This drawing is the layout plan of the whole natural gas pipeline of a residential building, including the list of drawings, design instructions, legends and abbreviations, equipment and materials list, tower smoke exhaust system diagram, tower air conditioning water system diagram, tower ventilation and air conditioning system diagram, tower multi split air conditioning refrigerant pipe system diagram, ventilation and air conditioning plan, podium first floor ventilation and air conditioning combination plan Ordinary ventilation plan of civil air defense area