40mm Fan
FailThe top 5 brands take 98% of clicks, so 40mm Fan is a Fail.
- Flapen Score
- 35 / 100Ranks 6,625 of 8,347 Electronics niches · −8 vs the category median of 4335
- Market size
- $90K/yr92K searches / yr
- 90-day growth
- -0.4%search demand this quarter
- Competition
- 78%top-5 click share · 6 brands · 17 sellers
Flapen Score
40mm Fan against its category
The dotted line is the Electronics average. Past it, 40mm Fan is stronger. Inside it, weaker.
Market
The 40mm Fan market on Amazon at a glance
Shoppers on Amazon United States searched for 40mm Fan 92K times last year and spent an estimated $90K. The top 5 brands take 98% of clicks. Flapen scores it 35 out of 100, a Fail.
01 · Demand
An estimated 6.5% of those searches ended in a purchase.
Shoppers searched for this 92K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 6.5% of those searches ended in a purchase. Searches in the last 90 days moved -0.4% against the 90 days before. Searches, conversion and average price together put the market at an estimated $90K a year.
- Searches, last 12 months
- 92K
- Growth, 90 days vs prior 90
- -0.4%
- Conversion, latest week
- 6.5%
- Market size, estimated
- $90Ka year
- Peak month
- May1.4× the quietest month
- Top search term
- 40mm fan49K searches a year
02 · Price
A sale here is worth $15.12.
Listings sell for $15.12 on average, from $8.41 to $43.48. Amazon reports units sold in ranges. This niche sold 8K to 10K a year. The average listing sells 500 to 750 of them. At $15.12 that is $8K to $11K a year per listing.
- Average price
- $15.12inside the $15 to $100 sweet spot
- Price range
- $8.41–$43.48
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 8K–10K
- Units per listing a year
- 500–750
- Revenue per listing a year
- $8K–$11K
- Returns
- 3.7%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is reviews.
62% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 5.3% of listings are out of stock. The average listing ranks #137 within Internal Components. It carries 2,054 reviews at 4.54 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 62%
- Prime listings
- 100%
- Out of stock, average day
- 5.3%
- Average rank
- #137in Internal Components
- Average rating
- 4.54 starsAmazon United States average 4.42 stars
- Average reviews
- 2,054per listing
- Listings tracked
- 13
04 · Newcomers
Brands here are settling in.
The brands on the shelf have sold for 55 months on average, so the names here are settling in.
- Launched, last 12 months
- 0
- Successful launches
- 0Amazon's first-year sales bar
- Average brand age
- 55 months
Products
Top 40mm Fan products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 21, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Noctua NF-A4x20 PWM Premium Quiet Fan 4-Pin (40x20mm Brown)
- Price
- $15.87
- Rating
- 4.8/5
- Reviews
- 2,066
- Age
- 9y ago

Noctua NF-A4x10 FLX Premium Quiet Fan 3-Pin (40x10mm Brown)
- Price
- $15.83
- Rating
- 4.8/5
- Reviews
- 11,254
- Age
- 13y ago

Noctua NF-A4x10 PWM Premium Quiet Fan 4-Pin (40x10mm Brown)
- Price
- $15.99
- Rating
- 4.8/5
- Reviews
- 1,980
- Age
- 8y ago

ARCTIC S4028-6K - 40x40x28 mm Server Fan 2506000 RPM PWM Regulated 4-pin Connector 12 V DC Rack Cooling Fan - Black
- Price
- $11.79
- Rating
- 4.4/5
- Reviews
- 158
- Age
- 4y ago

WINSINN 40mm 12V Fan - Hydraulic Bearing 5000 RPM 4010 Cooling Fan Replacement for 3D Printer/DVR/PC/Electronics 30cm Cable with XH2.54-2PIN Brushless 40x10mm (5Pcs)
- Price
- $9.00
- Rating
- 4.4/5
- Reviews
- 490
- Age
- 8y ago
Trending
estimated 90-day click momentum
ARCTIC S4028-15K (5 Pack) - 40x40x28 mm Fan 1400-15000 RPM PWM Regulated 4-pin Connector 12 V DC - Black
- Price
- $43.48
- Rating
- 4.4/5
- Reviews
- 158
- Age
- 4y ago

