VIVOSUN Z4 4 Inch Inline Duct Fan, 203 CFM Ventilation Fan with Variable Speed Controller for Grow Tent, Indoor Garden Ventilation, Black

Currently using this fan to vent a 40x40 tent with 1 1500w COB LED light. I have found the fan to be well constructed with a thick metal frame and heavy duty power cord. The speed control is large and easy to adjust providing significant control over the fan speed.The sound is noticeable but not over bearing and I found it comparable to other similar fans. The fan has been in use for 4 weeks and so far I have been happy with the output and the cooling ability of the fan and found it to be a great value.

Great fan, good air flow, plenty of power and not too loud for what you’d expect.

This 203cfm metal housing fan isn’t all that quiet but it is definitely more sturdy and less vibration then the plastic housing 190cfm vivosun inline fan. Overall I am pleased with it. The meta housing 203cfm fan weighs more than the plastic 190cfm and will pull down the top horizontal support bar of any indoor grow tent.

It works really good, I'm using it to vent basement workshop fumes and some airborne dust out a dryer vent through the outside wall. It really pushes air. I will say however that 'low' on the variable speed isn't that low. I measured 50 watts running, lowest on high speed. On low speed 57 watts or so. I have it pulling through a 16x20x1 furnace filter in a box enclosure on a 4" dust collector hose. It's not silent, but not what you would call loud either. I wish it could be turned down more i suppose.

Changed my review and rating. This looks really well made and is sturdy. I purchased this in 2017 but did not use it right away. By the time i did use it on a second grow it vibrated so bad it was shaking the house and was very loud. I had used the mounting bracket that came with it and lag bolted it to the rafter to make sure it was secure. Either the bearing is bad or its just so far out of balance that is causing a severe vibration. I took it apart to see if it could be repaired and the weights for balancing on the fan are glued in place and none are missing. I am disappointed to say the least. I did my research and at the time of purchase it had a great rating. It still looks new and has about 100 hours of use. Not worth the money in my opinion for such a short life span .

When I read the other reviews, I was expecting this fan to be much quieter. It would be difficult to have a conversation next to the unit without raising your voice. I'd say it's about as loud as a handheld vacuum. The controls on my unit were wired backwards. This doesn't affect the operation, but it does raise concerns about quality control. The fan moves a TON of air. It could be used as a leaf blower. The construction is very sturdy and neat. Very little vibration, even at full speed. Overall, if you really need to move a lot of air or push it through a lot of duct work, this fan is up to the task, just temper your expectations about the noise.

These fans are like new just dusty. You can easily take these apart and clean them if your handy enough. It'll help prevent gunk buildup, heat, balance issues etc by keeping components inside clean! Think about it guys these fans are spinning thousands of revolutions per/day in usually pretty intense situations like high heat & humidity! These are good for the value but the efficiency is not that great. I personally did switch to AC Infinity products but only because the pricing was similar and the specs were just better with less power consumption. I use the 6" inline fan with the VIVOSUN inline carbon filter in my bedroom still to this day on low to control my smells when I'm lighting up if you will. It works great still... 2 years later... Sooo not bad but the 6" fan uses 125 watts on high and the 4" fan uses like 80 watts on high. Not very good when you compare them to AC Infinity where their same fans for similar pricing and with programming have double the efficiency using 1/3 the electricity!

I bought this for a small grow tent and it's just too much for it. The fan works well and is quiet, but even on the lowest setting, it moves too much air for me. My tent is setup in a cool, dry basement so I need to be able to raise the temps and humidity a bit. With this fan, a humidifier is useless because it circulates the air too often. Even with a a prefilter, lots of bends in the ducting, and operating on the lowest setting, this thing is a beast. It would be perfect for a 2'x4'x5' grow tent if you're running HID in a warm climate, but if you need to maintain a grow room that has a different climate than the intake air provides, find something smaller. I switched to the Terabloom 4" Silent Inline Duct Booster Fan, 47 CFM, and it's perfect for my setup.

Trotz intensivem Einsatz läuft das Teil bis dato sehr gut. Bei uns wird er genutzt um Eishockey-Equipment zu trocknen / zu belüften. Das klappt trotz viel Material ganz hervorragend. Fürs Wohnzimmer wäre mir das Teil zu laut aber im Heizungskeller vollkommen ok und eher etwas leider als ich bei dem Luftumschlag erwartet hätte.

schnelle Lieferung, kraktvoller Lüfter mit gut erträglichem Geräuschpegel.

Nutze den Rohrventilator zusammen mit einem DN110 KG-Rohr um zwei Lasergravuerer abzusagen. Die Laser haben jeweils einen DN75 Anschluss. Die Leistung reicht auf voller Stufe aus um beide gleichzeitig abzusagen. Dabei ist der Ventillator überraschend leise. Wäre in meiner Werkstatt nicht so wichtig, aber ist schon angenehm. In mir eine Kaufempfehlung! Die DN110 Rohre passen leider. Icht perfekt auf den Ventilator. Der Innendurchmesser der Röhre ist 2-3mm zu groß. Ich habe Moosgummiband verwendet um das ganze einigermaßen dicht zu Bekommen.

I just wanted to let everyone know i bought this unit back in 2018, I am still using it right now. I have not continually used since then but i have used it for approximately 6 or 7 grows through flower for marijuana i have always had it hooked to a carbon filter. I am on my second carbon filter with this unit attached I have it on a timer and i have had it set at all the different speeds this way with no problems. The unit works great and does the job for me moves good air and aids the filter to remove the smell from the very stinky flowers of my marijuana. So 6 or 7 runs now of approximately 2 months give or take a week at 12 hours a day it has been running. Right now im half way through another grow and still doing its job with no issues no extra noise. I have only had good experience with this unit and i would recommend to anyone needing a good 4 inch round duct fan to move air for what ever reason u need. Just hook up a dryer hose and move the air. Very easy to use. Im about to buy another one as i just had another model give out i know this one performs. I will stick with this model.

Nicht zu empfehlen, ist leiser als vergleichbare axial Lüfter mit gleichem Durchsatz aber der Motor hat ein lautes laufgergräusch und def Regler regelt fast garnicht. Enttäuschend, bis ich den Motor getauscht habe.