6 inch inline fan
Skip itBrand-locked demand (top 5 brands take 95% of clicks) — this niche doesn't clear our bar today.
Avg price
Great$84.55avg listing price — sweet spot $15–$100
Market size
Good$477K$477K/yr · 174K searches
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Conversion
Okay3.2%search→purchase rate — share of searches ending in a sale
Competition
Okay62%top-5 click share — leaders hold, buyers still browse
Review moat
Okay3,384.7avg incumbent reviews — the moat a new listing must climb
Returns
Okay4.6%return rate — above 5% kills the launch gate
Price range
Okay$25.21–$273.63cheapest to priciest tracked listing — scored on the share inside $15–$100
Growth
Okay+3.2%90-day search growth — must beat 0% to launch
Brand share
Bad95%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, 6 inch inline fan is a $477K/yr Amazon United States market (174K searches/yr). The top 5 brands hold 95% of demand. Demand peaks in Dec. Verdict: Skip it — 39/100.
Data updated Jul 14, 2026 · scored weekly · How we score niches
6 inch inline fan market data
- Units sold / yr
- 6K–8K
- avg 100–250/product
- Revenue / yr
- $507K–$676K
- units × avg price
- Conversion rate
- 3.2%
- Avg BSR
- #76
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 96%
- Out of stock
- 6.4%
- Avg brand age
- 44 months
- Avg seller age
- 180 days
Competition & brand share
The top 5 products take 62% of clicks — established leaders, but buyers still shop beyond them.Brands
9 rising
Sellers
14
Top-5 brand share
95%
Top 20: 100%
Top-5 click share
62%
Top 20: 97%
Open market
4%
- AC Infinity49%
- VIVOSUN23%
- Hon&Guan13%
- VEVOR6%
- LEOKV3%
- Aydomer2%
- Open — no brand owns it (3 brands, 4%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +3.2% search growth over the last 90 days.Peak months: Dec · busiest ÷ quietest = 3.8×
Top 6 inch inline fan search terms
- 6 inline duct fan16K/yr
- 6 inch inline duct fan17K/yr
- 6 inch duct fan16K/yr
- 6 inch inline fan14K/yr
- ac infinity inline fan15K/yr
- inline duct fan 6 inch11K/yr
- 6 duct fan13K/yr
- inline fan 6 inch9K/yr
- 6 inline fan8K/yr
- ac infinity exhaust fan8K/yr
Top 6 inch inline 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 23 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
AC Infinity CLOUDLINE PRO S6 Quiet 6 Inline Duct Fan with Speed Controller - EC Motor Ventilation Exhaust Fan for Heating Cooling Booster Grow Tents Hydroponics
AC Infinity$97.734.8★5,508 rev
VIVOSUN 6 Inline Exhaust Fan & Speed Controller Low Noise Workshop 345 CFM Duct Fan for HVAC Ventilation Vent Booster Fan in Grow Tent Basement Bathroom Kitchen Attic 3D Printer
VIVOSUN$32.524.3★6,092 rev
AC Infinity CLOUDLINE PRO T6 Quiet 6 Inline Duct Fan with Temperature Humidity VPD Controller WiFi Integrated App Control - Ventilation Exhaust Fan for Heating Cooling Grow Tents Hydroponics
AC Infinity$146.984.8★10,105 rev
Hon&Guan 6 Inch Inline Booster Duct Fan with Speed Controller - 345 CFM Airflow with 19.2W Ultra-Low Power and Low Noise
Hon&Guan$33.074.3★2,961 rev
VEVOR Inline Duct Fan 6-Inch 400 CFM with Variable Speed Controller Quiet AC-Motor Ventilation Exhaust Fan for Cooling Booster Grow Tents Hydroponics
VEVOR$52.934.4★255 rev
Newest
by launch date
Toolazy 6 Inch Inline Booster Duct Fan with Speed Controller 345 CFM 19.2W EC Motor 3300RPM 0-100% Variable Speed 32dB Ultra-Quiet 118in Total Controller Cord Grow Tent HVAC Ventilation Fan
Toolazy$25.2126 rev
