Yes, this boiler is positive pressure. There are passageways between the combustion chamber and heat exchanger that may need to be cleaned. I've only cleaned them out once on a boiler that had clogged with soot. My Biasi is about nine years old and I have never needed to do this. I clean the combustion chamber every time I clean the boiler though
If the women don't find you handsome, they should at least find you handy!