Abstract: EGGOIST multi-level floor equipment system for commercial poultry maintenance combining the advantages of poultry's free-range run with periodical automated manure removal feature of the cage housing method. The optimum dimensions of the aviary body frame are calculated as per special formulae for the length and width depending on the nest type and arrangement. EGGOIST equipment system allows to improve the microclimate parameters of the aviary, to ensure the consistently high sanitary and hygienic conditions and the lowering of egg-laying hens' morbidity rate, and to dramatically increase production rates per farmland area unit.