6Inch Exhaust fan Pipeline booster fan Inline duct fan 420 CFM Efficiency Air Fan for Duct Vent Bathroom Kitchen Grow Tent Hydroponics The wind is very strong.All-copper wire motors are more durable
LEOKV$59.1255 rev
Hon&Guan 6 Inch Inline Duct Fan with Upgrade Controller - 345 CFM Airflow with 19.2W Ultra-Low Power and Low Noise
Hon&Guan$34.57119 rev
VIVOSUN 6 Inline Exhaust Fan & Speed Controller Low Noise Workshop 345 CFM Duct Fan for HVAC Ventilation Vent Booster Fan in Grow Tent Basement Bathroom Kitchen Attic 3D Printer
VIVOSUN$32.526,092 rev
Aydomer 6 Inch Inline Duct Fan with Switch Low Noise High Air Flow Extractor Fan Metal Exhaust Fan with Bracket and Mesh for Basement Garage Attic Kitchen(Black)
Aydomer$27.4556 rev
Trending
90-day click momentumToolazy 6 Inch Inline Booster Duct Fan with Speed Controller 345 CFM 19.2W EC Motor 3300RPM 0-100% Variable Speed 32dB Ultra-Quiet 118in Total Controller Cord Grow Tent HVAC Ventilation Fan
Toolazy$25.213.7★
VIVOSUN G6 6 Inline Duct Fan & 3 Cycle Modes E12 Speed Controller AeroZesh Grow Tent Kit Ventilation Fan with 388 CFM EC Motor Programmable Exhaust Fan for Heating Cooling Booster Hydroponics
VIVOSUN$63.654.6★
VIVOSUN 6 Inline Exhaust Fan & Speed Controller Low Noise Workshop 345 CFM Duct Fan for HVAC Ventilation Vent Booster Fan in Grow Tent Basement Bathroom Kitchen Attic 3D Printer
VIVOSUN$32.524.3★
AC Infinity Air Filtration Kit 6 CLOUDLINE LITE Inline Fan and Carbon Filter Combo Cooling and Ventilation System for Grow Tents Hydroponics Indoor Gardening
AC Infinity$206.814.7★
AC Infinity CLOUDLINE PRO S4 Quiet 4 Inline Duct Fan with Speed Controller EC Motor Ventilation Exhaust Fan for Heating Cooling Booster Grow Tents Hydroponics
AC Infinity$85.934.7★
What buyers say about 6 inch inline fan
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent Product”
“Good price”
“Easy to hookup”
“Does exactly what it says”
“The clamps are quite sturdy and fancy looking”
“Working well after 2 weeks”
“not noisy”
“Not too heavy easy to instal”
“Easy to use”
“Air flow is good”
What buyers complain about
“Disappointing performance and Durability”
“was way too loud”
“SADLY didn't fit”
“barely functional for its intended job”
“Disappointing performance and Durability”
“the installation felt weird because you need to take out the middle bit to screw down the base”
“Why I don't have a choice of buttons on the machine”
“Parts missing”
“not have these type of issues otherwise there's a lot of less expensive option out there”
“so it's much weaker”
Top return reasons
Common questions
- Is 6 inch inline fan profitable to sell on Amazon United States?
- The niche generates $477K/yr across 23 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +3.2%. Flapen's verdict: Skip it (39/100).
- How competitive is the 6 inch inline fan niche?
- 9 brands and 14 sellers compete. The top 5 products take 62% of clicks and top 5 brands hold 95% of demand.
- What do buyers complain about in 6 inch inline fan?
- Top complaints mined from reviews: Durability, Noise Level, Size-Overall. The return rate is 4.6%.
- When does demand for 6 inch inline fan peak?
- Demand peaks in Dec; the busiest month runs 3.8× the quietest.
- What does it cost to enter the 6 inch inline fan niche?
- Listings span $25.21–$273.63; the average listing price is $84.55 (sweet spot $15–$100). The average incumbent carries 3,385 reviews — the moat a new listing must climb.