Do you struggle to understand smoke control for fire alarm systems? No need to stress out as you are not alone. Let's break it down so it is easier to digest.
Smoke control is a vital aspect of fire protection engineering that aims to prevent the spread of smoke and toxic gases in buildings during a fire. Smoke control systems use various strategies, such as mechanical ventilation, pressurization, and compartmentation, to limit the movement of smoke and protect the occupants and property from its harmful effects. In this blog post, you will learn about the principles, design, and applications of smoke control systems, as well as the relevant codes and standards that govern their performance. You will also find some useful resources and references to help you further explore this topic. Whether you are a fire protection engineer, a building owner, an installer, or a curious reader, this blog post will provide you with valuable insights into the science and practice of smoke control.
Fire alarm systems?are essential for the activation and operation of smoke control systems. Fire alarm systems can detect the presence of fire and smoke, alert the occupants and the fire department, and initiate the appropriate smoke control actions. Fire alarm systems can also monitor the status and performance of smoke control systems and provide feedback and control signals to the building management system. Fire alarm systems should be listed, compatible and integrated with the smoke control systems to ensure coordinated and effective response to fire emergencies.
Smoke control systems are complex and require careful design, installation, and maintenance. Smoke control systems should be based on a thorough analysis of the fire hazards, the building characteristics, the occupant needs, and the fire department operations. This approach is referred to as a smoke control report or rational analysis and is required to be completed by a registered fire protection engineer (FPE) per the International Building Code 2021 Section 909.4. The rational analysis?or smoke control report will cover which type of smoke control system will be employed (passive vs. mechanical), which smoke control method will be utilized (pressure, exhaust, or air flow), construction?methods, sequence of operation and inspection and testing procedures. There are other items?covered within the report such as but not limited?to stack effect, temperature effect of fire, wind effect, climate and duration of operation.?
What Codes and Standards Dictate Smoke Control Systems?
Smoke control systems are required?and regulated by?codes and standards?that specify the performance requirements, design criteria, installation methods, and testing procedures for different types of buildings and occupancies. Some of the codes and standards that address smoke control systems are as follows: - 2021 International Building Code (IBC) Chapter 9: Fire Protection and Life Safety? ? Systems - ASHRAE Handbook of Smoke Control Engineering - NFPA 92: Standard for Smoke Control Systems - NFPA 101: Life Safety Code - NFPA 72: National Fire Alarm and Signaling Code
- Underwriters Laboratories, UUKL, Smoke Control Equipment (ANSI/864 units for?fire protective signaling systems)
Where are Smoke Control Systems Required per Code?
Atriums (three stories or more) within covered malls - IBC 2021 Section 402.7.2.
High-Rise Buildings - IBC 2021 Section 403.4.7.
Atriums?(three stories or more) - IBC 2021 Section 404.5.
Windowless Buildings Group I-3 - IBC 2021 Section 408.9
Large Stages (Greater than 1,000sq' in Area or 50' in Height) - IBC 2021 Section 410.2.7.
Smoke control systems can be classified into two main types: passive and mechanical.
Passive smoke control systems rely on the buoyancy and pressure differences of smoke and air to create ventilation openings that allow smoke to escape and fresh air to enter. Examples of natural smoke control systems are automatic opening vents (AOVs), atrium exhausts, opposed airflow, and smoke reservoirs.
Openings are protected by automatic?closing?equipment or devices.Fire Dampers and Combination Fire Smoke DampersFire Rated Doors with Magnetic Hold Open Devices (Door Holders)
Activation - Consult?the Approved Rational Analysis / Smoke Control?Report.Smoke Detectors / Heat?Detectors located at fire rated doors and combination fire smoke?dampers.Duct Smoke Detectors located at HVAC units for shutdown and combination fire smoke?dampers.?
Verification NOT required.Positive?status of fan shutdown, door closure or damper activation is not required per IBC 2021 Section 909.12.1. Consult the rational?analysis as it may supersede?this code section.?
Wiring In addition to the requirements?of NFPA 70, all wiring regardless of voltage shall be fully enclosed within a continuous raceway.
Mechanical smoke control systems use fans, dampers, ducts, and other devices to create pressure differences and airflow patterns that control the direction and speed of smoke movement. Examples of mechanical smoke control systems are pressurization method, exhaust method, and air flow method systems.
Pressurization Method - IBC 2021 Section 909.6. This approach utilizes pressure differences across smoke barriers to maintain a tenable environment zones adjacent to the smoke control zone of origin.?Per IBC 2021 section 909.6.1, the minimum pressure across the smoke barriers is 0.05" water gauge.?The maximum pressure differential is dependent upon the opening force of exit doors. Per IBC 2021 section 1010.1.3 #2, the door shall not require more than 30 pounds of force to set in motion and 15 pounds to fully open.?Required to have complete automatic control 2021 IBC section 909.12.3.1.In addition to the requirements?of NFPA 70, all wiring regardless of voltage shall be fully enclosed within a continuous raceway.
Smoke Control Pressurization Method Detail
Smoke Control Pressurization Method Detail
Exhaust Method - IBC 2021 Section 909.8. Where approved by the AHJ, the exhaust method may be utilized in large areas such as atriums or malls. Large smoke exhaust fans are utilized to evacuate smoke from the area. Makeup air (MAU) fans, automatic windows or doors may be used to replace air removed from the space by process of the smoke exhaust fan. When the smoke control exhaust method is utilized, the system must keep the smoke layer at least six feet above the highest level meant for egress within the smoke zone. Smoke Control Systems utilizing the exhaust method shall be designed in accordance with NFPA 92.Required to have complete automatic control 2021 IBC section 909.12.3.1.In addition to the requirements?of NFPA 70, all wiring regardless of voltage shall be fully enclosed within a continuous raceway.
Smoke Control Exhaust Method Detail
Smoke Control Exhaust Method Detail
Air Flow Method - IBC 2021 Section 909.7. Where approved by the AHJ, the air low method is used for facilities with smoke migration through openings that are in the permanently open position. Airflow shall be directed to limit smoke migration from the zone. Airflow shall not exceed 200 feet per minute. Smoke Control Systems utilizing the air flow method shall be designed in accordance with NFPA 92.
This method shall not be employed where either?the quantity?of air or the velocity of the airflow will adversely affect other portions of the smoke control system, intensify?the fire, disrupt smoke plume dynamics or interfere with exiting. Airflow towards?the fire shall not exceed 200 feet per minute. Where the calculated airflow exceeds this limit, the airflow method shall NOT be used. 909.7.1.Required to have complete automatic control 2021 IBC section 909.12.3.1.In addition to the requirements?of NFPA 70, all wiring regardless of voltage shall be fully enclosed within a continuous raceway.
Smoke Control Air Flow Detail
Smoke Control Airflow Method Detail
Duration of Operation
2021 IBC Section 909.4.6 states that all portions of active or engineered smoke control systems shall be capable of continued operation after detection of the fire event for a period of not less than either 20 minutes or 1.5 times the calculated egress time, whichever is greater.?
What is Verification or Positive Status?
Smoke control equipment utilized in a mechanical smoke control system will be required to comply with IBC 2021 Section 909.12.1 "Verification". This is also known as positive status. This is the process of utilizing fire alarm monitoring modules to supervise the activation of fans, dampers and doors in a smoke control event. The fire alarm monitor modules can be connected to variable frequency drives (VFDs), end switches, pressure differential switches, and current switches. These components provide contact closure to trip the associated fire alarm monitoring module to prove the fan, damper, or doors activated as intended per the approved rational analysis or smoke control port.??
Smoke Control Verification Equipment
Smoke Control Positive Status Equipment
Examples of how positive status forsmoke control systemcan be wired to a fire alarm monitoring module. In these examples, a Notifier FDM-1 addressable dual monitor module is used to show how to wire up a damper actuator end switch for normally open and normally closed conditions.?
Damper Positive Status Normally Open
Fire Smoke Damper Status Monitoring Open Detail
Damper Positive Status Normally Closed
Fire Smoke Damper Status Monitoring Open Detail
There is more to smoke control verification.
Another requirement for verification is a preprogrammed weekly self test sequence that shall report abnormal conditions audibly, visually, and by printed report. The pre-programmed weekly test shall operate ALL devices equipment and components used for the smoke control system.
Exception:
Where verification of individual components tested through the preprogrammed weekly testing sequence will interfere with, and produce unwanted effects to, normal building operation, such individual components are permitted to be bypassed from the preprogrammed weekly testing, when approved by the AHJ and in accordance with BOTH of the following:
Where the operation of components is bypassed from the preprogrammed weekly test, presence of power downstream of all disconnects shall be verified weakly by a listed control unit.
Testing of all components bypassed from the preprogrammed weekly test shall be in accordance with section 909.20.6 of the International Fire Code IFC.
Example of a UL Listed Smoke Control Printer for Weekly Testing Reports
Fire Fighter's Smoke Control Panel
A fire fighter's smoke control?panel for first responder?purposes ONLY shall be provided and include manual?control or override of automatic control for mechanical?smoke control systems. If the facility is a high-rise?structure?or equipped with smoke protected assembly?seating, the fire fighter's?smoke control panel?shall be installed with the?fire command center (FCC). For all other buildings?that may require?a smoke control?system, the fire fighter's smoke?control?panel shall be installed in an area approved by the AHJ adjacent to the fire alarm control panel. 2021 IBC Section 909.16.
Smoke Control Indication LEDs
All fans, dampers and other operating equipment shall be depicted on the fire fighter's smoke control panel along with clear indication of the airflow. Status indicators shall be included for all smoke control equipment annunciated?by fan, damper and or zone. 2021 IBC Section 909.16.1.
Fans, Dampers and Other Operating Equipment NORMAL status = WHITE
Fans, Dampers and Other Operating Equipment OFF or CLOSED status = RED
Fans, Dampers and Other Operating Equipment ON or OPEN status = GREEN
Fans, Dampers and Other Operating Equipment FAULT status = AMBER/YELLOW
Smoke Control Switches
The following switches shall be provided on the smoke control panel to provide control capability over the complete smoke control equipment with the building: 2021 IBC Section 909.16.2
ON-AUTO-OFF control over each individual piece of operating smoke control equipment that can be controlled from other sources within the building. This?can include: stair pressure fans, smoke exhaust fans, supply fans, return fans, exhaust fans, elevator?shaft fans, and other operating equipment used or intended for smoke control purposes.?
Smoke Control Fan Control Switch
Smoke Control On-Auto-Off FAN Switch
ON-AUTO-OFF control over individual dampers relating to smoke control and that are controlled from other sources within the building.
Smoke Control Damper Status Switch
Smoke Control On-Auto-Off DAMPER Switch
ON-OFF or OPEN-CLOSED control over smoke control and other critical equipment associated with a fire or smoke emergency and that can only be controlled from the fire fighters smoke control panel.?
Smoke Control ON-OFF Switch
Smoke Control On-Off DOOR Switch
Exceptions:
For complex systems (where approved), controls and indicators can be combined to control and indicate all components?of a single smoke zone as a single unit. This?allows for one switch to control multiple doors, dampers or fans within a single?smoke zone. Example: Five dampers?on the 10th floor that are all required to close upon smoke mode activation?could be controlled?and indicated on a single switch with LEDs on the 10th floor of the fire fighter's?smoke control?panel. 2021 IBC Section 909.16.2
The?ON-OFF and OPEN-CLOSE switches shall have the highest priority over any control point within the building. Once automatic or manual?control has been initiated from the fire fighter's smoke control?panel, any other point in the building shall NOT contradict?the control action. The only exception is power disconnects required by NFPA 70 is the only exception.
The AUTO position on three-position?switches?shall allow automatic or manual?control action from other control points within?the building. The AUTO position is the normal nonemergency position.?
