--- title: "4 inch carbon filter — Niche Verdict: Skip it (37/100) | Amazon United States - Flapen" canonical_url: "https://flapen.com/amazon/research/us/patio-lawn-garden/4-inch-carbon-filter" last_updated: "2026-07-09T23:05:48.202Z" locale: en meta: description: "a small market ($55K/yr) — 4 inch carbon filter doesn't clear our bar today." "og:description": "a small market ($55K/yr) — 4 inch carbon filter doesn't clear our bar today." "og:title": "4 inch carbon filter — Niche Verdict: Skip it (37/100) | Amazon United States - Flapen" --- Back to Flapen home # **4 inch carbon filter** **Skip it****37/100 ** a small market ($55K/yr) — 4 inch carbon filter doesn't clear our bar today. **Market/yr** **$55K** **Growth (1y)** **+98.5%** **Products** **14** **Brands** **9** was 12 a year ago **Sellers** **11** **Price range** **$16.06–$89.42** **Returns** **2.4%** **Rating** **4.5★** **Skip it** Scored 37/100 across market size, growth, competition, quality gap, and returns. Market sizeGrowthCompetitionQuality gapReturns Market size **3** ×0.30 Growth **65** ×0.30 Competition **25** ×0.20 Quality gap **38** ×0.10 Returns **81** ×0.10 ## **Demand** Weekly Amazon search volume, last 104 weeks — +98.5% year over year. 917458.5Holiday '24Spike '25Black Friday '25Jul '24Nov '24Mar '25Jul '25Nov '25Mar '26 ## **Seasonality** Monthly demand index across the year — 1.00 is average. JFMAMJJASOND No pronounced peak months · busiest ÷ quietest = 1.5× ## **Competition** - VIVOSUN33% - vanleno18% - MELONFARM14% - ATOUR13% - AC Infinity12% - HYDROWE4% - Other (3 brands)6% The top 5 products capture 73% of clicks — a locked-up shelf that new listings rarely crack. 9 brands and 11 sellers compete here. **Brands** **9 **▼falling was 12 a year ago **Sellers** **11** **Top 5 brand share** **90%** #ProductBrandPriceRatingReviewsClick shareTrend 1 ![VIVOSUN 4 Inch Air Carbon Filter Smellines Control with Australia Virgin Charcoal for Inline Duct Fan Grow Tent Pre-filter Included Reversible Flange 4 x 12](https://m.media-amazon.com/images/I/51W0QL6yCLL.jpg) [**VIVOSUN 4 Inch Air Carbon Filter Smellines Control with Australia Virgin Charcoal for Inline Duct Fan Grow Tent Pre-filter Included Reversible Flange 4 x 12**](https://www.amazon.com/dp/B01DXYMBU6) VIVOSUN$38.044.6★10,04424%▲rising 2 ![vanleno 4inch Carbon Filter Odor Control with Australia Virgin Charcoal Two Prefilter 1 Pair Rope Hanger Included for Inline Duct Fan Grow Tent Hydroponics Odor Scrubber](https://m.media-amazon.com/images/I/51eVGVYG9LL.jpg) [**vanleno 4inch Carbon Filter Odor Control with Australia Virgin Charcoal Two Prefilter 1 Pair Rope Hanger Included for Inline Duct Fan Grow Tent Hydroponics Odor Scrubber**](https://www.amazon.com/dp/B085DMC2LX) vanleno$30.354.6★2,93518%▲rising 3 ![MELONFARM 4 Inch Air Carbon Filter Smelliness Control with Australia Virgin Charcoal Odor Removal Carbon Filter for Grow Tent Inline Fan Hydroponics Pre-Filter Included Insulated Flange 4 x 11](https://m.media-amazon.com/images/I/41NundYPZrL.jpg) [**MELONFARM 4 Inch Air Carbon Filter Smelliness Control with Australia Virgin Charcoal Odor Removal Carbon Filter for Grow Tent Inline Fan Hydroponics Pre-Filter Included Insulated Flange 4 x 11**](https://www.amazon.com/dp/B0C84QNZ4L) MELONFARM$28.794.4★75011%▼falling 4 ![ATOUR 4 Air Carbon Filter with Australian Virgin Charcoal Superior Odor Control for Grow Tent Smelliniss Scrubber Inline Fans Hydroponics. Includes Pre-Filter & Insulated Flange 