The NBC filtration train, why overpressure matters, what manual backup means, and how to read a ventilation quote.
Technical ReferenceSix interdependent systems — shell, blast door, NBC filtration, power, water, and communications. A complete technical reference.
TechnicalThe 7-10 rule explained, three shelter duration scenarios, and what the 14-day Swiss specification standard requires.
EngineeringWhy the Swiss survival minimum is not a habitability standard, and what a livable shelter actually requires.
Eight due-diligence questions for any purchase decision — from Protection Factor to commissioning documentation.
EvaluatingWhat each delivers, where each falls short, and how to decide which is right for your site and scenario.
TechnicalHonest performance assessment across six threat scenarios. Tornado: yes. NBC: no. Radiation: it depends.
TechnicalThe sealing problem explained — and three questions to verify any NBC claim from a supplier.
TechnicalWhy containers are designed for vertical corner-post loads, and what happens to their walls and roof underground.
What is driving global demand for private protective construction — and what serious buyers are actually specifying.
Programme Overview114% coverage, 360,000 structures. What the Swiss programme requires, how it's enforced, and why TWK 2017 is the global benchmark.