Quality of Steel
Stainless steel is a better choice than mild steel. Your outdoor furnace will be exposed to several damaging elements such as rain and snow which help develop one of the main enemies of an outdoor furnace ? rusting. There are different grades of steel and several are subject to rusting and corrosion. Since quality stainless steel is quite expensive, some manufacturers use cheap, low-class stainless steel that will eventually rust and corrode.
One of the major causes of corrosion is the ash. It is better to shop for a furnace that produces lesser amounts of ash. Also, it helps to regularly empty out the ash and to cover the stove pipe during the off season.
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