"通气管系统" can be translated as "ventilation pipe system" or "air vent system".
"Ventilation pipe system" emphasizes the function of ventilating or allowing air to flow through pipes.
"Air vent system" focuses more on the vents or openings that allow air to escape or enter.
Both are acceptable, and the choice may depend on the specific context or the emphasis you want to place on the system's function. In technical or engineering contexts, "ventilation pipe system" might be more commonly used.