4x11](https://m.media-amazon.com/images/I/41itXDzeGzL.jpg) [**ATOUR 4 Air Carbon Filter with Australian Virgin Charcoal Superior Odor Control for Grow Tent Smelliniss Scrubber Inline Fans Hydroponics. Includes Pre-Filter & Insulated Flange 4x11**](https://www.amazon.com/dp/B0FC27ZD36) ATOUR$28.144.6★1810%▲rising 5 ![AC Infinity Air Carbon Filter 4 with Premium Australian Virgin Charcoal for Inline Duct Fan Odor Control Hydroponics Grow Rooms](https://m.media-amazon.com/images/I/41JoISd6OfL.jpg) [**AC Infinity Air Carbon Filter 4 with Premium Australian Virgin Charcoal for Inline Duct Fan Odor Control Hydroponics Grow Rooms**](https://www.amazon.com/dp/B07GSKFBL8) AC Infinity$49.654.8★10,22410%▼falling 6 ![VIVOSUN 4 Inch Air Carbon Filter Smelliness Control with Australia Virgin Charcoal for Inline Fan Grow Tent Smelliness Scrubber Pre-Filter Included Reversible Flange 4 x 12 Black](https://m.media-amazon.com/images/I/51Y5lyI03gL.jpg) [**VIVOSUN 4 Inch Air Carbon Filter Smelliness Control with Australia Virgin Charcoal for Inline Fan Grow Tent Smelliness Scrubber Pre-Filter Included Reversible Flange 4 x 12 Black**](https://www.amazon.com/dp/B08M3G5TH3) VIVOSUN$39.794.6★1,6439%▲rising 7 ![HYDROWE Air Carbon Filter 4 Inch Smellines Control Removes 3X More Odors Contaminants. Australian Virgin Charcoal Carbon Filter for Grow Tent Hydroponics Pre-Filter Included (4inch)](https://m.media-amazon.com/images/I/51fBO0isf-L.jpg) [**HYDROWE Air Carbon Filter 4 Inch Smellines Control Removes 3X More Odors Contaminants. Australian Virgin Charcoal Carbon Filter for Grow Tent Hydroponics Pre-Filter Included (4inch)**](https://www.amazon.com/dp/B09MK771D4) HYDROWE$29.264.5★3384%▼falling 8 ![Air Duct Screen and Carbon Filter for 4 inch Air Ducts Vents Grow tents or fresh air intakes; Pre-filtration for light duty odors and dust; Atomic Innovations](https://m.media-amazon.com/images/I/41sawFQhggL.jpg) [**Air Duct Screen and Carbon Filter for 4 inch Air Ducts Vents Grow tents or fresh air intakes; Pre-filtration for light duty odors and dust; Atomic Innovations**](https://www.amazon.com/dp/B081QW6R88) Atomic Innovations$16.064.4★6533%▼falling 9 ![AC Infinity Refillable Carbon Filter Kit 4 with Additional Refill Odor Removal Air Scrubber For 4 Inline Fan and Ducting Reusable Charcoal Filter for Grow Tent Grow Room Hydroponics](https://m.media-amazon.com/images/I/41uh+NarhNL.jpg) [**AC Infinity Refillable Carbon Filter Kit 4 with Additional Refill Odor Removal Air Scrubber For 4 Inline Fan and Ducting Reusable Charcoal Filter for Grow Tent Grow Room Hydroponics**](https://www.amazon.com/dp/B0CFBM7JKT) AC Infinity$89.424.7★4952%▼falling 10 ![ATOUR 4 Inch Air Carbon Filter with Australian Virgin Charcoal Odor Control. Built-in 5.5 Quiet Fan with Speed Control for Inline Duct Fans & Grow Tents. Includes Vent Cover + Pre-Filter 4x13.4](https://m.media-amazon.com/images/I/41zo3B0coAL.jpg) [**ATOUR 4 Inch Air Carbon Filter with Australian Virgin Charcoal Odor Control. Built-in 5.5 Quiet Fan with Speed Control for Inline Duct Fans & Grow Tents. Includes Vent Cover + Pre-Filter 4x13.4**](https://www.amazon.com/dp/B0FC26Q61Y) ATOUR$41.454.2★632%▲rising 11 ![Spider Farmer 4 Inch Air Carbon Filrer Smelliness Control with Premium Australia Virgin Charcoal for Inline Duct Fan Grow Tent Odor Control Hydroponics Pre-Filter Included Reversible Flange](https://m.media-amazon.com/images/I/41-1zWUt9GL.jpg) [**Spider Farmer 4 Inch Air Carbon Filrer Smelliness Control with Premium