This is when the more is better logic can creep into design to failure. Checking correct means and methods during commissioning is essential. Longitudinally, the boards are joined with Tecsel adhesive. There are many real-world fire scenarios that are probably going to render the smoke control system inoperable if fire dampers are placed in the ductwork. ), must be fire resistant or adequately protected throughout its route with the same level of fire resistance than the traversed elements, and tested according to the applicable UNE-EN from application/x-indesign to application/pdf But, some of the basic myth-busters can be covered here. Transversally, duct sections are joined with perimeter joint covers formed by Tecbor boards of 30 mm thick and 250 mm wide. Los ajustes de cookies de esta web estn configurados para "permitir cookies" y as ofrecerte la mejor experiencia de navegacin posible. Careful inspection of product data will reveal an upset temperature at which the remote reset capability is over-ridden locally. Enter your details in the login form in the Personal Area. On the roof, the smoke extract ductwork is at atmosphere, and the flashover risk no longer exists. The single-compartment smoke extraction duct is identified for example as E300single, where the number 300 or 600, defines the anticipated temperature of the gases. To that end, a choice can be made between the following alternatives: Put an element which, in case of a fire, automatically blocks the cross section and guarantees in such point a fire resistance at least equal to that of the traversed element, for example, an automatic firewall dumper. It's worth discussing the concept of smoke extraction ventilation as defined in the Technical Conditions, which can refer to different types of fire ventilation systems: a) Smoke ventilation systems, built using exhaust ducts (so-called duct systems), which remove heat and smoke through grilles located on the ventilation ducts. Rock wook 50 mm thick and 145 Kg/m3. 1, where the penetration simply didnt cause wall or floor failure under a single, rather-specific fire scenario. Every duct system not wholly contained within a single compartment has some unprotected opening existing between compartments even stairwell and elevator shaft pressurization systems do this. Be specific when specifying this solution; however, because when left ambiguous, this solution can lead to unexpected failures. Myth: When in doubt, choose a combination fire/smoke damper. Dual smoke extract combined with; supply or /and extract systems can operate in two different modes to provide a solution for ventilation and smoke extraction. The tests for smoke extract ductwork multi-compartment is EN 1366-8. Contact your local rep. Is any other non-dedicated or dedicated smoke control ductwork at risk (NFPA 92 4.9 and 6.6.2)? Laboratory:APPLUS To counteract this, thermal expansion compensators are used. Remember, hot layer temperatures at typical ceiling heights (sprinkler controlled or not) will exceed the threshold temperature for most listed fire dampers or combination fire/smoke dampers. Do not use in a multi-compartment environment. The kind of air service can address the omission of smoke dampers, but it cannot address the omission of fire dampers. These issues are all easily avoided by eliminating wishful thinking and specifying the requirement clearly in the smoke control rational analysis report. Such components include access doors/inspection covers, attenuators, compensators, and ventilation grilles. NFPA 92 5.5.4), so cross section deformation, joint, or support failure of a duct are legitimate concerns; and. Sections of fire ventilation ducts are additionally used to collect and discharge other harmful and toxic extinguishing gases escaping fire areas, as well as in pressure booster systems used to control the air causing overpressure, which is discharged after exceeding the pressure limit. Editor's note: Click here to read Part 1 and Part 2 of this series. 6 x 80 mm metal anchors. The energy losses caused by aerodynamic resistance in the air ducts are also reduced. UNE EN applicable standards, as they appear in Annex DB SI G of the TBC are: Standard: UNE EN 1366-1 BS476 part 24 1987 The available fire damper temperature range is similar to that for fire sprinklers. Again, more is not better. How far into a zero-hour fire-rated duct (Duct A) must interior fire effects extend before risking failure? /0zu{\FJFQq# Dr}%a1KHha.SW8w6G|56U>^M$*3!"utuytx ?