Variable Fan Speed Control for Inline and Duct Fan Adjustable Speed Controller

Great value. Does the job. I use this to limit the noise of a high-velocity air circulator fan that I keep in my outdoor seating area. Contrary to the description, what this product truly is, however, is a woodworking router speed controller. That's a plus or a fan application, given that it is marked as having a 15-amp capacity. It takes a pretty big fan to get up to 15 amps. The three-position switch was a bonus (ON-OFF-VARIABLE).

Works great for my 6" inline duct fan!! I use a ipower 6" duct fan in my grow tent and it was super white noise loud!! This control slowed it way down and still offered significant airflow!! EXTREMELY HAPPY ABOUT THIS CONTROL.. I read lots of reviews that said it doesn't work but it does... Flip the switch to VAR.. and it works great!! Cuts the noise in half!!!

Must have appliance for strong or loud fan motors! Turn down the speed until it suits your needs. For small wattage fans, have to go to 3/4 full and find the hairline range for your taste, but its there and stays there at the desired speed as long as you don't change the setting by bumping it. Just reset it again. Haven't used it on more powerful fans, but suspect it has a larger range the higher the wattage. Solution to my strong and loud 7" fan is solved!

This is a variable speed controller. It doesn’t control temperature like a thermostat would. I bought it because I wanted to be able to control the speed of an electric motor, it works OK but instead of really giving a wide range of speed control it basically goes from off at the lowest setting, to turning on at about 80%, two full speed at 100% of the dial. I was hoping to be able to slow the motor down a lot more but it doesn’t do that on the electric motor I’m using. It may work on other motors better though. It’s very well-made and very simple to use and operate. The switch also allows you to turn your device on and off at 100% power which is nice when you don’t need to control the speed.

I purchased this unit to control the temperature of a round bottom flask in a heating mantle, after reading the product description that states it is "widely used for controlling heating elements." Heating mantles often have built-in controllers, but when they don't a controller can run into the hundreds of dollars to perform the same function (triac AC power control, same as a wall dimmer switch). It is not clear from the Low-Medium-High markings in the variable mode that it is continuously variable. As the unit was received it only adjusted down to about half power instead of fully off (easily seen when powering an incandescent lamp). Being an electrical engineer, I planned to modify the circuit to do that, but I didn't need to because it already includes a tiny trimmer potentiometer on the back side of the circuit board (only seen as a hole that receives a plastic trimmer for adjusting). Of course this violates the standard warning that only a certified technician is qualified to work on it. I think it would be beneficial to offer a different version of this same controller that isn't intended for fans but only heaters and lamps that adjusts all the way down to full off.

Great product. Heavy duty. What I like about it is it has an off position. This is for my fireplace fan. Plugged right in work absolutely perfect.I'm a real customerMark

This did not work with my inline blower. both of these items made in China. It would only work at a certain setting in the dial, and when varying any little bit from that spot, the motor would just stop turning, hum, and so it did NOT have a variable speed. This was not as advertised.

got very hot and smelled equally hot, stopped using for safety sake