What temp is considered and over fire

Your "redline" so to speak will depend on the type of stove that you have and the manufacturer's suggestion if any. What kind of stove are you running? Placing it in your signature line helps share the info.

I've yet to see the EPA give any advice at all on maximum temperatures as they aren't testing that aspect of the stove.

For a steel stove, I like to think of 750 as a good average max temp. A shot about that every now and again shouldn't hurt anything, but as a general rule I'd try to keep it less than that.

For a cast stove, I'd probably be more likely to want to keep it 700 or lower.

for a soapstone stove, it can vary from manufacturer. I've heard 600 for hearthstones and ~700 for woodstocks.

pen