UL 555S:2014 free download

UL 555S:2014 free download Smoke Dampers
2.1.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.
2.1.4 Specific components are incomplete in construction features or restricted in performancecapabilities.Such components are intended for use only under limited conditions，such as certaintemperatures not exceeding specified limits,and shall be used only under those specific conditions.
2.2 Units of measurement
2.2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.
2.3 Undated references
2.3.1 Any undated reference to a code or standard appearing in the requirements of this standard shallbe interpreted as referring to the latest edition of that code or standard.
3 Glossary
3.1 For the purpose of this standard the following definitions apply.
3.2 CONTROLLED CLOSURE – The closure of a damper by means of electric, pneumatic, hydraulic,or other similar device that inhibits the rate of closure.
3.3 DYNAMIC CLOSURE – The closure of a fire damper under conditions of airflow and heat uponactivation of the heat responsive device.
3.4 HEATED AIR OPERATION – The operation of a smoke damper by means of the actuator whenthe damper is subjected to a condition of airflow and heat.
3.5 MULTIPLE SECTION DAMPER ASSEMBLY -Two or more dampers assembled together tofunction as a single smoke damper, or corridor damper or combination fire and smoke damper.
3.6 NON-CONTROLLED CLOSURE – The closure of a damper by means of spring operation, gravityor other similar device that does not inhibit the rate of closure.Non-controlled closure is also referred toas instantaneous closure,rapid closure or slam shut closure.
3.7 SAME DESIGN FAMILY – Actuators composed of the same gear train and motor but incorporatesa transformer,among other features, for different input voltages and has nominally the same forceltorque output.
3.7 effective January 25,2015
3.8 SMOKE CONTROL SYSTEM – An engineered system that uses mechanical fans to produceairflows and pressure differences across smoke barriers to limit (see Table 16.1,Leakage
classifications) and direct smoke movement.
3.9 VOLUME CONTROL DAMPER – A fire damper employing position devices that enable the firedamper to remain in positions other than fully open or fully closed.
4 General
4.1 All electrical components, damper actuators, fusible links, and heat responsive devices shall be examined and tested, as required, for their intended function.
4.2 A heat responsive device provided with a corridor damper and combination fire and smoke damper shall have a temperature rating which is equal to or less than the temperature rating of the damper.
5 Protection Against Corrosion
5.1 A ferrous metal part used in the damper assembly shall be one of the 300 Series of stainless steel or shall have one of the following corrosion-protection systems: