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(B) DEFINITION OF TERMS. AIR GAP. AN AIR GAP IN A WATER SUPPLY SYSTEM IS THE UNOBSTRUCTED VERTICAL DISTANCE THROUGH THE FREE ATMOSPHERE BETWEEN THE LOWEST OPENING FROM ANY PIPE OR FAUCET SUPPLYING WATER TO A TANK, PLUMBING FIXTURE, OR OTHER DEVICE AND THE FLOOD-LEVEL RIM OF THE RECEPTACLE. ANCHORS. SEE SUPPORTS. APPROVED. APPROVED MEANS ACCEPTED OR ACCEPTABLE UNDER AN APPLICABLE SPECIFICATION STATED OR CITED IN THIS CODE, OR ACCEPTED AS SUITABLE FOR THE PROPOSED USE UNDER PROCEDURES AND POWERS BY THE PLUMBING BOARD. AREA DRAIN. AN AREA DRAIN IS A RECEPTACLE DESIGNED TO COLLECT SURFACE OR RAIN WATER FROM AN OPEN AREA. BACKFLOW. BACKFLOW IS THE FLOW OF WATER OR OTHER LIQUIDS, MIXTURES, OR SUBSTANCES INTO THE DISTRIBUTING PIPES OF A POTABLE SUPPLY OF WATER FROM ANY SOURCE OR SOURCES OTHER THAN ITS INTENDED SOURCE. (SEE BACK-SIPHONAGE.) BACKFLOW CONNECTION. BACKFLOW CONNECTION OR CONDITION IS ANY ARRANGEMENT WHEREBY BACKFLOW CAN OCCUR. BACKFLOW PREVENTER. A BACKFLOW PREVENTER IS A DEVICE OR MEANS TO PREVENT BACKFLOW INTO THE POTABLE WATER SYSTEM. BACK-SIPHONAGE. BACK-SIPHONAGE IS THE FLOWING BACK OF USED, CONTAMINATED, OR POLLUTED WATER FROM A PLUMBING FIXTURE OR VESSEL INTO A WATER SUPPLY PIPE DUE TO A NEGATIVE PRESSURE IN SUCH PIPE. SEE BACKFLOW. BATTERY OF FIXTURES. A "BATTERY OF FIXTURES" IS ANY GROUP OF TWO OR MORE SIMILAR ADJACENT FIXTURES WHICH DISCHARGE INTO A COMMON HORIZONTAL WASTE OR SOIL BRANCH. BOILER BLOW-OFF. A BOILER BLOW-OFF IS AN OUTLET ON A BOILER TO PERMIT EMPTYING OR DISCHARGE OF SEDIMENT. BRANCH. A BRANCH IS ANY PART OF THE PIPING SYSTEM OTHER THAN A MAIN, RISER OR STACK. BRANCH, HORIZONTAL. SEE HORIZONTAL BRANCH. BRANCH FIXTURE. SEE FIXTURE BRANCH. BRANCH INTERVAL. A BRANCH INTERVAL IS A LENGTH OF SOIL OR WASTE STACK CORRESPONDING IN GENERAL TO A STORY HEIGHT, TO PREVENT CIRCULATION OF AIR BETWEEN THE DRAINAGE SYSTEM OF THE BUILDING AND THE BUILDING SEWER. CIRCUIT VENT. A CIRCUIT VENT IS A BRANCH VENT THAT SERVES TWO OR MORE TRAPS AND EXTENDS FROM IN FRONT OF THE LAST FIXTURE CONNECTION OF A HORIZONTAL BRANCH TO THE VENT STACK. CODE. THE WORD "CODE" WHEN USED ALONE SHALL MEAN THESE REGULATIONS, SUBSEQUENT AMENDMENTS THERETO, OR ANY EMERGENCY RULE OR REGULATION WHICH THE PLUMBING BOARD HAVING JURISDICTION MAY LAWFULLY ADOPT. COMBINATION FIXTURE. A COMBINATION FIXTURE IS A FIXTURE COMBINING ONE SINK AND TRAY OR A TWO-OR-THREE COMPARTMENT SINK OR TRAY IN ONE UNIT. COMBINED BUILDING SEWER. A COMBINED BUILDING SEWER RECEIVES STORM WATER AND SEWAGE. COMBINATION WASTE AND VENT SYSTEM. A COMBINATION WASTE AND VENT SYSTEM IS A SPECIALLY DESIGNED SYSTEM OF WASTE PIPING EMBODYING THE HORIZONTAL WET VENTING OF ONE