VIVOSUN R4 4 Inch 190 CFM Inline Duct Ventilation Fan with Variable Speed Controller for Grow Tent

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!

I just recently (06/25) replaced the fan unit from this kit that I purchased here on Amazon July 26, 2021. The complete kit was on sale for what is normally the price for just the fan - $59.49. From the beginning, the blower unit showed enough vibration that I couldn't use the included wall mount and had to resort to laying it on a cushioning bag of fiberfill on the top of the grow tent as a vibration damper. I needed the clearance inside the enclosure, so although hanging it may (or may not have) transmitted the vibration from the unit through the frame as badly as it did through the wall bracket, it wasn't an option. Laying on the fiberfill, the noise was reduced to a tolerable level, and the unit ran 24/7 at full RPM for just-a-month-shy of a full 4 years. Running the blower with the intake hose removed the imbalance of the impeller and the amount of deflection from centered was clearly visible. Still, there was enough clearance between the red impeller and the venturi that this did not interfere with the function of the unit. At 195 CFM, it has good suction and air could be felt processing through the filter on the exhaust end. However, starting at the beginning of 2025 the fan suffered from reduced RPM / CFM and sounded strained. I regularly clear the intake impeller of any airborne particulates that might accumulate on the impeller blade edges, so I removed the intake venturi and the white center screw to unmount the blade. The blade itself was free of accumulate. The shaft of the motor, on the other hand, was difficult to turn. The motor in question in my July 2021 model does not look like the current depictions that suggest a multi-field induction or EC motor. I recognize the motor as a variant of the type of small wire wound motor that had been used for decades in household refrigerators to circulate the air in and from the freezer. These motors are ideal in a sub-freezing environment as the motors and bearings are literally cooled by the freezer environment. As such they could run for 10-20 years before the bearings run dry or wear - and even then, I have 'resurrected' many that were seized or binding by re-oiling with lightweight synthetic oil at the bearing endcaps. In the case of the VivoSun motor, it was run in non-refrigerated environment. The bearings were thirsty and did bring back the RPMs upon replenishment, but the imbalanced impeller had also worn the actual sleeved bearing and shaft surfaces so that the amount of deflection, now caused the freely spinning fan to strike the inside of the plenum -resulting in chattering at full speed and dramatic vibration at reduced speeds. I have seen a number of others complain about this fan (even as separate from this complete kit). Unless the manufacturer has corrected the balance issue with the red intake impeller, and replaced the refrigerator evaporator style motor with something more substantial, noise / vibration will be an issue along with potential early replacement. I chose to try a 4" Vevor EC motor fan unit for about the same pricepoint and so far it is immediately quieter with no significant vibration. It also uses less than half (23w) of the power of this one (59w). Since I also have extensive experience with major household appliances using EC motors, I know that the motor control circuitry is a weak point so it will remain to be seen if it will outlast the nearly 4 years life of this unit - but it's already worth it in how quietly it moves its 205CFM vs 195 from this noisier unit.

Works good. I have 36in x36x 72in tent. I have it set at lowest setting will increase speed as needed. It's quiet enough for me. I can't hear it threw my walls so that is a bonus.

It passed the 24 hour test, so will be mounting in the flower room. It's a fan moving a lot of air, so yes, it makes a bit of noise. Overall, good fan. A bit bulkier than the iobionics fans. The packaging was minimal, but the fan arrived functional.

Headline: Quiet Powerhouse – Perfect for DIY Solder Fume Extraction Rating: ⭐⭐⭐⭐⭐ I bought this Vivosun 4" (100mm) inline fan for a custom solder fume extraction project, and the performance is impressive. I’m currently running a 6-meter ducting setup (3.5m intake and 2.5m exhaust) and even at just 60% power, the suction is phenomenal. The fan has enough static pressure to draw smoke from a soldering iron easily from 10cm away, even without a hood attached yet. It’s surprisingly quiet for its 190 CFM rating; I can talk over it comfortably while it’s running. The build quality feels solid, and it handles the resistance of long duct runs without stalling or struggling. If you are looking for a capable fan for a workshop or hobby setup where you need high suction without the jet-engine noise, this is the one. Pros: • Extremely quiet operation even at higher speeds. • Strong static pressure—pulls smoke from a distance. • Compact 4-inch size fits standard 100mm flexible ducting perfectly.

I order this online and it been delivered to me today. I got home and set it up the moment I turn it on the moter started to smoke and trip all my plugs at home. This guys are a rip off I must say

Muy mal, plásticos baratos, a bajas revoluciones se acelera solo y hace ruidos extraños, lo devolví. No lo recomiendo

Der Ventilator ist super ,hohe saugkraft und relativ leise, meine Frau ist überglücklich