How to make a smoker made entirely from old metal items. Like an old otherwise unused steel barrel with lid and old not working stainless steel metal fridge box with metal door on original hinges. Mostly metal fabrication work, light steel engineering. This smoker system can be used for all the smoking techniques, e.g. cold smoke applied for a long time, sometimes even for weeks of cold smoking. And of course fast smoking with higher temperature applied.
Brick oven with fireplace both having water pipes heat exchanger installed around its dense dome, the part which gets the hotter, for heating water and cooking food. Around the copper water pipes the thermal insulation goes to cover the system to make everything perform more efficiently.