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Reaching satisfactory daylighting levels is an obligatory assignment in arid regions, which are normally described by year-long clear skies. Sun-breakers are normally utilized to control sun powered infiltration, accordingly enhancing illuminance circulation and diminishing visual uneasiness. This paper goes for characterizing the principle attributes of the slats that could be utilized to control solar access into office rooms of administrative building under clear-sky conditions. The study tended to office room plans with WWR 100% confronting south in Cairo, Egypt. The attention was on the effect of the slat position (whether indoor or outdoor) after research for the optimum inclination angle for each season of the year. The major objective was to guarantee sufficient Daylighting performance. Parametric recreation runs were performed utilizing Grasshopper, DIVA 4-for-Rhino. The results of this work distinguished the scope of slats as sun-breaker and their relation to enhance daylighting performance for the deep-office space. (C) 2018 The Authors. Published by Elsevier Ltd.