Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Smoke Control Systems
…207 unchanged lines
### The exhaust method shall remove smoke from the large-volume space at a rate derived from plume calculations in accordance with NFPA 92, with make-up air introduced at low level at a velocity that does not disrupt the smoke plume.
−### The design fire heat release rate used for plume and exhaust calculations shall be documented and justified in the basis of design, because exhaust rate is highly sensitive to the assumed fire size and an unjustified default value yields an under- or over-designed system. {note}
+### The design fire heat release rate used for plume and exhaust calculations shall be documented and justified in the basis of design, because exhaust rate is highly sensitive to the assumed fire size and an unjustified default value yields an under- or over-designed system.
### Make-up air velocity at the make-up air openings shall not exceed the limit established by NFPA 92 to avoid deflecting or disrupting the smoke plume.
…106 unchanged lines
## Elevator hoistways connect every floor of a building through a continuous vertical shaft and can act as a chimney that distributes smoke building-wide; pressurizing the hoistway holds smoke out of the shaft and protects the elevators used by occupants and the fire service. {note}
−## Elevator hoistway pressurization shall be provided where required by the adopted building code, including high-rise and underground conditions; omitting hoistway pressurization where the code triggers apply is a common and consequential design oversight. {note}
+## Elevator hoistway pressurization shall be provided where required by the adopted building code, including high-rise and underground conditions; omitting hoistway pressurization where the code triggers apply is a common and consequential design oversight.
### Elevator hoistway pressurization shall maintain the design pressure difference across the hoistway entrance at the served floors.
…39 unchanged lines
### Smoke exhaust fan motors and controls shall be connected to the emergency power supply system in accordance with NFPA 110.
−### Fans and fan accessories common to comfort and smoke service shall additionally comply with [[sync/hvac-fans]]. {note}
+### Fans and fan accessories common to comfort and smoke service shall additionally comply with [[sync/hvac-fans]].
```datasheet
…53 unchanged lines
### Smoke dampers shall be UL 555S listed at the specified blade leakage class and actuator temperature rating.
−### The smoke damper leakage class shall match the barrier leakage assumed in the smoke control design, because a leakier damper than assumed defeats the pressure differential the design relies on. {note}
+### The smoke damper leakage class shall match the barrier leakage assumed in the smoke control design, because a leakier damper than assumed defeats the pressure differential the design relies on.
−### Smoke damper leakage classes are defined by ANSI/AMCA 500-D, where Class I is the tightest and Class III the loosest; Class I or Class II is typical for smoke control service. {note}
−
−### The smoke damper actuator and assembly temperature rating shall be selected for the maximum smoke temperature expected at the damper location.
−
−### Smoke dampers on an exhaust path that may carry hot smoke shall be rated for elevated temperature, because exhaust smoke in a fully developed fire can exceed the standard 250°F rating and a standard-rated actuator may fail in service. {note}
−
−### Combination fire/smoke dampers shall be provided where a smoke control damper occurs at a rated fire barrier, and shall be listed under both UL 555 and UL 555S.
−
−### Damper actuators shall fail to the position required by the smoke control sequence on loss of power or control signal.
−
−### Smoke damper actuators shall be electric where required to support the supervised, addressable control and position feedback required by the smoke control panel.
−
−### Dampers, sleeves, and access provisions common to general HVAC service shall additionally comply with [[sync/louvers-and-dampers]]. {note}
−
```datasheet
label: Smoke Damper Leakage Class (AMCA 500-D)
…6 unchanged lines
```
+### Smoke damper leakage classes are defined by ANSI/AMCA 500-D, where Class I is the tightest and Class III the loosest; Class I or Class II is typical for smoke control service. {note}
+
+### The smoke damper actuator and assembly temperature rating shall be selected for the maximum smoke temperature expected at the damper location.
+
```datasheet
label: Smoke Damper Temperature Rating (UL 555S)
…5 unchanged lines
```
+### Smoke dampers on an exhaust path that may carry hot smoke shall be rated for elevated temperature, because exhaust smoke in a fully developed fire can exceed the standard 250°F rating and a standard-rated actuator may fail in service.
+
+### Combination fire/smoke dampers shall be provided where a smoke control damper occurs at a rated fire barrier, and shall be listed under both UL 555 and UL 555S.
+
```datasheet
label: Damper Type
…5 unchanged lines
```
−```datasheet
−label: Damper Actuator Type
−type: select
−options:
− - Electric, two-position
− - Electric, modulating
−default: Electric, two-position
−```
+### Damper actuators shall fail to the position required by the smoke control sequence on loss of power or control signal.
```datasheet
…7 unchanged lines
```
+### Smoke damper actuators shall be electric where required to support the supervised, addressable control and position feedback required by the smoke control panel.