@!l* hg' ]mg(4xiPp2KIC)/e{BM7w4Lo l*0 9[F\cE>QG2^M]G@NpD b4/w R1"8^A~W'e|!9F{)E%$lsE= amB'`jL.ajn|>|HY6 (gKRbCf>_>45_K]m ]> |#6Gp ,V1UZPL%B;zU' 8WP9 C~. But, make no mistake, when directed to omit fire dampers as a mandate, some alternative protection must be provided. Lindab has acquired IP rights, customer contracts and supplier agreements for Thor Duct s fire ductwork system. Fire rated Fire rated duct enclosures including sprays, boards or wraps for mechanical ventilation systems. Shorting a proper analysis by defaulting to high-temperature fire dampers isnt the solution either. Where we construct a dedicated fire shaft, the ductwork in the shaft may be uninsulated. We dont get to cherry pick fire origin scenarios any more than default to minimum SMACNA criteria without a healthy serving of wishful thinking (NFPA 92 6.6). There may be requests to do so because of the proximity of services and roof mounted equipment. For multi-mode smoke control systems, running every possible sequence would take hours and significantly interfere with normal building operations. FSCS operators may actually need to exercise their ability to change an automatic sequence (NFPA 92 6.4.5). No. 8. Penetrations of fire partitions are qualified as components of a multi-zone ventilation system. FIGURE 5: A continuous upward airflow used as alternative protection. 1. The components used with fire ventilation ducts are also subject to the standard. Please click here to continue without javascript.. This is because ducts are designed to carry the hot gases from the scene of the fire out into the atmosphere. In all cases, you will find direction for achieving alternative protection whenever a fire damper is omitted. The main purpose of the single-zone smoke extraction system is to remove hot gases and smoke from the areas affected by the fire to facilitate fire suppression and evacuation of personnel from the area of fire hazard, while maintaining the criteria of fire integrity and/or smoke control specified for temperature exposure conditions at 600C. Ms informacin Aceptar. Can you put a fire damper inside the kitchen? Suspension rods, max. 2017-03-14T20:16:59+01:00 In the standards these systems of duct are specified as the multi-compartment smoke extraction duct and the single-compartment smoke extraction duct. Take the care to examine and eliminate any smoke dampers that are not essential to any active smoke control system. A fire damper contains a fusible link, which reacts when a temperature rise occurs. 2022 Fyreguard - Passive Fire Protection. Theres actually quite a bit to unpack here. Fire-rated ductwork is the most economical solution to omitting these fire dampers. Arrangement of such ventilation requires no ductwork layout, thus the involved mounting expenses are reducted by 45 %. Smoke exhaust ductwork, in Europe, is typically protected via passive fire protection means, subject to fire testing (typically to NBN EN 1366-8) and listing and approval use and compliance. Myth: I dont need fire-rated duct for smoke control ductwork when I omit dampers, because I heard there was a 20-year-old report on steel SMACNA duct that says so. This article will demonstrate when the most stringent criteria occurs and how to proceed accordingly. Figure 3 shows the effects of not using a thermal expansion compensator at appropriate distances for SMOKEsystem single-zone circular smoke ducts. BS EN 1366-9 is a duct suitable for smoke extract in single fire compartments. The weekly self-testing program is commonly missing at the commencement of commissioning, or, if its done, its quickly undone shortly after commissioning. By accepting cookies you can optimize your browsing experience. This reinforces the importance of the weekly self-test. They also can be independent systems or combined with a collective multi-zone ventilation system. NFPA 90A 5.3.4.3 and 5.3.4.4 correlate only to Duct B (ISO)/Conditions C & D (ASTM). 6. Elegantly done, in most cases, this should not interfere with normal HVAC operations, which is exactly why we need to take care to define exactly what we expect from the weekly self-test and stipulate the limits on allowable adverse impact to normal operations. Adobe PDF Library 10.0.1 No other services may be in the shaft. The test for EN 1366-9 is conducted without insulation and at 600 C. Consider a series of relocations or evacuations, accumulating the greater of 20 minutes or 1.5 times a timed egress (NFPA 92 4.5.1.2 and 4.5.4). They must not cause the smoke extraction system to fail while smoke is being removed from the building, and must be tested to demonstrate that they meet the same requirements as the duct they are part of. Will the resulting failure compromise an adjacent compartment? The designation of a select list of components isnt a get out of jail free situation. Such a deformation of the duct may decrease its diameter and/or cause it to break or lose tightness, resulting in the malfunctioning of the smoke extraction ducts. Visit our updated, Assessing the Risk of Fire Events and How To Best Mitigate Their Occurrences, Arenas