Special Joinery

Smoke and heat evacuators and US doors

The approach used for civil doors and windows is the same that we use for the construction of doors and windows that are bound by fire regulations. We are able to offer various types of vertical EFCs with different types of drive and doors for emergency exit use certified according to UNI EN 14351 in certification class 1, always maintaining the approach of architectural comparison with the designers

Anti-blast technology

Anti-Blast technology is not just ballistic security technology.

What do engineers face when designing a structure that must conform to a set of deflaration resistance specifications? To simplify things we could say that, when a bomb explodes in real life, a pressure wave is created that rapidly expands into the surrounding atmosphere. The wave moves from the site of the explosion until it hits an object from which it is reflected, giving rise to what is called reflex overpressure. If the object is a glass panel, the overpressure – as shown in the figure – immediately begins to decrease. What follows is a negative load phase that occurs as soon as the vacuum created at the site of the explosion is quickly filled by the surrounding atmosphere. It is at this stage that, in addition to the tendency of the glass to undergo a rebound effect, it can occur the leaking and the fall of the same outside towards the source of the explosion.

While a wind load in a normal project in Italy could be 800 Nm-2, the values for overpressure, defined in the EN rules governing anti-blast technology, range from 50,000 to 2,800,000 Nm-2 – loads that in practice could never be tolerated if applied statically.

Plastic films and anti-foundation glass are therefore only surrogates that, if not inserted into a well-designed frame, do not solve the problem.

The joinery must be designed both to contain the pressure wave resulting from the flare-up, and the immediate following wave of depression.

In severe conditions the mechanics of the joinery are literally unhinged, turning the door and the frame itself into real bullets.

The wave of depression is all the more devious and dangerous as it comes at a time when the joinery has already suffered the violence of the explosion and is therefore already damaged.

If not well designed, the parts of the window, after the pressure wave, are hurled outwards, creating additional danger to the environment subjected to the explosion.

The EM969 srl experience.

The EM969 S.r.l.’s decades-long experience in blast-resistant safety is a internationally appreciated guarantee of seriousness and quality of service.

The EM969 srl since 2005 is the reference company for NATO and for the US-Navy in the supply of blast-resistant fixtures on Italian and European territory.