Type: bug?
Priority: Low

regular furnace and brick furnace does not release soot, while electric furnace releases soot, steel furnace release lots of soot when powered by any means, arc furnace also releases ~10 soot when opening and none of them supports exhaust connection, why? how do i even power them safely.

what the heck is the soot? result of smelting items?

regular furnace and brick furnace does not release soot

I can't change the vanilla code for the regular furnace and any other hacky solution isn't really worth it, nor does the brick furnace need to emit pollution since it's only at best used in small numbers in earlygame.

how do i even power them safely.

To some extent, pollution is unavoidable. In the case of soot, that's not that big of a deal since most of the effects are purely cosmetic anyway.