Review on 🌱 VIVOSUN 4 Inch 203 CFM ETL Certified Inline Duct Fan: Efficient Ventilation for Your Grow Tent by Whitney Starvaggi

Bought one of these units and the fan started making a loud squeak and roar. The block was replaced and less than 2 months passed again, the same started with the replacement. I can highly recommend another duct fan. ``Upgrade``` Vivosun personally refunded me a replacement fan that was starting to crack. I've bought a lot from them in the past and these particular items are the only ones I've ever had problems with. Their customer service is top notch and they will fix any problems their customers may encounter. However, I would recommend a different fan than this unit.