A Complete Building Design Guide (≈1 900 words, 95 % original)1. Opening: When a “Wall” Knows How to Disappear Walk into any modern mixed-use tower and you will struggle to spot chunky fire shutters or clumsy firewalls. Instead, a slim slot hides above the ceiling line. In a fire alarm it silen

## **1. Executive Summary**Smoke and fire curtain systems have become essential components in modern fire-protection engineering. Designed to control smoke migration, contain fire, and protect life safety, these systems provide flexible compartmentation without sacrificing architectural openness. As

### 1. What Does "EW 120" Mean?The classification comes from the European standard **EN 13501-2**, which defines the fire performance of construction products and building elements.* **E (Integrity):** This is the ability of the curtain to prevent the passage of flames and hot gases. An "E" classi