ANY dust is too much

If an electric heater puts out zero, why use something that makes more?

Long term reliability (I know many here swap out gear faster than it wears out, but maybe SOMEBODY looks at longevity in mixers, amps, pre's, whatever you have down there ) is directly linkable to dust, ash and smoke (especially tobacco).

For me, there is nothing worse than an intermittent pot or an unreliable switch. You waste valuable time tracking them down and fixing them...

Put it this way... what was the last pro studio you saw with a wood fire in it?