Present Unique Life Safety Design Challenges, NFPA 99: Smoke Control Designed for Failure? Instead, each component is intended to activate in a safe sequence, and during that exercise, each component confirms it is individually still capable of functioning. The idea that minimum SMACNA ductwork fabrication, joining, and hanging methods can serve as even general smoke control infrastructure are baseless. In this case, a designer landed in the right place, but it was by accident, because this logic would just as well lead to applying Duct A/Conditions A & B when omitting fire dampers at supply air duct penetrations. The regulatory requirements demand the compartment of elements when traversed by installations, such as pipes or extraction and ventilation ducts. We make every effort to be accurate and true, and, as the passive fire protection industry experience and knowledge grows, we may update our guidance to reflect this. Alnor Systemy Wentylacji Sp. The duct is supported by an auxiliary structure made up of M16 threaded rods and 50 mm x 50 mm and 5 mm thick L-shaped upon which the duct rests. Usually, this situation is discovered later when returning for either tenant fit-outs, renovations, or semiannual/annual periodic testing. Dont start confusing the egress time with the minimum fire-resistance requirements. By visiting this website, certain cookies have already been set, which you may delete and block. The link causes the damper to close, thus maintaining the integrity of the structure it is installed in, to the prescribed time in minutes. %PDF-1.5 % The system is designed for each smoke compartment which is in a fire zone.

So, theres your litmus for alternative protection. One joint or support failure is all it takes to compromise the duct system. What's more, as one of the few manufacturers on the market, we offer thermal expansion compensators for smoke extraction systems in the male execution, made of our AMT flexible duct connector. The insulation protection is provided by the shaft construction. z o.o.ul. The fire properties of smoke extraction ducts supporting a single fire zone are defined in 270, item 2, points 1 and 2 of the Technical Conditions:2. Air service, supply versus exhaust, is irrelevant in this regard. Powsiska 64a02-903 Warszawa, Polska, PLN: 87 1050 1025 1000 0023 2865 9772EUR: 10 1050 1025 1000 0023 2865 9897SWIFT: INGBPLPW, Alnor Systemy Wentylacji Sp. Fire dampers listed to ANSI/UL 555, Standard for Safety Fire Dampers, have a maximum link temperature of 286F but are available as low as almost half that limit (Reference NFPA 90A, Section 5.4.5.2.2.1). The first article in this series states that just because there are no openings in certain compartments along the duct route, this does not relieve the full protection intended by fire inside and fire outside capability. Learn from our experts how to evaluate job opportunities, market your services, sell a Walk-through Survey, target areas for an Energy Audit, calculate energy savings, do retrofit work, and win continuing contracts for retrofit work. The weekly self-test requirement doesnt negate this need nor is it intended to. Thermal insulation has properties similar to fire insulation, but may not have been tested in an EN 1366-1 fire test. +48 22 737 40 00 fax. Contrary to conventional wisdom, even stair pressurization systems may be selectively programmed (NFPA 92 6.4.6.1.2), so they may not always be pressurized; Multi-mode smoke control systems dont have the capacity or sequencing to always pressurize every supply air duct (NFPA 92 6.4.4.1.2), so they wont necessarily follow fire spread across multiple zones automatically; Ductwork may pass through the zone of fire origin on its way to an adjacent compartment that needs to be pressurized (NFPA 92 6.6), so adjacent compartment fire scenarios are very real; Direct fire effects may be at or near enough to a duct opening before air is supplied (e.g. Duct consisting of Tecbor boards 30 mm thick. Copyright 2021. 2017-03-14T20:17:18+01:00 Sponsored Content is a special paid section where industry companies provide high quality, objective, non-commercial content around topics of interest to the ES audience. The exercise to evaluate and eliminate fire dampers that will interfere with any active smoke control system is important. The multi-compartment smoke extraction duct is identified for example as EImulti 30 or EImulti 60, where the number 30 or 60, defines the value of the fire resistance. NFPA 90A also applies. Contact him at jhauf@conquest-firespray.com. Stay up to date with the Fire Ductwork industry and compliance information. The fire damper functionality of the combination damper may still be a problem for all the aforementioned reasons. Lines distanced between each other 160 mm. Take advantages of registration: Products saving in a binding to the projects, Product consultation from our experts - Online, By using this form, you confirm that you have read the site terms of use. Once identified, this issue is fairly easy to avoid. xmp.did:B8105B68092068118083FACC525EF014 This process is best served from the outset by overt inclusion of self-testing performance expectations in the rational analysis. Manufacturing to the highest quality control standards. Evaluation service reports (ESR) from International Accreditation Service (IAS)-certified test labs or other approved agencies are readily available these days, and youll find they directly address this concept. Duty done? FIGURE 2: An example of a fire damper that is normally required in a rated wall. Reading the test specimen descriptions from the International Organization of Standardization (ISO) and ASTM test standards can falsely lead to assessing the fire inside test specimens as field conditions. The system was developed and tested in the early 2000s in accordance with BS476 Part 24 (1987). Part of the Lindab Thor Duct service for licensed manufacturers, is that we will engage with consultant engineers on any technical issues relating to the fire and smoke ductwork. ductwork (ducts, bends, reducers, T-pieces, endcaps, male and female couplings) made of galvanized steel sheet, duct thermal expansion joints, ILA-NSL-SMO-SIL and ILA- FLS-SMO-SIL. The important role of a thermal expansion compensator in a smoke extraction system should be emphasised. h5')>"^{uNCjDs+ HWM ? Adobe InDesign CS6 (Macintosh) Zwierzyniecka 8b00-719 Warszawa,Polska, EU Tax Id. At the start of the fire the smoke and heat extraction system is designed to remove products of combustion and smoke, and afterwards the generated heat as well. That short period can readily be enough if minimum Sheet Metal and Air Conditioning Contractors National Association (SMACNA) duct fabrication and supports are your design. Expect to do some j-box investigation and open circuit testing for validation of proper single point monitoring on the circuit. Further, consider that average hot layer temperatures may not be the only fire scenario that should be considered. Insulation is used to prevent flashover as hot gases pass through fire compartments. Do you intend to travel to industry events in 2022? You must have JavaScript enabled to enjoy a limited number of articles over the next 30 days. Be sure to have any approved self-test alternatives and the list of included devices as part of the special inspection report available at the FSCS for the life of the system. In case of fire and evaluation of sensors, these compartments are activated and extracted. The scope of application of smoke extraction ducts includes ventilation systems with operating pressure from -1500 Pa to +500 Pa. Equally unfortunate, the first stop on-site to the printer at the Firefighters Smoke Control Station (FSCS) too often reveals a repetitive series of faults for the same device(s) reporting week after week. There are several systems and methods Fyreguard can suggest to fire rate ducts, including boards, sprays and wraps. To start with, reduced cross sections wont meet design airflow rates. Monitoring power only at the last device on the power circuit can be accomplished though. xmp.did:D8FD03534E20681192B09F5B0D84B731 3. The last thing a fire crew need to encounter are secondary fires, as a result of our efforts to remove gases from the scene of the initial fire. EN 1366-10 smoke dampers are suitable for EN 1366-8 smoke ducts. Your top questions about kitchen extract answered here ? In-line dampers would indeed protect the shaft, but they will also interrupt the associated air service. Impurity content in the air [mg/m3] and health effect. Tecbor 30 mm. * Insulation values are obtained through the application of specific insulation (refer to Firetrace Ductwork ltd for required material specifications). Even if a zoned smoke control system by analysis needs only 20 minutes of functionality to meet egress requirements, does the risk to passive compartmentation matter after that? The product is tested to BS 476-24 (1987) and EN 1366-1 (2013) for up to 4 hours stability and integrity and up to 4 hours insulation (fire outside duct) and 2 hours insulation* (fire inside duct). Standard power wiring practices would not be suitable here. Individual duct sections and ventilation fittings of SMOKE system ducts may only be installed horizontally (vertical installation is not permitted). Any change requires an appropriate level of recommissioning at the time the change is made (NFPA 92, 8.7.1). That may be fine for general environmental air service, but a designer cant do that for life safety air services. FIGURE 4: A normal horizontal shaft offset.

