Is 18x18x1 air filter profitable to sell on Amazon United States?

The niche generates $1.2M/yr across 20 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is +30.3%. Flapen's verdict: Launch it (60/100).

How competitive is the 18x18x1 air filter niche?

9 brands and 36 sellers compete. The top 5 products take 61% of clicks and top 5 brands hold 90% of demand.

What do buyers complain about in 18x18x1 air filter?

Top complaints mined from reviews: Size-Overall, Filtration, Quality-Overall. The return rate is 0.7%.

When does demand for 18x18x1 air filter peak?

Demand peaks in Jun–Jul; the busiest month runs 1.8× the quietest.

What does it cost to enter the 18x18x1 air filter niche?

Listings span $8.75–$45.61; the average listing price is $34.47 (sweet spot $15–$100). The average incumbent carries 17,217 reviews — the moat a new listing must climb.

18x18x1 air filter

Launch it

A $1.2M/yr market growing +30.3% this quarter with returns at 0.7% — clears our launch bar.

Conversion

Incredible14.0%

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

Returns

Incredible0.7%

return rate — above 5% kills the launch gate

Avg price

Incredible$34.47

avg listing price — sweet spot $15–$100

Market size

Great$1.2M

$1.2M/yr · 249K searches

Price range

Great$8.75–$45.61

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

Growth

Good+30.3%

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

Competition

Okay61%

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

Brand share

Bad90%

top-5 brand share — brand-locked demand

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Review moat

Bad17,216.95

avg incumbent reviews — the moat a new listing must climb

According to Flapen's Amazon United States niche tracking, 18x18x1 air filter is a $1.2M/yr Amazon United States market (249K searches/yr). The top 5 brands hold 90% of demand. Demand peaks in Jun–Jul. Verdict: Launch it — 60/100.

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

18x18x1 air filter market data

Units sold / yr: 30K–40K; avg 1,500–2,000/product
Revenue / yr: $1.0M–$1.4M; units × avg price
Conversion rate: 14.0%
Avg BSR: #51
Page quality: 0%
Prime: 75%
Sponsored: 90%
Out of stock: 0.0%
Avg brand age: 59 months
Avg seller age: 190 days

Competition & brand share

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

Brands

9 flat

Sellers

Top-5 brand share

90%

Top 20: 100%

Top-5 click share

61%

Top 20: 100%

Open market

Filtrete31%
Simply23%
Aerostar13%
Filterbuy13%
BNX10%
Flanders4%
Open — no brand owns it (3 brands, 6%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +30.3% search growth over the last 90 days.

Peak months: Jun, Jul · busiest ÷ quietest = 1.8×

Open Trend

Top 18x18x1 air filter search terms

18x18x1 air filter126K/yr +35.1%12.8% conv.
air filter 18x18x127K/yr +24.0%12.1% conv.
18x18 air filter16K/yr -4.3%13.1% conv.
ac filter 18x18x19K/yr +72.5%12.4% conv.
18 x 18 x 1 air filters for home10K/yr +37.0%13.6% conv.
furnace filters 18x18x17K/yr +32.7%5.5% conv.
air filters 18x18x17K/yr +17.6%14.6% conv.
18x18x1 air filter 6 pack3K/yr +276.0%14.9% conv.
18x18x15K/yr +33.8%13.0% conv.
18x18x1 furnace filter7K/yr -18.9%2.3% conv.

All search terms

Top 18x18x1 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 20 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Filtrete 18x18x1 Air Filter MERV 5 6-Pack MPR 300 Basic Dust Defense 3-Month Pleated Electrostatic

Filtrete$32.044.7★160,547 rev

Simply 18x18x1 Air Filter Merv 8 6 Pack For Home AC Furnace & HVAC (Actual Size: 17.75x17.75x0.75) DUST Pet & Allergy Control

Simply$36.434.7★53,363 rev

Filterbuy 18x18x1 Air Filter MERV 8 Essential Dust & Allergy Defense (4-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 17.75 x 17.75 x 0.75)

Filterbuy$34.214.7★2,167 rev

Filtrete 18x18x1 Air Filter MERV 11 MPR 1000 Allergens & Pet Dander 3-Month AC and Furnace Filters Cleaner Air Reliable Airflow 4 HVAC Filters (Actual Size 17.68 x 17.68 x 0.81 in)

