The support systems for horizontal grease duct work systems that are 24 inches and larger must be designed to support the weight of the ductwork plus what additional weight?

The support systems for horizontal grease duct work systems that are 24 inches and larger must be designed to support the weight of the ductwork plus an additional weight of 800 pounds. This requirement is outlined in the NFPA 96 standard, which emphasizes that grease ducts can accumulate substantial amounts of grease over time, significantly increasing their overall weight. In order to ensure safety and structural integrity, duct support systems must accommodate not only the duct's inherent weight but also an appropriate safety margin to account for the additional load from grease and other factors.

This additional support is critical because ductwork must remain securely in place, particularly in commercial cooking environments where heat and grease can pose fire hazards. Properly designed support systems help prevent potential failures that could lead to hazardous situations, including the risk of grease fires. By adhering to the guidelines set in the NFPA 96 standard, facilities can minimize such risks, ensuring a safer working environment.