🏛️ NFPA 92 (Axisymmetric Fire Plume Smoke Exhaust CFM, Anti-Plugholing Inlets)

NFPA 92 Atrium Smoke Exhaust Calculator

Model fire plume smoke layer dynamics and emergency smoke exhaust airflow for large open atriums and covered shopping malls under NFPA 92: calculate axisymmetric plume mass flow rate (keeping smoke layer strictly > 6.0 ft above highest egress balcony), calculate critical exhaust velocity to prevent plugholing (fresh air short-circuiting), and life safety profits.

1. Project & Operating Inputs

Atrium Ceiling Clear Height (Feet e.g. 65.0 ft Multi-Story Atrium)

Design Fire Convective Heat Output (kW e.g. 2,500 kW Transient Fire)

Customer Bid Price for Supplied & Integrated Smoke Exhaust Fans ($)

High-Temp Roof Exhausters (400°F / 2-Hr), Make-Up Louvers, Controls ($)

2. Financial Breakdown & Yield

NFPA 92 ATRIUM SMOKE MANAGEMENT

Turnkey Atrium Smoke System Profit

Engineered Smoke Control Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost