A more durable honeycomb. Can't crack or crumble, even at highest operating temperatures. Less build-up of wood ash, within the honeycomb cells. Sharp steel edges actually "cut" ash as it goes up the flue. Better air flow, less cleaning maintenance. Lower "light-off" temperature. Engage your draft bypass at 100 degrees lower temperature than with ceramic honeycomb. Steel heats up faster than ceramic. Recovers more usable heat from wood smoke. A worthwhile extra expenditure for better performance. Made in USA
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