Insulation Vent

[bamforp]

I am still getting my thoughts together for a 21" homebrew dome build (thanks to all that have commented on my previous thread) and have another question I am hoping the forum can help with. I have read that it is advisable to vent the ceramic insulation blanket layer to allow moisture/steam to escape which makes sense. Most of the vent solutions have the vent passing through the render/stucco layer to the outside with some sort of cap arrangement to keep the weather out. Is there any reason why the vent cannot exhaust into the flue gallery instead? I was planning to drill a few 5mm holes through the back of the gallery so that they exited into the insulation layer between the inner dome and the outer render layer. That way the insulation layer is vented and the flue gallery provides some weather protection.