Home Building Facilities Sanitation Downpipe with parallel ventilation Downpipe with parallel ventilation Description Save Black water downspout in building ductwork; with parallel ventilation in pvc. Format DWG File size 54.02 KB DOWNLOAD DWG share your appreciation Related Posts Sanitary Grease Trap leachate pit Sanitary details bathroom detail Construction details plumbing. Cross drain construction detail laundry pool carcamo Drain siphon detail drain siphon Details of bathrooms and kitchens Latrine and water tank for agriculture Bathroom finishes and details Gutter details Grease Trap Tank Detail Structure and facilities Pool bottom drain sanitary slab Drain and bathroom trap storm drain detail manhole detail