Australia Virgin Charcoal for Inline Duct Fan Grow Tent Odor Control Hydroponics Pre-Filter Included Reversible Flange**](https://www.amazon.com/dp/B09MTDFBPS) Spider Farmer$44.784.4★4012%▲rising 12 ![MELONFARM 4 inch Air Carbon Filter Smelliness Control with Australia Virgin Charcoal Built-in 14cm Fan Low Nois and Speed Controller Smelliness Scrubber for Inline Duct Fan Grow Tent 4 x 12.6](https://m.media-amazon.com/images/I/515YHbx2iCL.jpg) [**MELONFARM 4 inch Air Carbon Filter Smelliness Control with Australia Virgin Charcoal Built-in 14cm Fan Low Nois and Speed Controller Smelliness Scrubber for Inline Duct Fan Grow Tent 4 x 12.6**](https://www.amazon.com/dp/B0CF8VPCHM) MELONFARM$43.664.4★7502%—flat 13 ![MELONFARM 4 Inch Air Carbon Filter Smelliness Control with Australia Virgin Charcoal Odor Removal for Grow Tent Inline Fan 8 Ducting Cooling & Vent Cover Included Insulated Flange 4 x 11](https://m.media-amazon.com/images/I/41u0i5i1muL.jpg) [**MELONFARM 4 Inch Air Carbon Filter Smelliness Control with Australia Virgin Charcoal Odor Removal for Grow Tent Inline Fan 8 Ducting Cooling & Vent Cover Included Insulated Flange 4 x 11**](https://www.amazon.com/dp/B0FBWH57P8) MELONFARM$37.094.1★82%▲rising 14 ![Carbon Filter 4 with Premium Australian Virgin Charcoal Grow Rooms Reusable Charcoal Filter for Grow Tent Grow Room Hydroponics for Inline Duct Fan (Diameter 4 inches - Length 10 inches)](https://m.media-amazon.com/images/I/31t1AWEdgdL.jpg) [**Carbon Filter 4 with Premium Australian Virgin Charcoal Grow Rooms Reusable Charcoal Filter for Grow Tent Grow Room Hydroponics for Inline Duct Fan (Diameter 4 inches - Length 10 inches)**](https://www.amazon.com/dp/B0GS16V9PZ) GROW BUDDY$29.915.0★11%▲rising ## **Product shelf** All 14 tracked products in this niche. Top sellersNewestTrending [![VIVOSUN 4 Inch Air Carbon Filter Smellines Control with Australia Virgin Charcoal for Inline Duct Fan Grow Tent Pre-filter Included Reversible Flange 4 x 12](https://m.media-amazon.com/images/I/51W0QL6yCLL.jpg)**VIVOSUN 4 Inch Air Carbon Filter Smellines Control with Australia Virgin Charcoal for Inline Duct Fan Grow Tent Pre-filter Included Reversible Flange 4 x 12** VIVOSUN**$38.04**4.6★10,044 reviews](https://www.amazon.com/dp/B01DXYMBU6) [![vanleno 4inch Carbon Filter Odor Control with Australia Virgin Charcoal Two Prefilter 1 Pair Rope Hanger Included for Inline Duct Fan Grow Tent Hydroponics Odor Scrubber](https://m.media-amazon.com/images/I/51eVGVYG9LL.jpg)**vanleno 4inch Carbon Filter Odor Control with Australia Virgin Charcoal Two Prefilter 1 Pair Rope Hanger Included for Inline Duct Fan Grow Tent Hydroponics Odor Scrubber** vanleno**$30.35**4.6★2,935 reviews](https://www.amazon.com/dp/B085DMC2LX) [![MELONFARM 4 Inch Air Carbon Filter Smelliness Control with Australia Virgin Charcoal Odor Removal Carbon Filter for Grow Tent Inline Fan Hydroponics Pre-Filter Included Insulated Flange 4 x 11](https://m.media-amazon.com/images/I/41NundYPZrL.jpg)**MELONFARM 4 Inch Air Carbon Filter Smelliness Control with Australia Virgin Charcoal Odor Removal Carbon Filter for Grow Tent Inline Fan Hydroponics Pre-Filter Included Insulated Flange 4 x 11** MELONFARM**$28.79**4.4★750 reviews](https://www.amazon.com/dp/B0C84QNZ4L) [![ATOUR 4 Air Carbon Filter with Australian Virgin Charcoal Superior Odor Control for Grow Tent Smelliniss Scrubber Inline Fans Hydroponics. Includes Pre-Filter & Insulated Flange 4x11](https://m.media-amazon.com/images/I/41itXDzeGzL.jpg)**ATOUR 