VIVOSUN 4" Metal Inline Fan 100 CFM, Exhaust Fan for Home Ventilation

The VIVOSUN 4 Inch Inline Duct Fan with 100 CFM is an absolute must-have if you own a Keystone RV, especially models like the Avalanche 390DS. The lack of proper airflow in the HVAC system of these RVs, particularly in the rear bedroom, can make it unbearably hot. Keystone's quality control issues only add to the frustration. Installing this ventilation fan was straightforward, and the difference in airflow is night and day. The rear bedroom now receives proper air circulation, making it comfortable even on hot days. The fan operates quietly, which is a bonus, ensuring that it doesn't disturb your peace. For anyone dealing with similar HVAC issues in their Keystone RV, I highly recommend the VIVOSUN Inline Duct Fan. It's a reliable solution to prevent overheating and improve overall comfort. 🌬️🚐❄️

I used this fan along with an old kitchen vent hood to make a ventilation fan for my workshop. It was easy to install inline, and I wired it up to a switched outlet. Now, when I do woodworking or painting in the shop, the dust and fumes are drawn through a common furnace filter and vented outside. Although the volume of air moved is not great, it does help keep the air cleaner, without generating excessive noise.

The fans work fine, but because they are low CFM, they won't open my butterfly dampers. I had to step up to stronger fans. These aren't terribly noisy, so if you aren't using dampers that require air flow to open, they're a good, affordable choice.

Fan is holding up great! Bought it to cool my metal shed, have it on a timer.

Doesn't provide enough static pressure to open a back draft damper. Its probably ok for basic flow, not my use case though.

Works great. I’ve bought several of these. One failed after several months of 24/7 use, but the others have been running 24/7 for over a year with no issues.

Lasted 1 day. I was impressed by its performance when i tested it before installing. Unfortunately it stopped working the same day i installed it.

I got this to vent my cats' enclosed litter box out through the roof. It has a smaller diameter than standard 4" metal ducting (I'm a solar/hvac installer, so I know what 4" standard metal duct is), so I needed to put a couple of crimps on my duct to get it a bit closer to this fan's outer dimensions for a better fit. It may be closer if you're using flexible ducting, but I didnt use any of that. The noise level is okay, it is audible from the litter box, but it hasn't kept the cats away. I used a vent quick-release adapter on the end of the ducting. The litter box is a large rubbermaid tote, which was much cheaper than even a small litter box, and easily modified to allow the cats entry, and slide over the vent adapter. I'm going to be running it 24/7, so I hope the durability is good. I will update again if it fails. It has effectively eliminated any of the urine odor from the laundry room, and the litter has been drying out faster after use.

This is a very well built fan unit with quite a hefty motor in it well protected from any smoke, oil, or debris that may be channeling through with the exhaust. There is no switch, it's just a straight 6ft cord, but nice and heavy. It is very quiet, nothing lose, no rattling, and you can barely hear the motor. If you are wondering how much push is 100cfm its not a forceful stream but a steady noticeable flow about the same as a computer fan (60-100cfm) or one of those small fans you might have on your desk (ie it won't blow stuff off your desk). Great price, fast delivery, plenty of air and nice and quiet.. all around a good deal. I'm using it for a range hood and its perfect Thanks

Funciona bien pero para mi filtro de carbono que para eso lo uso le falto potencia dw cmf pero bueno sirve para lo que es pedido

Purchased to exhaust air from a small indoor grow space. 100cfh is not much. It works for my 8' square room, but it took about 2-3 days to get my humidity down to a manageable level. Now it keeps up nicely. Would not recommend for a space much bigger than this. There are 200cfh fans for $10 more on here and they'd be worth it. This unit is VERY quiet as it is low cfh.

Desde que lo instale, m problema de ventilación quedó resuelto, muy buen servicio hasta la fecha.

Lamentablemente no extrae nada de aire. Es muy debil y tuve que adquirir otro distinto