Roaster ducting

Hi,

I am currently roasting on a toper, but am switching to diedricht. Currently, My stack is a triple wall air insulated rated for 2100 degrees. I keep it clean & have never had an issue. Diedricht recommends using a positive pressure stack. Obviously, it would be nice to just vent the new roaster(IR-12) through the existing stack. Can't find any defintive information on the subject. Any help would  greatly appreciated!  

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