ELUTENG Dual 40mm USB Fan with 3 Speeds Adjustable 5V PC Fan Max 5500RPM
- Price
- $10.37
- Rating
- 4.4/5
- Reviews
- 1,995
- Age
- 5y ago

WINSINN 40mm 5V Fan - Hydraulic Bearing 5000 RPM 4010 Cooling Fan Replacement for DVR/Small Appliances/Electronics 30cm Cable with XH2.54-2PIN Brushless 40x10mm (5Pcs)
- Price
- $9.02
- Rating
- 4.4/5
- Reviews
- 340
- Age
- 7y ago

Noctua NF-A4x10 5V PWM Premium Quiet Fan with USB Power Adaptor Cable 4-Pin 5V Version (40x10mm Brown)
- Price
- $15.93
- Rating
- 4.7/5
- Reviews
- 1,134
- Age
- 8y ago

WINSINN 40mm 12V Fan - Hydraulic Bearing 5000 RPM 4010 Cooling Fan Replacement for 3D Printer/DVR/PC/Electronics 30cm Cable with XH2.54-2PIN Brushless 40x10mm (5Pcs)
- Price
- $9.00
- Rating
- 4.4/5
- Reviews
- 490
- Age
- 8y ago
Newest
by launch date
GDSTIME 40mm Fan 3 Pin 12V 40x40x10mm Mini Computer PC Case DC Brushless Cooling Fan Replacement for CPU Cooler Northbridge Heatsink 3D Printers (2 Pack)
- Price
- $9.09
- Rating
- 4.3/5
- Reviews
- 505
- Age
- 1y ago

ARCTIC S4028-6K - 40x40x28 mm Server Fan 2506000 RPM PWM Regulated 4-pin Connector 12 V DC Rack Cooling Fan - Black
- Price
- $11.79
- Rating
- 4.4/5
- Reviews
- 158
- Age
- 4y ago

ARCTIC S4028-15K (5 Pack) - 40x40x28 mm Fan 1400-15000 RPM PWM Regulated 4-pin Connector 12 V DC - Black
- Price
- $43.48
- Rating
- 4.4/5
- Reviews
- 158
- Age
- 4y ago

ELUTENG Dual 40mm USB Fan with 3 Speeds Adjustable 5V PC Fan Max 5500RPM
- Price
- $10.37
- Rating
- 4.4/5
- Reviews
- 1,995
- Age
- 5y ago

WINSINN 40mm 5V Fan - Hydraulic Bearing 5000 RPM 4010 Cooling Fan Replacement for DVR/Small Appliances/Electronics 30cm Cable with XH2.54-2PIN Brushless 40x10mm (5Pcs)
- Price
- $9.02
- Rating
- 4.4/5
- Reviews
- 340
- Age
- 7y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 78% of clicks. A locked shelf that new listings rarely crack.
Brands
6 falling
Sellers
17
Est. top-5 brand share
98%
Top 20: 100%
Est. top-5 click share
78%
Top 20: 100%
Open market
0%
- Noctua76%
- ARCTIC8%
- WINSINN8%
- HiLetgo4%
- GDSTIME2%
- ELUTENG2%
- Open — no brand owns it (0%)
Demand
40mm Fan search demand
Weekly searches over the year, seasonality beneath. Pick a range.
No pronounced peak months · busiest ÷ quietest = 1.4×
Search terms
Top 40mm Fan search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- 40mm fan49K/yr
- noctua 40mm11K/yr
- noctua 40mm fan8K/yr
- 40 mm fan4K/yr
- 40mm pc fan3K/yr
- noctua nf-a4x103K/yr
- 40mm fan 12v3K/yr
- noctua nf-a4x20 pwm2K/yr
- noctua nf-a4x202K/yr
- 40mm noctua fan3K/yr
Reviews and returns
What reviews say buyers love and hate about 40mm Fan
We read the reviews and the return reasons for every product selling here.
“Fans last a day or two then make terrible noises”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
20 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common 40mm Fan questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









