak months: Jul · busiest ÷ quietest = 1.6×

Open Trend

Top 16x20x4 air filter search terms

16x20x4 air filter61K/yr +30.3%12.3% conv.
16x20x4 furnace filter34K/yr -3.5%9.1% conv.
air filter 16x20x412K/yr +32.3%11.2% conv.
furnace filter 16x20x411K/yr +13.2%6.6% conv.
16x20x49K/yr +20.3%10.2% conv.
ac filter 16x20x45K/yr +102.1%5.3% conv.
16 x 20 x 4 air filter7K/yr +50.0%12.3% conv.
furnace filters 16x20x48K/yr -10.5%11.5% conv.
16x20x4 filter4K/yr +5.1%8.9% conv.
16x20x4 air filter merv 114K/yr +22.8%9.8% conv.

All search terms

Top 16x20x4 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 21 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Filterbuy 16x20x4 Air Filter MERV 8 Essential Dust & Allergy Defense (2-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 15.50 x 19.50 x 3.63)

Filterbuy$49.194.6★68,921 rev

Filtrete 16x20x4 AC Furnace Air Filter MPR 1550 MERV 12 Fits Lennox & Honeywell Allergen Electrostatic Air Cleaning Filter 2-Pack (Actual Size 15.88x19.88x4.31 in)

Filtrete$54.194.6★5,199 rev

Nordic Pure 16x20x4 (15_1/2 x 19_1/2 x 3_5/8) Pleated MERV 12 Air Filters 2 Pack

Nordic Pure$41.304.5★2,478 rev

Filterbuy 16x20x4 Air Filter MERV 8 Essential Dust & Allergy Defense (4-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 15.50 x 19.50 x 3.63)

Filterbuy$77.384.4★475 rev

Filtrete 16x20x4 AC Furnace Air Filter MERV 13 MPR 1900 Premium Allergen Bacteria & Virus Filter Electrostatic Air Cleaning Filter 2-Pack (Actual Size 15.44 x 19.75 x 4.31 in)

Filtrete$47.834.3★379 rev

Newest

by launch date

FilterTime 16x20x4 AC Furnace Air Filter MERV 8 1-Pack (exact dimensions 15.5 x 19.5 x 3.75) AC Filter Furnace Filter Home Air Filter Made in USA.

FilterTime$21.2012 rev

4mo ago

2-Pack 16x20x4 Air Filter Compatible with Honeywell FC100A1003 MERV 13 HVAC Furnace Filter Replacement Actual Size:15.94x19.75x4.38

Aerzva$44.2733 rev

9mo ago

Pro - Source 16x20x4 Pleated Air Filter Wire-Backed Pleated MERV 8 Synthetic Paperboard Frame 300 FPM 1100 CFM Use with Any Unit

PRO SOURCE$18.8520 rev

11mo ago

Filtrete 16x20x4 AC Furnace Air Filter MERV 13 MPR 1900 Premium Allergen Bacteria & Virus Filter Electrostatic Air Cleaning Filter 2-Pack (Actual Size 15.44 x 19.75 x 4.31 in)

Filtrete$47.83379 rev

1y ago

BNX TruFilter 16x20x4 (15.5 x 19.5 x 3.63 Slim Fit) MERV 13 Air Filter (2-Pack) - MADE IN USA - Air Conditioner HVAC AC Furnace Filters Health Allergies Mold Bacteria Smoke MPR 1900 FPR 10

BNX$44.71171 rev

2y ago

What buyers say about 16x20x4 air filter

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

What buyers love

Size-Overall28%

“Fit like it was made for the HVAC unit”

Filtration17%

“nice quality filter”

Quality-Overall15%

“Good quality on construction”

Value For Money13%

“Good Price”

Advertised Vs Actual Product9%

“Works as advertised”

Durability3%

“Fits and durable”

Ease Of Use3%

“Very Useful”

Air Purification1%

“provide good air quality”

Material Quality1%

“Excellent material”

Design-Overall1%

“Pretty cool design”

What buyers complain about

Size-Overall44%

“TOO SMALL”

Advertised Vs Actual Product10%

“Not the size stated”

Filtration9%

“They came kind of damaged or the filter was missing glue or a staple for the filter portion- it had a big gap between the filter and the cardboard structure”

Quality-Overall6%

“Cheap quality”

Thickness4%

“Thickness is also not 4 inches”

Assembly/Installation4%

“These require assembly”

Adhesion/Stickiness3%

“baffles glued unevenly”

Compatibility-Overall2%

“Does not fit a Honeywell filter box that needs 16x20x4”

Measurement/Reading Accuracy2%

“Not true four inches”

Maintenance And Repair2%

“Way too expensive to have to be replaced every 3 months”

Top return reasons

Size-Overall73%

Filtration14%

Compatibility-Overall6%

Advertised Vs Actual Product2%

Thickness1%

Thin1%

Value For Money1%

Certifications0%

Defective Material/Parts0%

Measurement/Reading Accuracy0%

Common questions

Is 16x20x4 air filter profitable to sell on Amazon United States?: The niche generates $1.1M/yr across 21 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is +18.9%. Flapen's verdict: Launch it (61/100).
How competitive is the 16x20x4 air filter niche?: 11 brands and 42 sellers compete. The top 5 products take 61% of clicks and top 5 brands hold 86% of demand.
What do buyers complain about in 16x20x4 air filter?: Top complaints mined from reviews: Size-Overall, Advertised Vs Actual Product, Filtration. The return rate is 1.1%.
When does demand for 16x20x4 air filter peak?: Demand peaks in Jul; the busiest month runs 1.6× the quietest.
What does it cost to enter the 16x20x4 air filter niche?: Listings span $18.85–$117.85; the average listing price is $58.49 (sweet spot $15–$100). The average incumbent carries 8,698 reviews — the moat a new listing must climb.