Hon&Guan 4 Inch Inline Booster Duct Fan with Speed Controller - 130 CFM Airflow with 6W Ultra-Low Power and Low Noise

I tried another auxiliary single-speed duct add-on brand from Menard's that did not provide a respectable increase in flow. Unlike the other model, this variable-speed blower fan is more powerful, allowing me to set it at 50% with better airflow. The unit is a bit smaller in outer diameter (OD) than the inner diameter (ID) of my new 6-inch duct section, so I sealed the gap with a thick, metallic duct tape.All of these duct blowers add noise to the home, same as a window AC unit would. Expect to hear it. The duct fan sound does travel through the ductwork. I operate it only when it is needed to cool the room. I use a wi-fi power plug (and phone App) to power the blower on/off --- so I don't have to travel to the basement to deactivate it.

This little fan will move some air.I needed an exhaust fan for welding inside my garage, and this fan is doing what i need it to do.

Had it for a few weeks now seems to be pretty strong and quiet

This fan is awesome. I use it for my stool s1 20w laser and combined with the air assist I have, I don’t get char marks on my engravings.

Perfect fit and keeps my basement air fresh. I use a timer to control hours of operation.

this pushs out air like 35 40w would do this rpm number ia the reason why cfm totally went obsolete

Loud when blowing, first one blew up in the first 6 months disappointed, had to purchase a new one couldn’t get them to replace it under a buyers warranty or anything. If this happens again I’ll update you all

This fan works very well. It was easy to install and definitely clears my laser of fumes.I only gave 4 stars as the 1st fan I received was a "Kit" internally when received.Then the 2nd one (replacement) I received was in a plastic bag with no paperwork / box.