Four corn cob particleboard samples were used. They were displayedon the floor of the emitting room as Fig. 2 shows and
according to the recommendations of the NP EN ISO 140-7 [26]. A minimum distance of 0.5 m between the samples and the border of the floor, and a 45 angle between alignments of the samples and the reinforced concrete structural elements (e.g. beams) were guaranteed.