4 Air Carbon Filter with Australian Virgin Charcoal Superior Odor Control for Grow Tent Smelliniss Scrubber Inline Fans Hydroponics. Includes Pre-Filter & Insulated Flange 4x11** ATOUR**$28.14**4.6★18 reviews](https://www.amazon.com/dp/B0FC27ZD36) [![AC Infinity Air Carbon Filter 4 with Premium Australian Virgin Charcoal for Inline Duct Fan Odor Control Hydroponics Grow Rooms](https://m.media-amazon.com/images/I/41JoISd6OfL.jpg)**AC Infinity Air Carbon Filter 4 with Premium Australian Virgin Charcoal for Inline Duct Fan Odor Control Hydroponics Grow Rooms** AC Infinity**$49.65**4.8★10,224 reviews](https://www.amazon.com/dp/B07GSKFBL8) [![VIVOSUN 4 Inch Air Carbon Filter Smelliness Control with Australia Virgin Charcoal for Inline Fan Grow Tent Smelliness Scrubber Pre-Filter Included Reversible Flange 4 x 12 Black](https://m.media-amazon.com/images/I/51Y5lyI03gL.jpg)**VIVOSUN 4 Inch Air Carbon Filter Smelliness Control with Australia Virgin Charcoal for Inline Fan Grow Tent Smelliness Scrubber Pre-Filter Included Reversible Flange 4 x 12 Black** VIVOSUN**$39.79**4.6★1,643 reviews](https://www.amazon.com/dp/B08M3G5TH3) [![HYDROWE Air Carbon Filter 4 Inch Smellines Control Removes 3X More Odors Contaminants. Australian Virgin Charcoal Carbon Filter for Grow Tent Hydroponics Pre-Filter Included (4inch)](https://m.media-amazon.com/images/I/51fBO0isf-L.jpg)**HYDROWE Air Carbon Filter 4 Inch Smellines Control Removes 3X More Odors Contaminants. Australian Virgin Charcoal Carbon Filter for Grow Tent Hydroponics Pre-Filter Included (4inch)** HYDROWE**$29.26**4.5★338 reviews](https://www.amazon.com/dp/B09MK771D4) [![Air Duct Screen and Carbon Filter for 4 inch Air Ducts Vents Grow tents or fresh air intakes; Pre-filtration for light duty odors and dust; Atomic Innovations](https://m.media-amazon.com/images/I/41sawFQhggL.jpg)**Air Duct Screen and Carbon Filter for 4 inch Air Ducts Vents Grow tents or fresh air intakes; Pre-filtration for light duty odors and dust; Atomic Innovations** Atomic Innovations**$16.06**4.4★653 reviews](https://www.amazon.com/dp/B081QW6R88) ## **Reviews** What buyers praise and complain about, mined from review topics. ### **What buyers love ** **Smell**27% *“No odor”* **Quality-Overall**14% *“The quality is really good”* **Value For Money**11% *“Amazing value for the quality you get”* **Advertised Vs Actual Product**11% *“Works as described”* **Filtration**10% *“Good filter”* **Size-Overall**5% *“It's a good size”* **Ease Of Use**4% *“Many uses”* **Strength**3% *“Seems sturdy for a good price and easily installed”* **Assembly/Installation**3% *“easily installed”* **Refills-Overall**2% *“Useful refill kit”* ### **What buyers complain about ** **Smell**18% *“so those chemical smells don't stand a chance of taking over the room”* **Filtration**14% *“Not a big fan of the pre filters”* **Refills-Overall**12% *“Doesnt work once refilled”* **Quality-Overall**11% *“Garbage”* **Durability**8% *“Doesnt last long at all”* **Scratch Resistance**6% *“Dented up”* **Functionality-Overall**6% *“The last one I bought is not working at all”* **Size-Overall**3% *“Too small”* **Charging**3% *“all the big names are copying their idead and charging double”* **Ease Of Cleaning**2% *“messy”* #### **Top return reasons**- Size-Overall49% - Filtration13% - Functionality-Overall9% - Advertised Vs Actual Product8% - Compatibility-Overall3% - Smell3% - Value For Money2% - Leak-Proof2% - Product Condition2% - Defective Material/Parts1%