Corridor Smoke Purge Explained: Extract High, Supply Low | UAE Code and NFPA 92

What keeps a corridor usable when there is a fire on one floor of the building? In most fires the danger is the smoke. This video explains the corridor smoke purge system one step at a time: what it is for, how it works, and how it is sized. In this video: Why we extract high and bring make-up air in low, and keep make-up below the exhaust Corridor volume: full height from floor to slab soffit, not to the false ceiling Air change rate: 6 per hour minimum in the UAE code; NFPA 92 sets no corridor rate Make-up air: at least 85 % of the extract (UAE), 85 to 95 % (NFPA 92) Damper leakage from the other floors Grille rules: 15 m spacing, extract high, 6 m from exits, make-up air below 5 m/s Fans rated 400 °C for 2 hours, emergency power, motorised smoke dampers, automatic start within 30 seconds References: UAE Fire and Life Safety Code 2018 (Chapter 10) and NFPA 92. Requirements differ by country and project; always confirm them with your local authority. Run the calculation yourself in MEP Automate - Smoke Management Calculations: https://www.mepautomate.com Chapters 0:00 Welcome 0:35 What it is for 1:23 How it works 2:04 Quick question: which height? 2:26 Design criteria 3:18 Where the grilles go 4:13 Fans, power and dampers 4:57 How it starts 5:15 The tool 6:11 Close Presented by Hussein Ragab - Chartered Engineer (CEng), Member CIBSE, ASHRAE member, Certified Fire Protection Specialist (CFPS). One MEP concept at a time. More videos coming on the principles and on how to use each tool - subscribe so you do not miss them. Built by engineers, for engineers. #SmokeControl #CorridorSmokeExtract #FireLifeSafety