Fire Fighter's Smoke Control Example
Fire Fighter's Smoke Control Panel
Fire Fighter's Smoke Control Panel
Smoke Control System Response?Time
Per 2021 IBC section 909.17, upon receipt?of an alarm condition at the fire alarm control?panel fans, dampers, and automatic doors shall have achieved their proper operating state and the final status shall be indicated at the smoke control panel?within 90 seconds.?
Power Requirements
Standby Power Requirements per section 2702.2.17 of the 2021 IBC states that standby power shall be required for smoke control systems per sections 404.7, 909.20.7.2, and 909.21.5.
Per section 909.12.1 the smoke control system shall monitor for the presence of power downstream of all disconnects. This?will require a monitor module as well as an isolation?relay?(PR-1 or MR-101) at each power source. Make sure to pay attention to DAMPERS. A lot of the systems today will have a light switch adjacent to the damper actuator for the purpose of dropping power to the unit for service. If this is the case, you will need a monitor module and relay at each of these locations. Pay attention to this when bidding a project as this could potential?add quite a few more modules than you may have accounted for.
How are smoke control systems commissioned and tested??
Per the 2021 International Building Code Section 909.3,?smoke control systems?shall undergo special inspections and testing in place to verify the proper commissioning of the smoke control design in its final installed condition. As noted above, the rational analysis or smoke control report is required to include procedures that shall be used during the testing and commissioning process.?
Per the 2021 IBC, Section 1705.19, Smoke Control Systems shall be tested by a?special inspector.?As defined by the 2021 IBC Definitions, a?special inspector?is a qualified person employed or retained?by an approved agency and approved by the building official?as having the competence necessary to inspect a particular type of construction requiring?special?inspection.?
Per the 2021 IBC, Section 1705.19.1, the Smoke Control Testing Procedure shall include:During erection of ductwork and prior to concealment for the purpose of leakage testing and recording of device and equipment locations. This includes but not limited?to fans, dampers, smoke detectors, waterflow?switches, and verification?equipment as outlined above.Prior to occupancy and after sufficient completion for the purpose of pressure differential testing, air flow measurements and detection and control verification.?
Per 2021 IBC, Section 1705.19.2, approved agencies for smoke control testing shall have expertise in fire protection engineering, mechanical engineering, and certification in air balancing.?
Reports
Per 2021 IBC Section 909.18.8.3, A complete report of testing shall be prepared by the approved agency. The report shall include identification of all devices by manufacturer, nameplate data, design values, measured values, and identification tags. Your hope shall be reviewed by the responsible registered design professional and, when satisfied that the design intent has been achieved the responsible registered design professional shall sign seal and date the reporter.
A copy of the final report shall be given to the fire code official?along with an identical?copy to be filed in an approved location at the facility. 2021 IBC 909.18.3.1.
Charts drawings and other documents identifying and locating each component of the small control system as well as describing its proper function and maintenance requirements shall be maintained on file at the building and accompany the report required by section 909.18.8.3. Devices shall have an approved identifying tag on them consistent with the other required documentation and shall be dated indicating the last time they were successfully tested and by whom.
System?Acceptance
2021 IBC Section 909.19 states, buildings that are required by this code to employ a smoke control system shall not be issued a certificate of occupancy until such time that the AHJ determines the provisions of chapter 909 have been fully complied with and that the fire department has received ample instruction on the operation both automatic and manual operation of the smoke control system. In addition, a written maintenance program complying with the requirements of section 909.20.1 of the International Fire Code (IFC) has been submitted and approved by the AHJ.
Plan on at least three inspections?to commission a smoke control system.
Pre-Test the system. Just like a fire alarm system, the sequence?and equipment must be ran through prior to calling out the AHJ. The?pre-test shall be conducted once all of the power is present, doors are installed, and all fire alarm/smoke control?components are in place and programmed per the rational analysis, sequence of operations?and approved documentation. Verify all indicators on the fire fighter's smoke control panel as well as manual?and automatic operation.?
