This is my first season with an insert having only had fireplace in the past. Did my proper "seasoning" of the insert and had my first couple of good fires. The other night i knocked what i believe to be the secondary air tube loose from the top of the insert. I was able to put it back in but can't confirm which direction the air holes should be facing. I've noticed an increase in soot on my glass even with good fire temps. If anyone can help that would be great. Thanks Andrew