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Also because hot air rises having vents at the top results in the hot air pushing it's way out and more passively letting some fresh cool air in. The cold and hot air run into each other and slow down. If we have openings near the bottom or middle air will be drawn in as the hot air rises away...

If they are getting other things it would still be good but not really necessary to add grit. Grit is a much sturdier rock than most sand particles. Sand will get rubbed down quickly requiring lots of it compared to granite grit. If you don't have something like seramas 0F is a good night...