Filtrete$45.614.8★25,454 rev

Aerostar 18x18x1 MERV 8 Air Filter 6 Count ACTUAL SIZE (17.50 x 17.50 x 0.75) HVAC Air Conditioning & Furnace Filter Captures Dust Lint & Pollen (MPR 600 / FPR 5) Made in USA

Aerostar$35.264.7★1,304 rev

Newest

by launch date

TRIGHTFILTERS 18x18x1 Air Filter 4 Pack Durable MERV 8 Pleated Home HVAC AC Furnace Filters Lightweight Compact Air Conditioner Filter Replacement

TRIGHTFILTERS$31.101,395 rev

9mo ago

Aerostar 18x18x1 MERV 13 Air Filter 4 Pack Set of HVAC Furnace Filters Electrostatic MPR 1500-1900 & FPR 10 (Actual Size: 17 3/4 x 17 3/4 x 3/4 inches)

Aerostar$30.441,083 rev

11mo ago

Filtrete 18x18x1 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 17.81 x 17.81 x 0.81 in)

Filtrete$26.50740 rev

1y ago

Pro- Source 18 x 18 x 1 Nominal MERV 8 35% Efficiency Wire-Backed Pleated Air Filter HVAC AC Furnance Replacement

PRO SOURCE$8.7511 rev

1y ago

TRIGHTFILTERS 18x18x1 Air Filter 4 Pack MERV 8 Pleated Dust Defense Air Filters Replacement Air Conditioner HVAC AC Furnace Filter Durable and Lightweight

TRIGHTFILTERS$32.741,900 rev

2y ago

What buyers say about 18x18x1 air filter

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

What buyers love

Size-Overall19%

“size fit accurately”

Filtration16%

“Good filter”

Value For Money15%

“Great value”

Quality-Overall15%

“Filter Quality - At A Good Price”

Advertised Vs Actual Product8%

“Works as advertised”

Strength5%

“not flimsy like the cheap ones”

Durability4%

“durable”

Allergies3%

“definitely has helped my allergies”

Ease Of Cleaning2%

“Cleans the air as it should”

Ease Of Use2%

“They are super quick and easy”

What buyers complain about

Size-Overall19%

“These are a tad bit smaller than the brand I usually buy”

Filtration16%

“The filters dont fit as well as the other brand I bought”

Quality-Overall10%

“Disappointed in you recent Quality Assurance record”

Advertised Vs Actual Product8%

“Filters are advertised as 18” x 1&” x 1”. I was skeptical when they arrived in a box 3 1/2” thick. Yes, the filters are <3/4” thick.”

Value For Money8%

“High price”

Durability5%

“Fell apart and furnace pulled filter in to intake”

Noise Level4%

“They make a whistling noise when in the air return vent”

Thickness4%

“A tad thin”

Measurement/Reading Accuracy3%

“Apparently, 3M forgot how to measure an actual 18x18x1 filter frame”

Smell3%

“allergens out of our home”

Top return reasons

Size-Overall76%

Filtration12%

Compatibility-Overall5%

Value For Money3%

Advertised Vs Actual Product1%

Defective Material/Parts1%

Quality-Overall1%

Functionality-Overall0%

Thin0%

Charging0%

Common questions

Is 18x18x1 air filter profitable to sell on Amazon United States?: The niche generates $1.2M/yr across 20 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is +30.3%. Flapen's verdict: Launch it (60/100).
How competitive is the 18x18x1 air filter niche?: 9 brands and 36 sellers compete. The top 5 products take 61% of clicks and top 5 brands hold 90% of demand.
What do buyers complain about in 18x18x1 air filter?: Top complaints mined from reviews: Size-Overall, Filtration, Quality-Overall. The return rate is 0.7%.
When does demand for 18x18x1 air filter peak?: Demand peaks in Jun–Jul; the busiest month runs 1.8× the quietest.
What does it cost to enter the 18x18x1 air filter niche?: Listings span $8.75–$45.61; the average listing price is $34.47 (sweet spot $15–$100). The average incumbent carries 17,217 reviews — the moat a new listing must climb.