minerdream/md_technic/config.lua

md_technic.smelter_refractory_duration =  tonumber(minetest.settings:get("md_technic.smelter_refractory_duration")) or 5000
md_technic.smelter_min_burntime=  tonumber(minetest.settings:get("md_technic.smelter_min_burntime")) or 30
md_technic.smelter_speedup =  tonumber(minetest.settings:get("md_technic.smelter_speedup")) or 1.5