Test with the third-party fire protection firm. Please note this can be the same firm that performed the rational analysis pending they have sufficient?training?and expertise in testing and commissioning?smoke?control systems. Depending on the individual conducting?the third-party test you may have different?requirements. However, you should still run through everything?you tested during the pre-test as well as the pre-programmed weekly?self-test. At the end of this test, the third party testing firm will issue a report per section 909.18.8.3 and give it to the Fire?Code Official.?
Final inspection with the AHJ / Fire Code Official. Once?the third-party testing firm has issued their report, the AHJ will want to?run through?a final test. It is up to the AHJ on what will be tested. In my experience, some AHJs will trust the third-party testing?firm and perform?minimal testing to satisfy their?needs. However, some AHJs will want to run through a complete test of all components. Keep this in mind when bidding projects as these tests can take quite a while depending on their?complexity.?
Thank you for the article. I have a question on the verification requirements per IBC. Codes calls out positive confirmation of actuation, test sequence, manual override, and the presence of power downstream of all disconnects. I can see how this applies to fans and dampers since the manual override would turn them on/off or open/ close. So both actuations need to be verified. My question is on boundary fire doors and shutters that need to be closed. As these doors will not be opened from the system control panel, do the doors need to be monitored for an open condition or only the closed position? I would think that a single door status contact could be used to verify that the door did close. If the contact is not showing closed, the door would be open. Whether it is fully open does not mater as it would be a fault on the system if not closed. The panel would still need (4) LEDS for the door: W R Y G.
Good work Kyle, this will certainly help those not as familiar with smoke control, it's permutations and complexities. While you reference primarily IBC 909 and IBC 400 (which are special occupancy usage classifications), readers should also note that the initial occupancy classifications is determined in IBC 300. Then any special applications, like high-rise buildings, Prisons, Atria or theaters will be further defined in IBC 400. Also, IBC 700 defines most of the passive smoke protection requirements which are also part of the smoke control design. i.e. fire stopping, smoke proof enclosures, smoke barriers and partitions etc. IBC 900 in the front sections have the required systems defined, fire alarm, sprinkler, fire pumps etc which are also considered indirect components of the entire system. I put together this slide to help individuals understand the roles and responsibilities of all stakeholders in the design, installation, commissioning and test/inspect process. It's never helpful when finger pointing happens on a project, at least we should know who is responsible for each scope of work and address them professionally. I hope this is helpful for those who see your informative work and read on for further education.
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3 周Thank you for the article. I have a question on the verification requirements per IBC. Codes calls out positive confirmation of actuation, test sequence, manual override, and the presence of power downstream of all disconnects. I can see how this applies to fans and dampers since the manual override would turn them on/off or open/ close. So both actuations need to be verified. My question is on boundary fire doors and shutters that need to be closed. As these doors will not be opened from the system control panel, do the doors need to be monitored for an open condition or only the closed position? I would think that a single door status contact could be used to verify that the door did close. If the contact is not showing closed, the door would be open. Whether it is fully open does not mater as it would be a fault on the system if not closed. The panel would still need (4) LEDS for the door: W R Y G.
Founder and Owner at Fire Detection Unlimited, Inc.
1 年Great work Kyle!
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1 年Good work Kyle, this will certainly help those not as familiar with smoke control, it's permutations and complexities. While you reference primarily IBC 909 and IBC 400 (which are special occupancy usage classifications), readers should also note that the initial occupancy classifications is determined in IBC 300. Then any special applications, like high-rise buildings, Prisons, Atria or theaters will be further defined in IBC 400. Also, IBC 700 defines most of the passive smoke protection requirements which are also part of the smoke control design. i.e. fire stopping, smoke proof enclosures, smoke barriers and partitions etc. IBC 900 in the front sections have the required systems defined, fire alarm, sprinkler, fire pumps etc which are also considered indirect components of the entire system. I put together this slide to help individuals understand the roles and responsibilities of all stakeholders in the design, installation, commissioning and test/inspect process. It's never helpful when finger pointing happens on a project, at least we should know who is responsible for each scope of work and address them professionally. I hope this is helpful for those who see your informative work and read on for further education.