This architectural drawing is a Section plan of a vent pipe in detail AutoCAD 2D drawing, CAD file, dwg file. When a toilet is flushed or a sink is emptied, vent pipes deliver fresh air to each plumbing fixture in the house, assisting the system in moving water through the drainage pipes. Plumbing air vents also keep sewage gases out of the house while allowing wastewater gas and stink to escape. For more details and information download the drawing file. Thank you for visiting our website cadbull.com.