soil vent [′sȯil ‚vent]
(engineering)
stack vent
stack vent, 1
1. The extension (to the open air) of a soil or waste stack above the highest horizontal branch drain or fixture branch connected to the stack. Also called a soil vent or waste vent.
2. In built-up roofing systems, a vertical outlet permitting water vapor, which is entrapped within the insulation, to escape.
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