The FeCrAl-type alloys containing 15-20 wt.% Cr, 4.5-5.5 wt.% Al and small amounts of reactive elements, most frequently yttrium or zirconium, are the best oxidation resistant metallic materials at high temperatures. Into this group are classified together alloys which differ considerably taking into account their detailed composition, content of impurities, and microstructure. This paper discusses briefly the similarities and differences between the oxidation behaviour of FeCrAl alloys with emphasis placed on the factors which may affect the rate of their degradation.