Offset Smoker Fire Door SpacerControl Heat and Weather with the Fire Door Spacer The fire door spacer is a simple but effective tool for managing temperature and airflow in your smoker. If youve overshot your target temperature, this spacer lets you prop the firebox door open slightly to release excess heat and bring your cooking chamber back under control. It's also ideal when you're cooking with an open firebox setup and encounter heavy rain the spacer allows you to prop the top