Slow down exshaust fan

C

Chbronco

Member
I want to slow down my 6"exhaust. Ran a cheap house dimmer switch between the fan and the Amazon variable control box which blow the box fuse how do I hook it up properly?
 
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thumper60

thumper60

Well-Known Member
Chbronco said:
I wanted to run the fan slower than what it would with the controller, thought would work.
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So you have a speed controller on it already but you want to slow down the fan more? My 15 dollar controller i got at the hydro shop goes from zero to full blast been running my inlines for yrs with them.
 
thumper60

thumper60

Well-Known Member
DCcan said:
I got 3-4 in a box, they usually come with a fan. Just makes too much noise for me indoors.
They clip the voltage, gives the motor a hum that gets louder as it goes slower.
It's like kicking the motor 60 times a second vs spinning it slower. They also work for hotplates, drill presses.
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I hear ya i dont grow in my house so a little noise doesnt bother me here.
 
solakani

solakani

Well-Known Member
Variac transformer. Now I need one. The fans on my network switch screams louder than jet engines but I was able to slow them down with resistors
 
coreywebster

coreywebster

Well-Known Member
futurebanjo said:
Slightly different thought on this...

You can get mechanical plug timers with 15min intervals/over 24hr, so you could just flick off every second pin for 15mins on/15mins off?

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But then you would have an unstable temp and humidity and only negative pressure half the time , meaning leaking smelly grow room the other half.
 
Star Dog

Star Dog

Well-Known Member
A variac and a quality relay effectively give you a hybrid fan controller that cost £200/250+ for a basic model without speed control.

A variac and a dual/twin relay will cost you around £70 and it's a straightforward wiring job if you're diy savvy.
 
DCcan

DCcan

Well-Known Member
Thats what those triac speed controllers do to the sine wave, which is what it's doing to the motor and creating all those loud harmonics.\
They don't work bad for small reductions in speed, but really suck at low speeds.

A variac just reduces the amplitude, keeps a nice clean sqiggly line to the motor.
 
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