SilverCrate+™ 18.5 Inch Smokeless Fire Pit w/ Waterproof CoverINTRODUCING The SilverCrate+ 18. 5 Inch Smokeless Fire Pit w Waterproof Cover Unique Double wall Design: This smokeless stove features a unique double wall construction that increases airflow and makes the wood burn more efficiently. Ventilation holes at the bottom allow oxygen to enter the stove and channel oxygen up between the walls of the stove, bring warm oxygen to the top vents for secondary combustion. In addition, the unique double wall design