The requirements in this Standard cover dampers intended for use in heating, ventilating and air conditioning (HVAC) systems. Leakage-rated dampers (smoke dampers) are intended to restrict the spread of smoke in HVAC systems that are designed to control the movement of smoke within a building when the HVAC system is operational in engineered smoke control systems. Combination Fire and Smoke Dampers are intended to restrict the spread of smoke in HVAC systems that are designed to control the movement of smoke within a building when the HVAC system is operational in engineered smoke control systems, and provide a barrier to passage of flame and hot gases. Combination Fire and Smoke Dampers shall meet the requirements of CAN/ULC-S112, Standard Method of Fire Test of Fire-Damper Assemblies and this Standard.