Large duct penetration

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This can interfere with the process of inspection. Deflection will not be as great on a shorter span. This can cause gaps or voids to develop within a firestop system, allowing fire and smoke to pass through unchecked. Firestopping non-dampered heating, ventilation, and air-conditioning HVAC duct penetrations in fire-rated walls is more involved than installing that ubiquitous red caulk into the space between the duct and the periphery of the opening. UL design, as a general rule the retaining angles should be sized so that they lap 2 inches onto the duct and 1 inch beyond the periphery of the opening. Insulated sidewalls to prevent condensation.

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Many additional designs are now available to cover various other permutations where steel ducts are insulated with light-density glass fiber duct wrap.

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Some duct designs for smaller square or rectangular ducts may list the retaining angles as being optional. Behavior of Sheet Metal Ducts Under Fire Conditions Although there are a variety of different materials used to fabricate HVAC ducts—such as insulated panels, fiberglass reinforced plastic FRPaluminum sheet stock, or different grades of steel—sheet metal ducts fabricated from steel sheet stock are the most popular type of HVAC duct used in commercial construction. On many projects, there are questions about how to properly firestop ducts containing dampers where they breach fire-rated walls. It does not stop there, however. UL design, as a general rule the retaining angles should be sized so that they lap 2 inches onto the duct and 1 inch beyond the periphery of the opening.

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