Secondary explosions tend to cause the most damage in an unprotected system, rather than the first explosion. This tends to be due to insufficient explosion isolation in the ducting between vessels or connecting plant equipment in plant at risk. Often , weak enclosures such as dust collectors, cyclones, bins , silos and bucket elevators are only protected with explosion venting, and while this may relieve some over-pressure or decouple the explosion somewhat , however there is still a greater risk of further damage if explosion isolation measures are not implemented to prevent the propagation of explosions between vessels. The explosion will not selectively travel only through the explosion vent opening. The explosion will enter through all the available openings. If the explosion enters connecting ducting and is allowed to travel to connected equipment , the hazard becomes very dangerous. The plant equipment can be protected by the use of explosion isolation products.