94pt 'cool o matic' gally exhaust fan

[sfedeli3]

Hi Greg,

A wall-mounted rheostat would look nice, but you could easily conceal
a simple GM headlight switch up in the fan assembly, but below the
blades. This would allow you to manually override the wall thermostat
and also regulate speed with the "dimmer" circuit on the switch. Most
of those old switches are available at auto parts stores for around
$8. If they can handle headlight voltage, a fan should be no sweat.

Shane Fedeli
85PT40
Hershey, PA

--- In WanderlodgeForum@yahoogroups.com, "Gregory OConnor"
wrote:
>
> My center exhaust fan is a 12 volt roof mount exhaust. I keep it
> running on a wall mounted thermostat(as designed) set at 90degF
> with a window open and a cheap home style heater duct filter in the
> window. works good, the filter gets choked with dust that would
> otherwise settle in the parked bus or fan blades and motor(should
> have a window open at each end but am too lazy).
>
> I took the fan housing apart to clean and lube a noisy bearing and
> uncovered a stowed three speed switch under the fan. the switch says
> potentiometer and has two springs at back which I believe are heat
> sinks (they get hot). I would like to have access to the switch to
> reduce the speed while drycamping (layoff Leroy) and conserve
> battery. I also like the idea of a slower moving fan while stored
> and unattended and a higher speed fan while cooking.
>
> I was thinking of hard wireing around the switch and moving the
> potentiometer/switch to the wall near the thermostat . if you have
> the switch where the fan mfg designed (thru a hole in the cover) you
> cant slid in the headliner blank. Prob with moving the switch is
> the "heat sink" in the wall???? I dont even know if the thermostat
> has a wire 'to the fan' or 'to a relay - to the fan'??? also of
> concern is the need for a heat sink?? does a product that produce
> heat (pot switch),not consume energy?? would a rheostat be a better
> choice for the wall??? gotta learn more about potentiometer vs
> rheostat, both cool words but must be more to their differences.
>
> Greg94ptCa
>