SMOKEsystem components can also be used in combined installations, which simultaneously function as comfort ventilation and smoke extraction provided that when operating in the smoke extraction mode, they operate only in the fire zone in which they are installed. UNE EN 1366 Part 8 for multi-sector extraction ducts. A set of harmonised European Standards have been published for Smoke Control Ducts, however, it is only possible to classify insulated systems under the current regime. A smoke extract ductwork is an emergency system, and fire insulation will be able to handle the exhaust temperatures, having been proven in a fire test. For the most part, these sources of criteria are fairly consistent. Besides, smoke control systems only need to operate for a short period. The shaft is protected. For a smoke exhaust duct, a similarly direct internal exposure may indeed be happening as air is drawn by design into the duct. This duct is tested for multi-compartment applications. :PL5211068747 REGON:010685817 KRS:0000038889Authorized share capital: 334 500 z, Copyright 2022Alnor.All rights reserved, For more information aboutSMOKEsystem check our. Check your inbox for further instructions, DESIGN CONCEPT: design solutions for domestic ventilation, Art-Deco: design decorative ventilation grilles, Smoke extraction ventilation for parking premises, Round and flat folding PVC duct system "PLASTIFLEX", Flexible air ducts for ventilation and air conditioning, Air ducts for ventilation, heating and air conditioning, Determination of the Essential Air Exchange. This isnt the point of the weekly self-test. By all code paths, active system contributions, whether sprinkler for smoke control, were already considered in the setting of minimum fire-resistive requirements. 5. FIGURE 1: Proper power supervision.

Standard: UNE EN 1366-8 Remember, alternative protection must provide the same performance the fire damper would have for all probable fire scenarios, not just engulfment scenarios without duct openings. This information will pick up on my last article, Smoke Control Designed for Failure, and will be done with an eye toward looking beyond some typical design shortcuts that may well amount to failure. Smoke extract ductwork is required to retain 75 % of its cross sectional area within the fire compartment and neighbouring compartment, this is tested under BS 476 part 24. And, if one believes more is always better, then he or she may believe theyre acting in best-practice territory. Here are some of the most frequently asked questions that we get asked by M&E Contractors, installers and fire authorities about smoke extract, flashover, thermal insulation, and fire dampers. Thor Duct was formerly known as Safe 4 Fire Duct in the UK and Ireland. Recognize that if a smoke damper is ultimately deemed necessary, a designer must avoid the temptation to provide combination fire/smoke dampers in those locations under the more is better philosophy. LPS-SD198(appendix B12) This overly simplistic rationale is applied more often than one would hope, particularly when it comes to systems designated for two-hour performance commensurate with the protected shaft rating, e.g., stairwell (IBC 909.20.6.1) and elevator shaft pressurization systems (IBC 909.21.3). 2. Si sigues utilizando esta web sin cambiar tus ajustes de cookies o haces clic en "Aceptar" estars dando tu consentimiento a esto. Threaded rod. SMOKE system - Single Compartment Smoke Exhaust Ductwork. Keep in mind, throughout the U.S., designers and installers of smoke control systems are working under several layers of regulatory criteria, including the building and mechanical codes, which are likely based on the most recent edition of the International Code Council (ICC) available in the U.S. at this point in time. Fire resistance required to the fire compartment elements must be kept on the points where such elements are traversed by installation materials, such as cables, pipes, ducts, ventilation ducts, etc. Wiring faults, or circuit supervision, wont report a control damper that is malfunctioning. In either supply or exhaust ductwork, the interior unexposed temperature for ductwork is expected to reach somewhere in the range of ~400F according to the applicable test standards, even for insulated fire-rated duct systems. Sealing of the penetration point through the support work. It reduces heating load of the building construction, resulting in decreasing any follow-up damages to the equipment and building caused by hot gases and smoke. Email us now to obtain a quote for your requirements. 1 0 obj <>>> endobj 2 0 obj <>stream Its not just bad practice or even optional for that matter. Agreed upon means with the authority having jurisdiction (AHJ), in writing. Most of the smoke control systems end points are unable to be checked for proper functionality except when activated and not in the quiescent state. How about other smoke control systems? All or some of the following products may be used to configure a smoke extraction system: All male components of the SMOKEsystem smoke extraction ducts are equipped with double lip seals for GASK ventilation fittings made of EPDM and a 1.8mm thick and 10mm wide intumescent seal.The components of the SMOKEsystem round smoke extraction duct components meet the requirements of airtightness class D if all applicable OMs recommendations for correct installation, transport, storage, etc. FIGURES 8 & 9: Fire plume and ceiling jet effects versus the average hot layer. Higher temperatures and insulation are the significant differences between the two. Our systems also alleviate the inherent problems of damaging these coatings during logistics, assembly and installation, which compromises the fire resistance of a secondary coated system.

