Six Types of Venting Stacks: depending on the purpose they serve:
Soil Stack: Receives discharge from sinks, showers, tubs and toilets but never from urinals or water closets.
Waste Stack: Tie into clean water fixtures.
Vent Stacks: No liquid runs through the vent stack only air flow through the drain system.
Leaders: Rain water these extend horizontally. Storm drain or combined sewer drain to roof.
Branch drains: These lines branch off like a tree vertically to toilets sinks, dishwasher, washing machine etc. These lines carry waste to basement underground drain lines
Horizontal underground lines: are underground main lines that are under the slab usually in common areas and are slightly pitched cause they are gravity powered. These line carry waste to the city sewer. The horizontal lines that receive from waste and soil stacks run in building sewer line.
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