A crack can occur due to the stresses placed on it from the expansion and contraction from repeated heating and cooling. The two main functions of a Primo firebox are to hold the lump charcoal and to protect the ceramic grill base from exposure to the high heat of the lit charcoal (1,500Â°F+/815Â°C). It can be alarming to see a crack. A crack actually serves as a ârelief pointâ for future expansion and it may not crack further.
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