it`s a cyclone inside the container.and a fine steal net so no coal reach the vacuum cleaner filter.
I have bulid it like this one.It works really fine
(broken link removed to http://www.swd.se/pellets/sug03.jpg)
I have bulid it like this one.It works really fine
(broken link removed to http://www.swd.se/pellets/sug03.jpg)