Its better to provide more than less, just in case. Smoke extraction ducts which handle: 1) a single fire zone only shall have a fire-resistance class based on E600 S fire and smoke resistance at least equal to that of the ceiling as defined in 216; it is also possible to use the E300 S class if the calculated temperature of the smoke generated during a fire does not exceed 300 C;2) several fire zones shall have the E I S fire resistance class, at least as high as that of the ceiling as specified in 216.". The Technical Building Code states in its Basis Document in case of fire SI 1, Interior Propagation, Section 3, Point 3: Tecresa Proteccin Pasiva, S.L. 72C is the normal fusible link temperature. Joints cemented with Grena Klebepaste, 2. Smoke control systems ductwork is categorized into two kinds of air service: Those that are expected to move products of combustion (smoke exhaust) and those that are expected to move supply air (makeup, airflow, or pressurization). In combined ventilation systems, the smoke extraction function is primary. The damper will close where there is no fire, and open to allow the gases to be exhausted from the scene of the fire. FIGURE 6 & 7: Proper and improper applications of fire-rated duct used as alternative protection. Besides, the test specimens were anything but minimum SMACNA construction and the document cant be referenced if it wasnt fully read and understood. Tecbor 30 mm plate to cover joints. zeWLCQCEKir8j,3E}#]G]o/?n@&o}Lk}kQN!K[ZF[_6*82fD0=Mhyx9.NYWz~ Engineering recommendations, No marked effect in case of exposure for several hours, Symptoms of light poisoning or mucous membrane irritation in 2-3 hours. 1. Adobe InDesign CS6 (Macintosh) They close for a fire inside the duct, for a fire outside the duct, and without regard for which side of the damper the heat originates. It is carbon monoxide poisoning that accounts for 80 % the fire accident causes. Rock wool 50 mm thick and density 145 Kg/m3. Our professional approach and continual investment in the training of our staff, technology systems and manufacturing plant ensure you receive the very best product and service. (Part 2), Smoke Control System Compliance Requires a Full Understanding of Fire-resistance Fundamentals. And although it may seem intuitive, this is also why we need to take care to validate proper implementation of the weekly self-test as part of system commissioning. The fire resistance of ducts decreases, increasing the risk of the duct losing its tightness and leaking smoke and heat. Does smoke extract ductwork need to be insulated on the roof? It is used to remove smoke from buildings, ships or offshore structures to enable emergency evacuation as well as improved firefighting.

They are tested for leakage to the same scrutiny as smoke ducts, and to the same flow rates during the test. One cant assume the fire plume and ceiling jet will always be over there somewhere away from the duct or openings in the duct. It is not sufficient to verify the breaker position or even power at the last device necessarily, if power to devices is t-tapped along the circuit, i.e., not looped back to the trunk path akin to an NFPA 72 IDC circuit routing method. Ventilation ducts must be non-combustible and meet a number of requirements covered by the harmonised standard EN 12101-7 (Smoke and heat control systems.

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