VIVOSUN 4-Inch 203 CFM Inline Duct Fan for Improved Airflow in Home and Office

jeffjeff: Installed in my HVAC system to increase flow to a remote part of my house. I Installed a pressure switch that gets its signal from the furnace air plenum so when the furnace blower comes on, the inline fan comes on, and when the blower goes off, the fan automatically stops. See picture. Has been working great for over 6 years now.

United States on Nov 30, 2023

peter a.: I have not done anything more than power them up to try but they are pretty quiet, powerful and very sturdy looking devices. I will use them for air ventilation in my basement so they will run periodically all year. I'll update if they fail prematurely or something but preliminary opinion is very good value for money and look well built.

Only one minor complaint is that the speed control does not go low enough. It will lower the output by about say 25% but won't go to say 50% or 75%. Not a huge issue but slightly annoying.

Canada on Nov 18, 2023

Robert Knight: I bought this awhile ago and needed to test this out before a review... Over all has great airflow and is loud but what fan isnt lol... Does a great job. Had it going non stop for awhile and it keeps going... Very good product and would recommend this for sure

Canada on Nov 03, 2023

Pierre Desnoyers: Fan de cuisine

Canada on Oct 17, 2023

AlbertAlbert:

Canada on Oct 13, 2023

firrox: Works great, not very loud, not the strongest but for it's price it's hard to beat. Had it in a tent for a year and a half and still use it during hot months and no problems over 3 years later

United States on Aug 27, 2023

B. Quinn: Been running a full year, nonstop, at about medium speed, zero problems. I have done no maintenance. It moves a lot of air. It's kind of loud, but I can't compare loudness to other fans of the same size. When it was in my living room it was too loud. It's in my bedroom now not far from my bed and that doesn't bother me.

I am mining in a grow tent in a small 1br apartment and this ventilation solution has allowed me to max out my apartment electrical grid and keep quite an oversized (for my living situation) mining operation going. I have a smaller intake fan by the same brand, a different model, and with the two fans I circulate the outside air through my tent (both intake and exhaust tubes hang out the window), so that it does not affect the air pressure in my apartment.

It was really drafty when I was either sucking air in, or blowing it out. I thought I was getting the Korean Fan Death, my mouth would be soooooooo dried out every morning because my bedroom had like low air pressure. So keep in mind if you are exhausting hot air outdoors, that creates an air pressure gradient with other impacts.

I built an audio dampening box out of foam and wood to enclose...

United States on Jul 03, 2022

Kai: I decided to buy a less than new (read "good") item as it was sold and shipped from amazon and the description stated light cosmetic issues less than an inch on the outside in it's original packaging for fifteen dollars cheaper than brand new. The item came exactly as described and to my surprise actually had no actual damage on the product itself but the original packaging was slightly damaged and I think Amazon was just trying to cover themselves just in case. Item worked perfectly and was very quiet given the amount of air it was pushing. I use it for my spray booth to pull toxic fumes as well as organic material from overspray and it does what I need beautifully. The only gripe to mention is I did experience the so called noise that came after about an hour of breaking in. It is a soft knock obviously from a blade that probably wasn't machined exactly perfect that I'll probably try to fix st some point. The noise isn't constantly present but is rhythmic (obviously) seeming to get worse over time (again obviously) Still no regrets with the purchase and recommend.

United States on Jan 21, 2021

Voshamani: Well after 1 day of use I feel I can write this review while making some valid points.

Pros:
- Not to noisy as others suggested. I have used well over 15 different types and brands of inline fans and out of a scale of 1 to 10. 1 being silence and 10 being a bomb going off, I would rate this fan at around a 2 for noise level.
- Powerful! This 8 inch inline fan is powerful. Much Much more powerful than others that I have used. Powerful enough to hold a thick 8 inch by 10 inch piece of cardboard to the filter with the amount of suction / power it has.

Cons:
- There is no speed control on the power cord. Almost every other brand and type of inline fan I have used they all had a speed control. This one dont.
- It is very short (length wise) so if you are looking to hang this unit from the ceiling you will have to Macgyver up some sort of contraption to get this unit to hang.
- and last but not least and MOST IMPORTANTLY.... the lip on the end where it will suck from which would be the end that your filter would attach to it way way way way to small. It is literially 1 inch to 1.5 inch. There is absolutely no way at all to get your filter on to where you can...

Canada on Nov 09, 2020

John: i used this for dozens of different applications including funneling large amounts of hot air, venting toxic fumes, a window fan in the summer, and now i use it for an air filtration box. Ive had this thing for over a year and its an incredibly versatile tool. easily gets a 5 star! im planning an upgrade of the speed dial to see if i can get it to spin slower on the lowest setting. I also want to take it apart and inspect the bearing and see it it can be replaced. although it works fine and isnt that loud so i haven't yet. i just think if its an easy swap that it would make a big difference. definitely an extremely durable product and im very very happy with it.
as for performance; it moves a ton of air. its not loud and exceeded my expectations in how long it lasts without problems or breaking. still going strong and ive never had to repair it.
it currently sits on a purpose built shelf in my home office attached to a 12"x12" filter box that you can buy at a hydroponics shop. i modified it to take a premium HEPA air filter and sealed it with air conditioning foam insulation adhesive strips. It can filter the whole rooms volume of air in about a minute at full speed and i...

United States on Apr 15, 2019