3 inch inline duct fan
Skip itA small market ($39K/yr) — this niche doesn't clear our bar today.
Avg price
Incredible$31.70avg listing price — sweet spot $15–$100
Price range
Incredible$19.33–$49.91cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Good4.3★avg incumbent rating — lower means beatable quality
Review moat
Good777avg incumbent reviews — the moat a new listing must climb
Brand share
Good71%top-5 brand share — brands hold most of the demand
Returns
Okay3.4%return rate — above 5% kills the launch gate
Conversion
Okay3.5%search→purchase rate — share of searches ending in a sale
Competition
Okay67%top-5 click share — leaders hold, buyers still browse
Growth
Bad-16.8%90-day search growth — must beat 0% to launch
Market size
Bad$39K$39K/yr · 35K searches
According to Flapen's Amazon United States niche tracking, 3 inch inline duct fan is a $39K/yr Amazon United States market (35K searches/yr). The top 5 brands hold 71% of demand. Verdict: Skip it — 43/100.
Data updated Jul 14, 2026 · scored weekly · How we score niches
3 inch inline duct fan market data
- Units sold / yr
- 1K–2K
- avg 0–100/product
- Revenue / yr
- $40K–$48K
- units × avg price
- Conversion rate
- 3.5%
- Avg BSR
- #561
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 100%
- Out of stock
- 1.0%
- Avg brand age
- 46 months
- Avg seller age
- 180 days
Competition & brand share
The top 5 products take 67% of clicks — established leaders, but buyers still shop beyond them.Brands
13 flat
Sellers
18
Top-5 brand share
71%
Top 20: 100%
Top-5 click share
67%
Top 20: 100%
Open market
24%
- Hon&Guan36%
- POLISI3D12%
- WDERAIR8%
- Wathai8%
- SEAFLO7%
- Qofioeuo5%
Demand
Weekly Amazon search volume, last 16 weeks — -16.8% search growth over the last 90 days.Top 3 inch inline duct fan search terms
- 3 inch inline duct fan6K/yr
- 3 inch exhaust fan6K/yr
- 3 inch inline fan6K/yr
- 3 duct fan5K/yr
- 3 inch duct fan5K/yr
- 3 inline fan3K/yr
- 3 inline duct fan3K/yr
Top 3 inch inline duct fan 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.
All 15 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Hon&Guan 3 Inch Inline Blower Fan with Speed Controller 120 CFM with 20W Ultra-Low Power and Low Noise
Hon&Guan$37.954.3★2,961 rev
Powerful 3 Inch Inline Duct Ventilation Fan AC Vent Blower Exhaust Fan w/ 1.5M Pipe Enhanced Air Flow Low Noise for 3D Printer Enclosure Laser Engraver Cover Resin Greenhouse Ventilation Equipment
POLISI3D$39.644.1★189 rev
Wathai 80mm Small 12V DC Axial Exhaust Fan with AC Adapter 3 Inch Duct Fan for Fume Extractor Soldering Smoke 3D Printer Enclosure Laser Engraver Dual Ball High Airflow
Wathai$27.864.6★192 rev
Qofioeuo 3 Inch Inline Duct Fan 220m with 6.6ft Duct and Switch
Qofioeuo$49.914.8★10 rev
WDERAIR 80mm x 38mm 3 Inch Duct 12V Computer Exhaust Fan with AC Variable Speed High Airflow Small Ventilation Fan Dual Ball for Paint Booth Fume Extractor 3D Printer Greenhouse Dryer Booster Cooling
WDERAIR$24.264.5★39 rev
Newest
by launch dateWDERAIR 80mm x 38mm 3 Inch Duct 12V Computer Exhaust Fan with AC Variable Speed High Airflow Small Ventilation Fan Dual Ball for Paint Booth Fume Extractor 3D Printer Greenhouse Dryer Booster Cooling
WDERAIR$24.2639 rev
Qofioeuo 3 Inch Inline Duct Fan 220m with 6.6ft Duct and Switch
Qofioeuo$49.9110 rev
3inch Inline Duct Fan Inline Ventilation Exhaust Fan 260 CFM Duct Intake Extractor Fan for Vent Bathroom Kitchen Grow Tent Hydroponics 3D Printer
Generic$39.2514 rev
Wathai 80mm Small 12V DC Axial Exhaust Fan with AC Adapter 3 Inch Duct Fan for Fume Extractor Soldering Smoke 3D Printer Enclosure Laser Engraver Dual Ball High Airflow
Wathai$27.86192 rev
WDERAIR 80mm x 25mm 3 Inch Duct Household Ventilation 12V Exhaust Fan with Speed Controller for DIY Greenhouse 3D Print Smoke Paint Fume Extractor-D8025
WDERAIR$22.0756 rev
Trending
90-day click momentumWDERAIR 80mm x 38mm 3 Inch Duct 12V Computer Exhaust Fan with AC Variable Speed High Airflow Small Ventilation Fan Dual Ball for Paint Booth Fume Extractor 3D Printer Greenhouse Dryer Booster Cooling
WDERAIR$24.264.5★
Qofioeuo 3 Inch Inline Duct Fan 220m with 6.6ft Duct and Switch
Qofioeuo$49.914.8★
VIVOSUN 4 Inline Exhaust Fan & Speed Controller Low Noise Workshop 130 CFM Duct Fan for HVAC Ventilation Vent Booster Fan in Grow Tent Basement Bathroom Kitchen Attic 3D Printer
VIVOSUN$26.184.3★
SEAFLO 3 in-Line Bilge Blower Fan 145CFM 12V 3.0A Max Draw 5-Blade Fan Ultra-Quiet Operation 3 Inch for Yacht/Sailboat/Boat- ISO 8846 CE & RoHs Certified - 4-Year Warranty
SEAFLO$23.704.5★
Hon&Guan 3 Inch Inline Blower Fan with Speed Controller 120 CFM with 20W Ultra-Low Power and Low Noise
Hon&Guan$37.954.3★
What buyers say about 3 inch inline duct fan
What buyers praise and complain about, mined from review topics.What buyers love
“Build quality seems solid overall”
“it functions as advertised”
“it was easy to incorporate into my setup”
“Fan is quite powerful”
“Worth it”
“Easy to use”
“Nicely built”
“Great for boosting airflow in a long distance with easy installation”
“Great for soldering”
“perfect sized”
What buyers complain about
“Way too loud”
“Junk”
“The blade needed to be broke free after it arrived”
“Broke way too easily”
“Also, as others have mentioned, the case is not sealed, so odors from the vent pipe escape into the attic and are not removed from the space”
“Inaccurate and misleading description”
“that friction causes fatigue which means I am not very optimistic on its durability”
“My only issue was it did not come with the hardware for mounting”
“mine doesn't work right”
“the fan itself is small”
Top return reasons
Common questions
- Is 3 inch inline duct fan profitable to sell on Amazon United States?
- The niche generates $39K/yr across 15 tracked products. 0 of 2 products launched in the last 360 days are still selling. 90-day search growth is -16.8%. Flapen's verdict: Skip it (43/100).
- How competitive is the 3 inch inline duct fan niche?
- 13 brands and 18 sellers compete. The top 5 products take 67% of clicks and top 5 brands hold 71% of demand.
- What do buyers complain about in 3 inch inline duct fan?
- Top complaints mined from reviews: Noise Level, Quality-Overall, Strength. The return rate is 3.4%.
- What does it cost to enter the 3 inch inline duct fan niche?
- Listings span $19.33–$49.91; the average listing price is $31.70 (sweet spot $15–$100). The average incumbent carries 777 reviews — the moat a new listing must climb.