When cutting the tops from the root how close do you make the cut to the rings.
When drying the roots I will be using a 10' by 10' spare bed room will be able to regulate the temperature and have fans to circulate the air can you also use a dehumidifier or will this cause them to dry to quickly.
I usually leave about 1/4 inch of the stem on the root above the last growth ring. I have dried roots before in a spare room of the house, with all windows open to keep the breeze circulating. Keep them out of direct sunlight. I put mine on a frame with window screen, so they are lifted off the ground and can get air underneath them. After about 5-10 days, I usually go flip them over, being very careful not to break off any root hairs. (I don't know why it matters, when I give the roots to the dealer, he grabs them in handfuls and all the root hairs break off anyways).
You are on the right track. Lots of air movement is the key. I don't know if I would leave the windows open though, as this could introduce cooler, moist air. Just keeping them at room temperature (or a little warmer even) and lots of fan action is all you need.