Smoke Control Design Calculator

Smoke exhaust and pressurization for high-rise buildings.

System mode

Design fire size (kW)

Clear height above fire (m)

Atrium floor area (m²)

Ambient temperature (°C)

Number of stairwells

Tab to move between fields

Exhaust/supply rate (CFM)

40,667

Exhaust rate (m³/min)1,151.6

Smoke mass flow (kg/s)18.26

Smoke layer temp (°C)97

Pressure differential (Pa)0

Makeup air (CFM)40,667

Est. fan power (kW)7.4

Exhaust/supply points5

How to Use This Calculator

How the result changes with Clear height above fire (m)

System mode: 1=Smoke exhaust (atrium/mall), 2=Stairwell pressurization.
Design fire size (kW): Design fire heat release rate. 2,000 kW = typical retail/office sprinklered fire.
Clear height above fire (m): Height from top of fuel to bottom of desired smoke layer (smoke-free zone).
Atrium floor area (m²): Floor area of the atrium or large open space.
Ambient temperature (°C): Interior ambient air temperature.
Number of stairwells: Stairwells to pressurize (used in pressurization mode).

Exhaust/supply rate (CFM): Required mechanical exhaust rate (mode 1) or pressurization supply rate (mode 2).
Exhaust rate (m³/min): Volumetric flow in cubic meters per minute.
Smoke mass flow (kg/s): Mass production rate of the smoke plume (exhaust mode only).
Smoke layer temp (°C): Estimated smoke layer temperature (exhaust mode only).
Pressure differential (Pa): Design pressure difference for stairwell pressurization.
Makeup air (CFM): Makeup/replacement air needed to balance the exhaust.
Est. fan power (kW): Estimated fan motor power requirement.
Exhaust/supply points: Recommended number of exhaust or supply air injection points.

Identify Input Parameters
4 parameters
System mode = 1, Design fire size (kW) = 2000, Clear height above fire (m) = 6, Atrium floor area (m²) = 500 = 6 input(s) provided
Calculate Exhaust/supply rate
Exhaust/supply rate
40667 = 40667
Calculate Exhaust rate
Exhaust rate
1151.6 = 1151.6
Calculate Smoke mass flow
Smoke mass flow
18.26 = 18.26