The objective of this research was to evaluate the influence of Mangeldorf germinator (Biomatic) and the incubator for B.O.D. in the accelerated aging test (gerbox method), performed in soybean, peanut and rice seeds. The evaluation was made based on monitoring the germinators temperature and relative humity variation; relative humity inside the gerbox; the moisture content and the seed germination (before and after aging). The conditions for this test were: 42°C, 100% R.H. and time periods for soybean (48h); peanut (48h) and rice (144h) in the accelerated aging chamber. The Biomatic germinator showed high temperature variation during the test, condensation of steam water under the lid of the gerbox and water dripping on the seeds, that increased the seed moisture content, which showed more drastic results than the aged seeds in the BOD. There was no significative difference between the germinators on the soybean seed germination, however, the aged peanut and rice seeds in the Biomatic germinator presented higher deterioration. The BOD incubator showed to be more adequate for the accelerated aging test when compared with the Mangeldorf type, due to the fact that presenting temperature uniformity and not causing a condensation of steam water under the lid of the gerbox.