TURBRO AirSupply ES4 4 Inch Inline Duct Fan, 195 CFM Energy Efficient Exhaust Fan with Variable Speed Controlled EC Motor for Grow Tents, Hydroponics, Industrial and Residential Ventilation

I bought my unit for ventilating a basement. After about 2 months of continuous use, it stopped working for seemingly no reason. It was past amazon's return period, so I contacted Turbro's support. They sent me a new unit the very next day! I'm back up and running no problem. this thing can move a TON of air. And while it's not super quiet at the max speed, it's very reasonable. I keep it at a relatively slow speed, so it's pretty dang quiet for me. As long as this replacement unit holds up, I'll keep this as a 5 star review. If the new one dies like the old one did, I will likely update it.

Fantastic fan. Moves a lot of air. The speed adjustment works smoothly. I've had one running continuously for over two years and it's still going strong. Nice and quiet too.

Works good. Good craftmanship.

This fan is fantastic, 1st. its small, the size of a mayonnaise jar. 2nd. one piece aluminum housing. 3rd. set at 15% power, the exhaust side air made my wife's hair move from 8ft away. 4th. at 15% barely hear motor running, i walked away from it, forgot it was on. at 100%, it blew all the papers off my table from 8ft away. yes at 100% it is loud, but when you see and feel the power this little mayonnaise jar sized fan has, you will say holy crap!! The plastic bodied exhaust fan that i replaced is a popular name brand, i was running the old fan at 75% and the 2x4 grow tent was still hovering close to 90 degrees. i would have turned the fan to 100% but at 75% i could hear fan from another room across the hall. I had to put my hand over the exhaust port on the outside of the tent to make sure that the old fan was exhausting properly:( This little 4" fan will do the job better than the name brand 6" fans and i bet it would give most 8" fans a run for their money. 5th. the controller is small 1.5 inches x 2inches, compare that to the popular 4x4 inch competitor controllers. So when you compare cost of unit, air movement, quietness, cost of operation, the 4 inch turbo exhaust fan cant be beat. For tents larger than 6ftX6ft, Turbo Exhaust Fans come in 6 inch and 8 inch sizes. The only negative i could see is the controller power cord end plugs. Both plug ends have a 3 pin male/female connection. The connection is a tight fit, the power cord plug pins could get bent if you are not careful plugging the controller power cord into the fan and the controller. Be careful! I hope this review was informative.

At highest rpm is a little noisy but I'm running only .5 of maximum rpm so is OK.

used for a radon mitigation system , very quiet compared to an ac motor fan, has been running 24/7 for almost a year now with no problems

Very pleased. Have installed a handful of these, and everyone is happy. Very quiet. An above-standard system.

I purchased the TURBRO AirSupply ES4 inline duct fan for a Laser system I am setting up. While it offers some commendable features, I found a few aspects that gave me pause. On the positive side, the fan includes a variable dial controller, a feature that adds versatility and control over its operation. Moreover, the housing crafted from aluminum rather than plastic provides a sense of durability and sturdiness. However, the price of the TURBRO AirSupply ES4 is quite high compared to its competitors. Given the cost, I expected a higher cubic feet per minute (CFM) output, but it falls slightly short in this aspect when compared to rival products available at a similar price point, notability AC Infinity. One aspect that I found slightly disappointing was the noise level, particularly at maximum speed. While the product claims a max noise level of 37 dB, I found the fan to be louder than anticipated, though it might be subjective and depend on personal tolerance levels. Comparing it with the AC Infinity CLOUDLINE PRO T4, the TURBRO AirSupply ES4 somewhat managed to keep up in terms of performance. However, the aesthetics of the TURBRO AirSupply ES4 didn't quite match up to my expectations. The appearance was not as pleasing as I had hoped, although my decision to opt for this fan was primarily driven by its required location in the inline system.

Seller has a 2 year warranty , poof seller is gone from amazon, so is the warranty. Amazon sorry you are out of luck.