Can I put in meat and dairy utensils (such as pans) in the oven at the same time? As long as both foods are pareve, do I have to cover the food and pan?
Technically you would be allowed to, but I would not advise it. Technically the steam that comes out of both pans, even if hey would mix would be nat bar nat bar nat, and not an issue, however if the two pans touch, especially if there is moisture or one pan overflows onto the other, then it will be an issue, there is is not advisable thing to do.
Hilchos Basar B’chalav 8-20 ftnt. 64, Poskim