Vented suppressive shielding

In a ventilated, porous structure for an explodable device, a shielding barrier having a frame means carrying at least two barrier means in selected positions relative to one another, said shielding barrier having oppositely facing surface members and one of said surface members being disposed to face the explodable device with the other surface member facing away from the explodable device,

• a first one of said barrier means being located adjacent said one of said surface members and a second one of said barrier means being disposed adjacent said other surface member,
• said first one of said barrier means being free to move in a space defined by said frame means and relative to said frame means,
• wherein said first one of said barrier means comprises louver means,
• wherein said louver means includes a first array of louver members all extending substantially in the same plane and a second array of louver members all extending substantially in another plane spaced from said same plane,
• wherein said louver means includes a subframe movably carried in said frame means, said subframe comprising a pair of spaced plate members with one end of each of said louver members fixed to one of said plate members and the opposite end of each of said louver members being fixed to the other of said plate members.