large scale smoke control ducting in a commercial building

Smoke Control System Design for Commercial Buildings

When a fire occurs, smoke is often the greatest life-safety threat. A properly engineered smoke control system helps maintain tenable conditions in critical egress paths, supports firefighter operations, and reduces smoke migration that can impact occupants and property. Zari Consulting Group provides smoke control system design and smoke control engineering services for commercial buildings of all types.

We support projects nationwide with design and documentation that helps owners, architects, and contractors move through plan review and commissioning with fewer surprises.

What Is a Smoke Control System?

A smoke control (or smoke management) system uses mechanical and/or natural methods to manage smoke movement during a fire event. Depending on the building and code requirements, smoke control may involve:

  • Stair pressurization to protect exit stairs and support safe evacuation
  • Mechanical smoke exhaust for atriums, large volumes, and special spaces
  • Zoned smoke control to limit smoke migration between building areas
  • Smoke containment strategies using barriers, dampers, and pressure differentials
  • Integration with fire alarm and smoke detection sequences

Because smoke control touches HVAC, fire alarm, architecture, and power systems, it requires careful coordination and clear documentation to pass plan check and function as intended in an emergency.

Smoke Control Engineering Services

Zari Consulting Group provides comprehensive smoke control consulting and engineering services, including:

  • System design and basis-of-design development tailored to your building type and use
  • Code compliance strategy and AHJ-facing documentation for plan review
  • Smoke control rational analysis support (where required) and design narratives that clarify system intent
  • Risk assessment to identify smoke migration pathways, pressure risks, and operational vulnerabilities
  • Sequence of operations and integration support (fire alarm, HVAC controls, dampers, generators)
  • Design-phase commissioning coordination, including acceptance documentation review and functional testing planning.,/strong> Construction-phase testing and special inspections are provided through our Smoke Control Testing & Special Inspection service.

Whether your project requires a new smoke control system or updates to an existing system, we help align life-safety goals, code requirements, and buildable MEP solutions.

Smoke Control Rational Analysis

Many smoke control systems require a Smoke Control Rational Analysis as part of the design and permitting process. Required by the International Building Code (IBC) and NFPA 92 for many smoke control applications, the rational analysis documents the engineering basis for the system and demonstrates how the proposed design will achieve the intended life-safety objectives.

Zari Consulting Group prepares comprehensive rational analyses that support plan review and help owners, architects, and contractors demonstrate code compliance. Depending on the project, a rational analysis may include:

  • Applicable code analysis based on the adopted International Building Code (IBC), NFPA 92, and local amendments
  • Design fire assumptions and performance objectives used to establish system criteria
  • Smoke management strategy, including smoke exhaust, smoke containment, zoned smoke control, or stair pressurization
  • Airflow and pressure calculations supporting system sizing and performance
  • Sequence of operations describing system response during a fire event
  • Acceptance testing criteria to facilitate future commissioning and AHJ approval

A well-developed rational analysis helps reduce plan review comments, improves coordination among design disciplines, and establishes a clear roadmap for commissioning and special inspection.

Which Buildings Require Smoke Control System Design?

Smoke control systems are typically required where the International Building Code (IBC) mandates smoke management to maintain tenable conditions for occupant egress and firefighter operations. Zari Consulting Group frequently designs smoke control systems for projects including:

  • High-rise buildings with stair pressurization systems
  • Atriums and large-volume spaces
  • Mixed-use buildings where smoke migration between occupancies is a concern
  • Hospitals and healthcare facilities
  • Airports, arenas, and large assembly occupancies
  • Underground structures and enclosed parking facilities
  • Renovations and tenant improvements that modify HVAC systems, shafts, smoke compartments, or means of egress

Smoke control requirements vary based on building occupancy, height, volume, and the adopted building code. Our Fire Protection Engineers evaluate each project individually to determine whether active smoke control, stair pressurization, smoke exhaust, or other smoke management strategies are required to achieve code compliance and support life safety objectives.

Smoke Control Modeling and Performance-Based Design

Complex buildings often require engineering analysis beyond prescriptive code provisions. Zari Consulting Group can develop smoke control strategies using engineering calculations and performance-based design principles to evaluate smoke movement and support occupant tenability.

Depending on project requirements, our engineers may utilize:

  • Computational Fluid Dynamics (CFD) modeling to evaluate smoke movement under design fire scenarios
  • Performance-based engineering analyses for unique architectural conditions
  • Tenability evaluations to assess visibility, temperature, and smoke layer conditions during occupant evacuation
  • Atrium smoke exhaust analysis and large-volume smoke management studies
  • Stair pressurization calculations to maintain protected means of egress
  • HVAC integration reviews to coordinate smoke control sequences with mechanical systems

These engineering analyses allow design teams to develop smoke control solutions that satisfy project-specific performance objectives while supporting code compliance and occupant life safety.

Why Smoke Control Projects Get Delayed (and How We Prevent It)

Many smoke control delays occur when system intent is not clearly documented or when integration requirements are discovered late in the project. Zari Consulting Group helps reduce redesign cycles by:

  • Coordinating early with architectural and MEP design decisions that affect smoke zones, shafts, and pressure boundaries
  • Clarifying sequences so contractors and commissioning teams can test reliably
  • Producing reviewer-friendly documentation that explains how the system meets code intent
  • Aligning controls and power considerations to support emergency operation

Hire a Smoke Control Engineer

If you need smoke control system design, engineering support, or commissioning coordination, Zari Consulting Group is ready to help. We support projects in all 50 states and have regional offices throughout the country.

Call: (888) 779-3397
Or: Use the form on this page to request an SOQ or speak with a smoke control engineer.

Contact us today to get started.

Smoke Control System Design FAQ

What is the difference between smoke control and smoke exhaust?

Smoke control is the broader strategy used to manage smoke movement and maintain tenable conditions. Smoke exhaust is one method within that strategy—using mechanical or natural exhaust to remove smoke from a space.

When is a smoke control system required?

Requirements vary by building type, height, configuration, and local code adoption. Smoke control is commonly required for high-rise buildings, atriums, and certain large-volume or complex buildings where smoke migration presents a life-safety risk.

What is a smoke control rational analysis?

A rational analysis is a technical narrative (and supporting design basis) that explains how the smoke control system meets the code intent. It typically documents smoke control method, assumptions, system operation, and testing/acceptance considerations.

Do smoke control systems need to integrate with the fire alarm system?

Often, yes. Smoke control operation is commonly initiated or supervised through fire alarm inputs and sequences of operation. Coordination between fire alarm, HVAC controls, and dampers is critical for reliable performance.

What is stair pressurization and why is it important?

Stair pressurization uses fans and pressure control to reduce smoke entry into exit stairs during a fire. It helps protect egress routes and supports safe evacuation and firefighter access.

Can you help with commissioning and acceptance testing?

Yes. We support functional testing coordination, documentation review, and acceptance readiness so the system can be verified under the required test conditions.

Can an existing smoke control system be evaluated or upgraded?

Yes. We can assess existing system performance, identify documentation and control gaps, and help develop an upgrade strategy—especially during renovations or changes to HVAC zoning and building layouts.

What causes smoke control permitting delays?

Common causes include unclear sequences of operation, incomplete integration details (controls, dampers, power), and documentation that does not clearly demonstrate code intent. Early coordination and clear narratives reduce delays.