12 volt fan

If you boondock and need to use a fan pay attention to the specs, specifically the amp draw.

1 amp an hour would gobble up 8ah in an 8 hr sleep time.

There are some fairly quiet computer processor fans and usb fans.

I have a small 2x2" processor fan in my fridge. I can hear it when we go to bed and things are quiet.

Jim

Interesting. I bought two of these to control my LED reading lights.

Maybe I should have bought three and used one for the fan. :S

(the link above looks screwy but it works)

I tried reversing the O2 Kool. The shape of the blades allow it to cavitate and it didn't push the air well.

Endless Breeze may work better in reverse.

I used a PWM exactly like what Geewizard pointed out except the pot was attached to about 5" of wires.

Drilled a hole for the pot on the inside curve of the base and attached wires from the original speed switch to the PWM. That allows you to use a 12V power transformer with the original power connector or use a direct connect 12V cable.

By putting the PWM in the O2 Kool base, you won't be able to power it with D cells.

Geewizard wrote:

Joe417 wrote:
The Endless Breeze and O2 Kool were both too noisy for us. I went with the O2 Kool.

Its cheap but noisy at rated voltages.

I found that is was quiet a 1/2 voltage so I added a $3 pulse width modulator which allows it to be quiet while moving less air but also to move a lot of air if needed.

You can do the same with the Endless Breeze, it just costs more.

Like this?

That should do it...

I have one of the reversing kind like this for my Vortex vent fan, never got around to installing it, might hack it into the Endless instead

Joe417 wrote:
The Endless Breeze and O2 Kool were both too noisy for us. I went with the O2 Kool.

Its cheap but noisy at rated voltages.

I found that is was quiet a 1/2 voltage so I added a $3 pulse width modulator which allows it to be quiet while moving less air but also to move a lot of air if needed.

You can do the same with the Endless Breeze, it just costs more.

Like this?

The Endless Breeze and O2 Kool were both too noisy for us. I went with the O2 Kool.

Its cheap but noisy at rated voltages.

I found that is was quiet a 1/2 voltage so I added a $3 pulse width modulator which allows it to be quiet while moving less air but also to move a lot of air if needed.

You can do the same with the Endless Breeze, it just costs more.

In case anyone is interested, here's a link to the USB fans that I've been using which are relatively quiet and cheap USB fans.

Take a look here.

You could use a USB powered fan and run it off a 12v adapter or 110v adapter.

I also use the O2 kool fan. Works very well and didn't cost an arm and a leg IIRC. I've had it so long I don't remember what I paid for it or where I got it.