VIVOSUN R6 6 Inch 390 CFM Inline Duct Fan with Variable Speed Controller HVAC Blower for Ventilation

So, I'm using this fan as part of my custom built ventilation system in my basement room converted to a cigar room. I use it to suck the cigar smoke out through the window via the 6 inch hose and some ducting that goes out. I use it in conjunction with a duct fan that's hooked onto the HVAC ducting that acts as an intake fan for the same room.What I like.1. The speed controller comes attached. No need to purchase one separately.2. Durable. I had a mishap where I accidentally dropped it from 7 feet to a concrete floor. No problems, turned it on and fired right up. It's plastic on the outside, but the fan itself has some good heft to it.3. Powerful. This thing cleans out a room fast. You can watch the smoke going from the cigar a good distance away in the room as it goes right to the area of the fan.What I don't like:1. This thing is loud. But, that's the compromise. If you want a proper fan that will do the job, noise will be on the table. That all said, it's not loud enough to drown out conversation or music on a small speaker in the room. Further, it's powerful enough to run on low and still keep the room clear with one or two cigar smokers.In all, this being part of my ventilation system saved me hundreds of dollars by not buying a rabbit, or any other overpriced smoke eater. Good price, quality fan.

I’m thoroughly impressed with the VIVOSUN Variable Speed Inline Duct Fan! From the moment I set it up, it was clear that this fan is built for performance. The brushless motor and durable plastic blades make it not only efficient but also incredibly quiet—at 34 dB, it’s nearly silent while running. Whether you're using it in an industrial, household, or horticultural setting, it delivers optimal airflow, reaching up to 390 CFM.One feature I love is the stepless speed controller on the power cord. It gives me full control to adjust the airflow and noise level, so I can tailor it to my needs. The compact design (measuring only 8.7 x 11.8 x 8.7 inches) fits perfectly into tight spaces, and installation was a breeze thanks to the included bracket and removable duct ends.This fan is incredibly versatile and does the job exceptionally well. If you're looking for a reliable, efficient, and quiet ventilation solution, I highly recommend this product. It’s the perfect addition to any ventilation system!

*Updated Review*After my initial review (see below), Vivosun contacted me and offered to send a free replacement. I took them up on their offer to give it another try. I did order a replacement fan that is super quiet and works great after this try, which is what I had been using. However, I was willing to give this one a try to see if maybe I did just get a bum unit.I got the new unit and plugged it in. It's definitely not as whiny as the original one, but still quite a bit louder than the other one I got (AC Cloudline Infinity). That one is also 2x the cost, but if you need silence is worth it.Overall I think this one is OK if you're on a budget and don't mind a little noise. If you have the coin and need things as quite as possible - look elsewhere.I did update from 1 star to 4 stars because of how well the customer service has been. This is still, at best, a 3 star product compared to other options.I set up a grow tent this year for starting seeds indoors before transplanting into the garden. I wanted an exhaust fan to be able to vent in fresh air to ensure air flow and good photosynthesis. I purchased a Vivosun tent and was generally satisfied, so purchased this fan to go with it.I received it and everything seemed pretty high quality at first glance. I got it installed and turned it on only to be greeted by this awful, loud, high pitched whine. Didn't matter the setting, didn't matter if it was connected to the filter, consistent loud whine.To its credit, it did seem like it moved a decent amount of air. If I had this out in a shop or in an attic it would probably be fine. But for indoors in a house, absolutely not. No way I could work from home with this torturous, piercing sound in the background.I ended up returning it and replaced it with an AC Infinity Cloudline fan. That fan w/o the filter was as much as this combo, but it's dead silent.Not sure if I got a defective one, or if that's just a price you pay for this cheaper version. But if silence matters, spend the coin for a better one.

This is my second setup like this and while I liked my old Ventech one better, this is still fair quality and does the job.Assembly is slightly more difficult than other models. I worry about durability with the inline fan, but this is a lot of value for the money.