BN-LINK Variable Fan Speed Controller, Plug-in Electric 3 Speed Regulator Adjuster Cordless for Duct Inline Exhaust Vent Blower, Ventilation Fans, AC Motor Speed Controller, 125V, 4.8A, 600W

I’m using this to manage the temperature range on a livestock heat mat for my sulcata tortoise. It is doing a good job.

Great speed control. Worse as intended. Highly recommended.

We use these to control speed of window fans in bathrooms to better control speeds. We use fans to vent air and allow heat from fireplace to migrate toward other end of house by exhausting air out bathroom window; sometimes when windy we have to increase outflow. Great easy to use product.

Kinda works

I will buy it again!!

Affordable control for your ventilation fan.

WORKS - but be aware this changes the current to square wave WITH HUM ! It works, but I had hoped it was adequately designed to NOT induce the huge HUMMING noise these kinds of controls almost all seem to do, minus the really high buck ones. The modified square wave electrical signal that comes OUT of this control that allows your fan to run with less RPM - makes ANY fan HUM!! In many aps, that's not a problem, so this is your unit!! Who cares about a little hum in a body shop, welders area, barn, etc? BE AWARE --- you run ANY fan or motor below a certain RPM and you WILL BURN IT UP!!! Nothing good happens from that! Turn your fan ALL THE WAY up to HIGH, .......... THEN use your new control to reduce speed. That's how ya do it, but they don't tell you so. Trust me, and the other experts who know this is what works. Not ideal to set your fan to the LOW of 3 settings - THEN use your control to lower it more. You can try that, but make sure nothing is getting hot - wires, controls, plugs!!! It "may" harm your fan motor if you go too low, too long~!

This is what i needed to control fan speed on my attic fan THANK YOU