Wood ash. Partical size.

[leigh47]

What would be the average partical size of well burnt wood ash? I refere to the ash "dust" not possable larger pieces of incomplete combustian.

[heathfield]

Hope Page 23 will help...

http://www.hinkleycen...d_ash_phaseI_98-6.pdf

[leigh47]

Thank you for your answer heathfield. The link you suggested is very interesting although I have not yet had time to read it all. Page 23 is similar to what I wanted but those tests were for different reasons.
The reason I have in mind is (May be a silly question, like how long is a piece of string?) I want to have a dust extraction system to pick up the "dust" into a container.
The problem is if the filter medium is too coarse it lets through the dust. A finer medium rapidly clogs up and further suction is lost, with very little deposited in the container. Hence the question about partical size. But I suppose the size can go down infinitly small and therefore some will allways pass through the filter.
I need to have some size in mind in order to compare with the filter medium coupled with the fact that the finer the filter the quicker it be block.