In public buildings, restrooms typically combine natural air intake with mechanical exhaust. However, older student dormitories in universities often suffer from poor ventilation, leading to environmental pollution issues. This chapter addresses odor problems in dormitory restrooms by examining: the necessity and design of partitions, including whether they should extend to the ceiling; and the effectiveness of multidirectional low-power exhaust systems. Using a Chinese university dormitory as a case study, CFD simulations were conducted focusing on H2S and NH3 as target pollutants. Solutions analyzed include extending partitions to the ceiling and implementing multidirectional exhaust systems. The goal is to improve ventilation in old dormitory restrooms at a relatively low cost and energy consumption. This research aims to provide practical solutions for enhancing air quality in existing dormitory facilities.