the choice is yours. if you think that you need too then put the gasket in and see what happens. if you dont like the window getting snowed over then remove it. in any case do tell what you find. im planning a mark I for the geerage next year.
Looking to resurrect the old thread here. I just put mangafire elite in and i am having trouble controlling the fire stove is air tight except these slits. My knob is clised and it wont kill the fire just keeps on roarin.