Wondering if there are differences in temps of inserts vs free standing stoves. My usual cruising temp with insert with blower on is 500 to 600 degrees. If I ever turn fan off, I notice the temp go up a good amount. At these times, the fire inside appears to not be raging in any way. But yet I may see temps in 700 to 800 range if blower is off, as measured in slot between top of insert and metal surround. Does this seem normal?