Bubbler mat with separate box type mat elements

A bubbler mat having at least one box-like element connectable to an air supply, said mat element being formed of a pair of opposing part shells (1, 2, 21, 22, 31, 32) having surfaces abuttable along a connection plane (40), said part shells having complementary grooves for forming at least one air-supply canal (3, 4) connectable to the air supply and lying along said connection plane when said shells are brought into abutment, said abutting surfaces of said mat elements being so formed as to provide a plurality of air discharge openings (11, 12) lying along said connection plane, said air discharge openings being connected to said air supply canal and opening on the exterior of said part shells for producing streams of air on said exterior.