+
+```datasheet
+label: Damper Actuator Type
+type: select
+options:
+ - Electric, two-position
+ - Electric, modulating
+default: Electric, two-position
+```
+
+### Dampers, sleeves, and access provisions common to general HVAC service shall additionally comply with [[sync/louvers-and-dampers]]. {note}
+
# Smoke Barriers and Opening Protectives {toc}
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### Artificial bottom seals shall not be installed on doors in pressurized installations, because such seals are prohibited by NFPA 105 for these assemblies and can mask leakage assumed in the design. {note}
−### As-built smoke barrier leakage shall be consistent with the values assumed in the smoke control design; field hardware, door undercuts, and unsealed penetrations frequently exceed design assumptions and cause acceptance pressure differences to fail. {note}
+### As-built smoke barrier leakage shall be consistent with the values assumed in the smoke control design; field hardware, door undercuts, and unsealed penetrations frequently exceed design assumptions and cause acceptance pressure differences to fail.
### Penetrations of smoke barriers serving the smoke control system shall be sealed to maintain the barrier leakage assumed in the design.
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# Ductwork and Leakage {toc}
−## Smoke control ducts operate at the elevated pressures the fans develop and must hold those pressures with low leakage, because duct leakage is a direct loss of the airflow the design depends on and is checked by a dedicated pressure test. {note}
+## Smoke control ducts operate at the elevated pressures the fans develop and must hold those pressures with low leakage, because duct leakage is a direct loss of the airflow the design depends on and is checked by a dedicated pressure test.
### Smoke control duct construction shall be rated for the maximum operating pressure of the smoke control system in accordance with the adopted mechanical code.
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### Where the smoke control function is integrated with the fire alarm control unit, the fire alarm control unit and its smoke control modules shall carry the UL 864 UUKL listing.
+```datasheet
+label: Control Panel Architecture
+type: select
+options:
+ - Dedicated standalone UL 864 UUKL panel
+ - Integrated with UL 864 UUKL fire alarm control unit
+default: Dedicated standalone UL 864 UUKL panel
+```
+
### A non-dedicated system that reconfigures shared HVAC equipment for smoke control shall provide UL 864 UUKL-listed controls for all shared components, because standard building automation controls on shared equipment used for smoke control do not satisfy the listing requirement and will be rejected at inspection. {note}
…4 unchanged lines
### The FSCS override hierarchy shall provide, at minimum, automatic mode, manual on, and manual off control of each function, with manual override taking precedence over automatic control.
+```datasheet
+label: FSCS Override Modes
+type: checkbox
+options:
+ - Automatic
+ - Manual on
+ - Manual off
+default:
+ - Automatic
+ - Manual on
+ - Manual off
+```
+
### A graphic-annunciator FSCS shall present a backlit graphic representation of the building with status indication and override controls keyed to the smoke control zones.
### A switch-based FSCS shall present a labeled matrix of override switches with status indication for each function.
−### The division of the FSCS scope between the fire alarm installer and the mechanical controls installer shall be coordinated and assigned so that programming, wiring, and status interfaces are complete with no gaps. {note}
+### The division of the FSCS scope between the fire alarm installer and the mechanical controls installer shall be coordinated and assigned so that programming, wiring, and status interfaces are complete with no gaps.
### Fire alarm initiation, detection, and interface devices that activate the smoke control system are specified in [[sync/fire-alarm-systems]], and the smoke control interface with general building controls is coordinated with [[sync/building-automation-system]]. {note}
−```datasheet
−label: Control Panel Architecture
−type: select
−options:
− - Dedicated standalone UL 864 UUKL panel
− - Integrated with UL 864 UUKL fire alarm control unit
−default: Dedicated standalone UL 864 UUKL panel
−```
+### The firefighter's smoke control station type shall be specified, consistent with its interface to the fire alarm control unit and smoke control modules.
```datasheet
…6 unchanged lines
```
−```datasheet
−label: FSCS Override Modes
−type: checkbox
−options:
− - Automatic
− - Manual on
− - Manual off
−default:
− - Automatic
− - Manual on
− - Manual off
−```
−
# Sequence of Operation {toc}
…8 unchanged lines
### Dedicated smoke control systems shall perform an automatic self-test of all smoke control functions at intervals not exceeding seven days in accordance with UL 864.
−### The weekly automatic self-test sequence and its programming scope shall be included in the smoke control specification and controls programming, because omitting the self-test sequence is a frequent gap that generates requests for information at commissioning. {note}
+### The weekly automatic self-test sequence and its programming scope shall be included in the smoke control specification and controls programming, because omitting the self-test sequence is a frequent gap that generates requests for information at commissioning.
### The result of each automatic self-test shall be logged and any failure shall be annunciated at the FSCS and the fire alarm system.
…63 unchanged lines
### Special inspection of the smoke control system shall be performed by a qualified agency in accordance with the adopted building code.
−### Air balancing of smoke control airflows shall be coordinated with [[sync/testing-adjusting-and-balancing]]. {note}
+### Air balancing of smoke control airflows shall be coordinated with [[sync/testing-adjusting-and-balancing]].
```datasheet
…49 unchanged lines
### Control panels and the FSCS shall be protected from moisture and construction dust before and after installation.
−### Damaged listing labels or rating tags shall be cause for rejection, because the listing and temperature rating cannot be verified without them. {note}
+### Damaged listing labels or rating tags shall be cause for rejection, because the listing and temperature rating cannot be verified without them.
# Warranty {toc}
…42 unchanged lines
- Spare indicating lamps / LEDs
```