14SH200001022 STEEL DUCT - FIRE RATED CLADDING INSTALLATION MANUAL DUCTLINER GS - VENTILATION, SMOKE OUTLET AND KITCHEN EXTRACT DUCT SYSTEMS Tested under BS 476: Part 24: 1987 Fire tests building materials and structures - Method for determination of the fire resistance of ventilation ducts V2 15-01-15 E
Contents 1. Required Materials... 1 2. Tools Required... 2 3. Ductliner GS characteristics... 3 4. Installation Procedure Horizontal & vertical GS ducts U channel... 5
Required Materials Before commencing the installation ensure that the following materials are available in order to complete the installation correctly. A B C D E F G A. Carbon Steel Threaded rods B. L- angle support C. Self drilling screws D. PassiveTec 15 mm board E. Mineral wool 100 kg/m3 density F. Metal anchor G. Top hat (omega) profile H. U channel profile 1
Tools Required Circular Saw Cut Jig Screw driver Hammer Drill Rubber or Wooden Mallet Tape Ruler Permanent Marker Putty Knife Paddle Mixer Level 2
Introduction SCOPE PERFORMANCE CRITERIA BS 476 part 24 specify methods of test criteria for the determination of the fire resistance of ducts under standardized fire conditions. The general purpose of these tests is to measure the ability of a representative duct or duct assembly to resist the spread of fire from one fire compartment to another without the aid of fire dumpers. The test specifies the required performance criteria under prescribed conditions for periods of exposure to fire, taking into account joints, penetration through wall/floor, air supply and exhaust openings, as well as suspensions devices. TYPES A&B FIRE EXPOSURE Stability Stability failure shall be deemed to have occurred in duct A within the furnace and in ducts A and B outside the furnace when the duct collapses in such a manner that the duct can no longer fulfils its intended function. Insulation Insulation failure shall be deemed to have occurred when the temperature rise above initial ambient temperature in the laboratory on the unexposed surface of the test specimen outside the furnace exceeds either. a) 140 ºC as an average value. b) 80 ºC as a maximum value read by any surface thermocouple. The test is divided into two different potential hazards: - Fire from outside the duct - Fire from inside the duct TYPE A Fire Outside the duct The duct is subjected to a pressure of 300 Pa. One end of the duct is constructed outside the furnace and is unrestrained allowing for the potential of deflection of the duct. During the test, the values are measured for the leakage due to pressure, the deflection of the duct, and the temperature. Integrity The presence and formation in the test specimen of cracks, holes or other openings outside the furnace through which flames or hot gases can pass shall constitute integrity failure Integrity failure shall also be deemed to have occurred when the cotton pad is ignited or when sustained flaming, of duration at least 10 s, appears on the unexposed face of the test specimen outside the furnace. TYPE B Fire Inside the duct Inside the furnace the duct is constructed partially opened. A fan is connected to the duct in order to extract hot furnace gas at a velocity of 3 m/s. The duct is secured at both ends. Forces from the duct expansion along its length and the temperature increase on the unexposed side are both measured during the test. 3
DUCTWORK Mechanical ventilation systems Mechanical ventilation systems are used to extract stale or polluted air from a building and to supply replacement fresh or conditioned air. The fans and air-conditioning equipment required are generally located in separate plant rooms, often in a basement or on the roof. The distribution of the fire air involves ductwork extend throughout the building, penetrate compartment walls/floors and have openings in every space through which it passes. Smoke extraction systems Smoke extraction is the forced removal from a building of products of combustion, such as smoke and toxic gases, which could otherwise reduce visibility and impair human functions. In view of the importance of maintaining the designed extraction rates during a fire, Part 24 also imposes an additional requirement for smoke outlet ductwork (i.e. the retention of at least 75 % of its original cross sectional area during the test). Kitchen extract systems Kitchen extraction ductwork presents a particular hazard, in that combustible deposits such as grease are likely to accumulate on its internal surfaces, and may spread fire if ignited. A fire in a kitchen may spread to other areas of the building by way of the kitchen extract ductwork and may also prejudice escape routes. Car Park extracts systems Car parks are required to have separate and independent extraction systems, because of the polluted nature of the extracted air. It is recommended that fire dampers should not be installed in extraction ductwork serving car parks. Any duct or ductwork penetrating fire resisting barriers must be fire resisting. Dual ventilation / Smoke extraction systems These systems serve as conventional systems under normal conditions, but are converted to a smoke extraction system in the event of fire, thus providing an economical dual system. Pressurization systems Pressurization is a method of restricting the penetration of smoke into certain critical areas of a building, by maintaining the air within the critical areas at pressures higher than those in adjacent areas. It applies particularly to protected stairways, lobbies and corridors, as smoke within these areas would inhibit escape and also to fire fighting shafts serving deep basements, because of the difficulties in clearing smoke from basements. Fire dampers cannot be used. 3
Installation procedure Horizontal GS Ducts 2 houres fire rate (Integrity & insulation) A. Horizontal & vertical GS ducts U channel Up to 1250 mm width and 2500 mm height 1. Construct and place U channel frame collars around the GS duct 2. Place the Mineral wool between the U channel frame collar sections 4
Installation procedure Horizontal GS Ducts 2 houres fire rate (Integrity & insulation) 3. Place and screw the board to the U channel frame collars 4. Place the PassiveTec board around the joints and build the penetration seal Place the PassiveTec cover strip on the wall/slab 6
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