VIVOSUN R4 4" Inline Duct Ventilation Fan & Speed Controller, Workshop 190 CFM Fan for HVAC, Vent Booster Fan for Grow Tents, Basements, Bathrooms, Kitchens, Attics and 3D Printer

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 purchased this item in hopes it would help reduce or eliminate the fumes from my 3D resin printer while printing. The fumes from my resin printer had fumigated the whole house Even when having the printer in its own room with a window open with a window fan attempting to exhaust the fumes it did not help much. Printing in the winter months was pretty much out of the question. I received this , It was very easy to fit it to my Resin 3D printer. It worked GREAT! I was able to print all weekend without any fume issues at all. I didnt even have to close the crafting room door. ITS amazing. I can now use my printer without stinking up the whole house and giving everyone headaches due to the resin smell. SO the product itself .. IT is heavy duty. looks to be well constructed. The Fan is adjustable and Fairly quiet for its size , I am not sure how much air it draws but Its enough for my needs. The carbon filter is MASSIVE and OMG Its heavy and looks to be GOOD quality, ITs NOT a cheap or flimsy filter. It even came with a nice washable outer cloth filter sleeve. VERY nice and well constructed. IT did a Great job, The price is a little high and almost detoured me from purchasing it but the alternative was to try to make my own exhaust system that might not have worked. OR not use my printer too often. IF you can swallow the price this works GREAT and Im glad I bought it. I just would have liked it more at a slightly lower price.

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.

I needed an inline fan to remove odor from a storage closet and provide airflow. Used this system with the filter on the intake to the inline fan, with the 4" dryer vent line running out of the closet at the top - where I installed a 4" dryer vent flapper valve horizontally. The system works well. The fan controller is variable speed. At MAX speed, you can hear it .... but it's not a distracting level, it's running smoothly, and the odor was gone from the closet (12 feet wide, 3 feet deep by 9 feet high) within an hour of turning the fan on. The fan runs on a timer and is pretty much a 'plug and play' event. Used the two included banjo clamps for the dryer vent line on the exhaust of the fan, and to secure the vent hose to the flapper valve. The filter is a SOLID piece of equipment with no compressibility - that means the hose clamp would not have secured it to the inlet to the air handler. I did NOT 'suspend' filter and air handler ... they sit on a shelf in the closet. I put a piece of duct tape around the filter to fan connection point to stop any air leaks. Supported the filter with a small piece of wood to keep it at the same level as the fan. Works great. How ever you decide to hook it up - remember there is only TWO banjo clamps provided - plan accordingly. I didn't need another one ... I hope someone sells a replacement filter cartridge for this setup.

Installed in-line on a 6-inch HVAC duct to increase airflow to the second floor bedrooms due to too cold in winter/too hot in summer issues. Pros: super easy to install- 45 minutes or less if you’re handy- longer if in a tight or confined space. Very inexpensive fix if you have an upstairs that is too hot/too cold due to poor HVAC volume on upper floors. Cons: really not any. Since sound travels in the ductwork he may consider it loud, however it’s about the same as having a fan running in your room. This is the ideal model if you’re trying to push more air to a bedroom. If you plan to install yourself, buy yourself BOTH left AND right handed tin-snips to cut out the duct work you plan to install it in. Note you can also cut into ductwork with a utility knife, though only recommended for initial cut. Connect the ends with flashing tape to make things easy. I bought this model to duct to all the upstairs bedrooms (4) and now it’s like an icebox up there in the summer. Running our central air no more than before we’ve managed lower the upstairs temperatures by 10 degrees easily- making it so much easier to sleep. I was originally going to upgrade the central air, but that was a multi thousand dollar change – this was in much better solution. Note- install these as close to the blower as possible- ideally right off the trunk line. Also HIGHLY RECOMMENDED- buy and connect to smart plugs that you can control via app or google home/Alexa. That will allow you to easily turn on and off without having to go to the basement every time you want to turn them on/off, and also allows you to set them to a timer through an app so you don’t have to run them all the time. I only run them from 7-9 at night when the A/C begins to cool the house for the evening.

I bought 2 of these kits since I caught one on sale. I do not regret buying either kit. The fan instantly helped me keep my temps and humidity in check in a small room and a 5x5 tent. Even on low the exhaust fan sucks in the walls of my tent (I need to add an inlet fan to fix this). The carbon filter does a great job at keeping the smell down in both the room and the tent. There is literally no smell at all on the other side of the door or tent. The only 2 things I could complain a little about is that the fan is a little loud and they should have included a 3rd hose clamp in the kit. Even on low, there is no way someone is going to walk in a room with your tent and exhaust running and not wonder what the noise is. Overall this is a great kit and well worth the money. Don't expect it to be whisper quiet and pickup an extra 6" hose clamp before you try to install it and I think you'll be very happy with this kit.

I purchased the blower to boost A/C air flow to my upstairs bedroom. instead of putting it in the duct, I simply put it in my bedroom to pull the air. Even though the house has 6" ducts, I purchased the 8" blower to move more air. and it does move the air. I considered buying a second A/C for my bedroom, but this was a cheaper solution and probably better than running a smaller less efficient A/C. I have it on a temp control switch and it works great. I used to have to set the first floor to 68 degrees to get my bedroom to 74. I HATED freezing all summer only to allow my wife to sleep at night. Now, it keeps my bedroom 1-2 degrees cooler than the first floor. it's awesome. However, it is loud. Very loud. Even at the lowest setting it's loud. it's impossible to keep it on when I'm in the room. Even when I'm downstairs, it's loud--although you only really notice how loud when it turns off, and you can enjoy the quiet. Fortunately, cools my bedroom off so well, that when I retire, I simply turn it off for the night. ADDITION 2 YEARS LATER Fan is still working very well. I think it might be slightly less loud.

For the price, you cannot go wrong. I installed this in my basement grow tent which was making my entire house smell. 10 minutes of operation and there is literally no smell. The air coming from the tent smells pure, not a trace of anything at all. The rest of the house even smells better, as I live in an older house with musty basement. (I use hepa/carbon filters on my tent air intakes). The fan creates negative pressure so all air coming out of the tent is going through the filter. My tent is an 8x4, and the walls are sucked in, even at 3/4 speed. You will not regret this purchase.

Muy buen producto, se siente de buena calidad, todo viene bien empaquetado y con instrucciones muy fácil de ensamblar, el ventilador el algo ruidoso, pero funciona excelente.

Rohr Ventilatoren kaufen ist gar nicht mal so einfach. Bei allen steht quasi dabei, sind gut und andere schreiben die seien Müll. Mein ziel war es, eine Absaugmöglichkeit zu schaffen für meinen Werkzeugkeller. Ein Staubsauger zum absaugen ist schön und gut, aber das W/m³ Verhältnis ist eher schlecht. Zudem wird die luft nicht ausgetauscht und ich stehe hier im Keller in meinen Schweißdämpfen. Nicht grade geil. Wie man sehen kann habe ich den Ventilaor mit der beigelegten Wandhalterung montiert (4x 5mm, max 10mm kopf. Nichts inkl. Bei mir 5x60mm Vollgewinde Flachkopf schrauben) Den Fensterflügel habe ich durch eine Sperrholzplatte ersetzt. Die Verarbeitung ist ganz gut. Das Gehäuse und der Impeller sind aus Plastik. Die Materialstärke ist aber relativ dick. Jedenfalls mache ich mir keine Sorgen, dass durch die Schellen das Plastik zerdrückt wird. Die Lautstärke ist ok würde ich sagen. Für mich im Werkezgkeller als Absaugung kein Problem, aber wenn der als Gewächshauslüfter genutzt wird...wäre mir egal wo in meiner wohnung zu laut. Aber von der Materie habe ich keine ahnung, wo man so was aufstellt. Bei dem seperat gekauften Schlauch waren 2 Schellen dabei, beim Motor oder den Trichtern keine. Nehmt welche die bis 210mm oder mehr gehen, das erleichtert die Montage.

Tip Top, der Filter ist nur ein wenig schwer aber sonnst alles gut

Amazing bang for your buck

Preisgünstig, recht leise und leistungsstark. Der Bereich für den Drehzahlsteller sollte noch etwas weiter nach unten gehen. Praktisch, der Halter mit "Klickverschluss". Erleichtert die Montage.