The drum in drum roasters is typically made of cast iron and is heated directly by a gas burner underneath, which also heats the air being pulled through the machine by a large exhaust fan.
factualpending
Evidence Quote
“You have underneath here a heat source, typically it's a gas burner... gonna heat the big metal drum typically made of cast iron, but primarily it's gonna heat air.”
Created: 8/13/2026, 9:53:30 AM
My Notes
Loading notes...