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Mar 2, 2008 - Was very interested to learn in the previous 'Eberspacher D2' thread that ... I thought of further insulating the exhaust with some of the insulation that .... 15 mm thick.. then there is an (apx) 50 mm outer stainless steel flexi hose. Insulating a heater exhaust? 21 Mar 2018
I wrapped mine with the exhaust insulation fabric tape available at any auto parts store. 1 roll was enough to double wrap and it is only warm to the touch.
Rockwool 810. Cheap and there is no better isolation. Don, 't close it the first time if you heat it up, so dissipear the smell better. Later no smell and really great!