Six. Just after cleaning the flue, dependant upon the system We'll clear, the smoke chamber and smoke shelf in fireplaces and that is a critical stage. We also thoroughly clean the stove pipe and wall thimbles in appliance configurations. General, understanding the well being of your HVAC system helps professionals https://www.google.com/maps/d/edit?mid=1jjXSq8gw8QSE7BOu9Py2t25mQ1oCHYU&usp=sharing