\"As the simple, natural-inflow-based chimney structure has been overlooked, indoor ventilation has come to rely solely on mechanical fans, resulting in widespread discomfort and deteriorating air quality in many households.\"

Ventilation problems have long been blamed on kitchen hoods, but the real issue lies in the chimney structure. This study experimentally proves that lower chimney openings enable natural air inflow, restoring a long-forgotten structure that enhances indoor air circulation. This dataset marks the first step toward correcting the structural misunderstanding prevalent in modern residential buildings.