VIVOSUN D4 4 Inch 195 CFM Inline Duct Ventilation Fan HVAC Vent Blower for Hydroponics Grow Tent

This is a solid fan. The last one I bought had good air flow, was reasonably quiet and lasted 5 years. Not a fancy option but solid and I just bought my second one.

Using this pump to evacuate resin fumes from a grow box, makes staying in the same room fine until the door is opened, so it must be enough to create negative pressure for a 2x3x4ft cube.Not very loud, about as loud as a box fan on medium. Overall ticks all the boxes I needed, been running 24/7 for a few weeks now.

Works well, LOUDER THAN ADVERTISED. The 28 decibels that are claimed is going to be on the lowest possible speed. From what I understand that is industry standard for reporting sound, but don't think that you're going to get there rated CFM at an amount of noise that is unnoticeable. You can talk over it at the rated CFM, but 28db is misleading. Still, moves the warm air as needed. I've bought this brand before, and will do so again when needed.

I use this in combination with a VivoSun 4 inch carbon filter to eliminate the smells from my plant tent. the air flow is really good although not adjustable. installation is super easy and the build quality is amazing. it both cleans the air and cools the area at the same time. the only thing i wish is it was a little bit quieter. unless this is in a closet or behind closed doors the sound might bug you. but it doesn't claim to be silent so i’m still giving it 5 stars. I have bought another one since and love them both

Pretty good fan. Not very loud. I bought it to use for an ice box and it works perfectly for that. Good air flow. Don’t have to turn the speed up very high to keep the box cool. Haven’t had any issues with any of the shoes I’ve put in there yet. Would definitely recommend this fan for that purpose.

I've bought three of these over time and installed them in the same service. I have it installed outdoors in a do-it-yourself radon abatement system. They're cheap, and initially they're very quiet, but after a year or so of continuous running they start to make noise which becomes more and more objectionable. It's kind of obvious the bearings just aren't up to the job. Fine for short-term use, but I've finally learned my lesson.

Arrived on time, and worked as expected.

Had this fan for a month or so and enjoy the performance. Moves a good amount of air without being too loud. Works great in my 4x2.