![]() This vent terminates above the roof.Ī vent through roof (VTR) is any vent that extends through the roof to allow escape of sewer gases and to equalize pressures in the drainage system to prevent siphonage from trap seals. The main vent should be so located as to provide a complete loop for circulation of air through the wastewater-removal system.Īs an alternative to direct extension through the roof, a vent stack may be connected with a stack vent, if the connection is made at least 6 in above the floodlevel rim of the highest fixture.Ī stack vent is the extension of a soil or waste stack above the highest horizontal drain connected to the stack. It should extend undiminished in size and as directly as possible from outdoor air at a level at least 6 in above the roof to the building drain. ![]() It supplies air to branch vents, which, in turn, convey it to individual vents and wastewater pipes.Įvery building should have at least one main vent stack. The main vent is the principal artery of the venting system. The availability of air prevents back pressure and protects traps against siphonage. Waste pipes are vented to the outside to balance the air pressure in various branches and to dilute any gases present. Properties of Structural Steels and Effects of Steelmaking and Fabrication.Site surveys, investigations and layout.Contract conditions used for civil engineering work. ![]()
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