What type of steel gauge is required for underground grease ducts?

For underground grease ducts, the mechanical code specifies certain thicknesses of steel to ensure safety and durability in containing grease-laden vapors and preventing any potential fire hazards. The correct answer indicates that No. 16 and No. 18 gauge steel are specified for this application.

No. 16 gauge provides a balance between strength and weight, which is crucial for supporting the ductwork underground. It is thick enough to withstand the conditions present in grease ducts, such as pressure and potential impacts, while still being manageable for installation. No. 18 gauge, while slightly thinner, is still robust enough to function properly within the duct system when paired with No. 16 gauge. The combination meets the necessary structural and safety requirements as outlined in the mechanical code.

Choosing a properly gauged steel for these ducts is essential to mitigate risks associated with grease accumulation and potential fire hazards, ensuring that the installation complies with local codes and maintains the safety standards required for such systems.