How much heavier gauge is used on sleeves of a fire damper compared to the duct?

When it comes to fire dampers, the use of a heavier gauge material for the sleeves compared to the duct is crucial for maintaining the integrity and fire-resistance of the ductwork system. Fire dampers are specifically designed to prevent the spread of fire through duct systems; therefore, the material construction of these components must meet higher standards to withstand extreme temperatures.

Using one gauge higher than the gauge of the duct for the fire damper sleeve captures the need for added strength and durability while still ensuring that the components can be effectively integrated into the existing ducting system. This additional thickness provides enhanced protection against fire and helps to maintain the performance of the fire damper under operational and emergency conditions.

In contrast, options that suggest no change in gauge or lighter gauges would compromise the effectiveness and safety of the fire damper, making it less able to withstand high heat or pressure. Choosing gauges that are excessively heavy, such as two or three gauges heavier, could lead to unnecessary weight and handling difficulties, making installation more cumbersome without providing proportionate benefits. Therefore, utilizing one gauge higher strikes a balance between strength and practicality for fire dampers.