How many do I need?
One firebrick for each SmartBurn.
Benefits of a firebrick
The SmartBurn ingredients are solid at room temperature then change to a liquid when heated. Raising the SmartBurn tube off the firebox floor will help ensure the tube is kept flat, level and undisturbed during heating which will ensure the ingredient mix remains contained within the vessel. Importantly this keeps the ends of the tube free from being burried in ash allowing the ingredients to breathe and release from the tube.