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The unique feature of the island vent is that it returns downward to a horizontal vent (foot vent) below the floor before rising vertically above the spill rim of the sink (see Figure 909.1b). Other than floor-mounted fixtures and island fixtures, no other fixture is permitted to have its vent installed below the floor.
In remodels, an A.A.V. may be used with island fixtures or remotely located sinks such as in bar, kitchen, or laundry tray locations. An A.A.V. may not be used in bathroom groups. In new construction, an A.A.V. may be used on island fixture sinks. Each A.A.V. may be used to vent only one (1) floor. Each A.A.V. must be readily accessible.
1 Μαρ 2020 · The intent of this bulletin is to clarify the use of special venting for island fixtures, commonly known as loop venting, to be used at other sink locations when structural framing conditions prohibit the standard plumbing vent system from being used.
The island fixture vent shall connect to the fixture drain as required for an individual or common vent. The vent shall rise vertically to above the drainage outlet of the fixture being vented before offsetting horizontally or vertically downward.
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Island sink venting shall be permitted for sinks and lavatories where the vent pipe cannot rise 6 inches above the flood level rim of the fixture before turning horizontal.
7 Μαΐ 2020 · An essential support and reference document for beginners and experts alike, the 2018 UPC and UMC Illustrated Training Manuals provide the entire code accompanied by hundreds of full-color photos and graphics and narrative discussion expanding on specific sections of each code.
