Burnout Furnace Ventilation Suggestions

For the Castable and for the Ceramic there is a burnout process. The castable made a lot of smoke and we were unable to use it and I am unsure about the Ceramic it just says well ventilated but shows a closed box furnace and kiln in the images. We have high temperature box furnace with no openings for ventilation. I am looking for suggestions on what kind of furnace you need for burnout for each of these resins that allows for enough ventilation - would the fully enclosed furnace I have with an exhaust system like this one http://www.ventafume.com/table-mounted-ventilation-systems/ hooked into my current duct work be sufficient?

best option is down draft ventilation system on the kiln. best way to evacuate the cavity. cleaner casting.

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