I asume that flyash is what is created when the stove is shookdown. Happened to have door open when I did it this this am and noticed an incredible amount of dust heading out the flue.
I assume this is going to deposit itself at the point where my stove pipe makes its transition from horizontal to vertical where two 90' elbows are joined at 90'.(form offset)
I think most of the dust that my woodburning made ended up here to the point to which it almost closed off the chimney last spring.
How often should expect to have clean the pipe out? With a hot fire dailey to "cleanout burn" the chimney with wood it wasnt much of a problem maybe twice a heating season. How about with ash from the coal?