VIVOSUN Inline Duct Fan 100 mm (4 Inch) 345 m³h with Variable Speed Control for Grow Tent, Ventilation, Plant Tent, Indoor, Garden, Ventilation Fan, Z4 Pipe Fan, Black

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.

I used this product without problems for about a year as part of an air circulating system in my house. However in the last few weeks it started squealing and making horrible noises so I disassembled it to see why. One of the bearings has failed and the motor shaft is rusty where the bearing inner race goes. The duct they were used in was dry, no water, no dirt or dust so no real reason for a failure. Other units (NuTone) have lasted for 10's of years with no noises or failures. Oh well ... live and learn.

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.

This is the second fan I purchased from Vivosun the same issue occurred with both fans. The bearings on the motor main shaft failed. I ordered a backup from another source so my crop didn’t fail but this fan is completely unreliable. They have great grow tents and filters but this fan is just plain poor craftsmanship and parts. This needs a refund so I may source another brand. so once again the same bearings went out but the customer service dept came through and made sure i was taken care of. i changed the rating to 3 stars but this is for the fan only, the rest of the equipment i got from Vivosun is awesome, the tent and filter did a great job and my harvest yield was super and high quality. i out sourced a different fan but i use the fan externally and it caused no interruption in my process. the attention to the customer for this company is better than i could have expected. thumbs up guys

I got this fan for my 4'x4' grow tent (also a Vivosun purchase) and it is just amazing, perfect for my use. Then only a few months later it started knocking quite loudly, upon emailing Vivosun directly they issued me a full refund immediately so I could purchase another as it was the quickest way for me to get it. I will now buy all my items needed from Vivosun as you can't go wrong with a company that provides this level of service.