OR MORE SINKS OR FLOOR DRAINS BY MEANS OF A COMMON WASTE AND VENT PIPE ADEQUATELY SIZED TO PROVIDE FREE MOVEMENT OF AIR ABOVE THE FLOW LINE OF THE DRAIN. COMMON VENT. A COMMON VENT IS A VENT CONNECTING AT THE JUNCTION OF THE FIXTURE DRAINS AND SERVING AS A VENT FOR BOTH FIXTURES. CONDUCTOR. SEE LEADER. CONTINUOUS VENT. A CONTINUOUS VENT IS A VERTICAL VENT THAT IS A CONTINUATION OF THE DRAIN TO WHICH IT CONNECTS. CONTINUOUS WASTE. A CONTINUOUS WASTE IS A DRAIN FROM TWO OR THREE FIXTURES CONNECTED TO A SINGLE TRAP. CONTRACTING FIRM. A CONTRACTING FIRM IS ANY INDIVIDUAL, PARTNERSHIP OR CORPORATION ENGAGED IN THE BUSINESS OF CONTRACTING FOR THE PERFORMANCE OF PLUMBING WORK. CONTRACTOR. SEE CONTRACTING FIRM. CROSS CONNECTION. A CROSS CONNECTION IS ANY PHYSICAL CONNECTION OR ARRANGEMENT BETWEEN THE OTHERWISE SEPARATE PIPING SYSTEMS, ONE OF WHICH CONTAINS POTABLE WATER AND THE OTHER WATER OF UNKNOWN OR QUESTIONABLE SAFETY WHEREBY WATER MAY FLOW FROM ONE SYSTEM TO THE OTHER, THE DIRECTION OF THE FLOW DEPENDING BUT IN NO CASE LESS THAN 8 FEET WITHIN HORIZONAL BRANCHES FROM ONE FLOOR OR STORY OF A BUILDING ARE CONNECTED TO THE STACK. BRANCH VENT. A BRANCH VENT IS A VENT CONNECTING ONE OR MORE INDIVIDUAL VENTS WITH A VENT STACK IR STACK VENT. BUILDING. A BUILDING IS A STRUCTURE BUILT, ERECTED, AND FRAMED OF COMPONENT STRUCTURAL PARTS DESIGNED FOR THE HOUSING, SHELTER, ENCLOSURE OR SUPPORT OF PERSONS, ANIMALS, OR PROPERTY OF ANY KIND. BUILDING CLASSIFICATION. BUILDING CLASSIFICATION IS THE ARRANGEMENT ADOPTED BY THE BUILDING OFFICIAL FOR THE DESIGNATION OF BUILDINGS IN CLASSES BASED UPON THEIR USE OR OCCUPANCY. BUILDING DRAIN. THE BUILDING (HOUSE) DRAIN IS THAT PART OF THE LOWEST PIPING OF A DRAINAGE SYSTEM WHICH RECEIVES THE DISCHARGE FROM SOIL, WASTE, AND OTHER DRAINAGE PIPES INSIDE THE WALLS OF THE BUILDING AND CONVEYS IT TO THE BUILDING (HOUSE) SEWER BEGINNING THREE (3) FEET OUTSIDE THE BUILDING WALL. BUILDING SEWER. THE BUILDING (HOUSE) SEWER IS THAT PART OF THE HORIZONTAL PIPING OF A DRAINAGE SYSTEM WHICH EXTENDS FROM THE END OF THE BUILDING DRAIN AND CONVEYS IT TO A PUBLIC SEWER, PRIVATE SEWER, INDIVIDUAL SEWAGE DISPOSAL SYSTEM, OR OTHER POINT OF DISPOSAL. BUILDING STORM DRAIN. A BUILDING (HOUSE) STORM DRAIN IS A BUILDING DRAIN USED FOR CONVEYING RAIN WATER, SURFACE WATER, GROUND WATER, SUBSURFACE WATER, CONDENSATE WATER, COOLING WATER, OR OTHER SIMILAR DISCHARGE TO A BUILDING STORM SEWER OR A COMBINED BUILDING SEWER, BEGINNING THREE (3) FEET OUTSIDE THE BUILDING WALL. BUILDING STORM SEWER. A BUILDING (HOUSE) STORM SEWER IS THE EXTENSION FROM THE BUILDING STORM DRAIN TO THE PUBLIC STORM SEWER, COMBINED SEWER, OR OTHER POINT OF DISPOSAL. BUILDING SUBDRAIN. A BUILDING (HOUSE) SUBDRAIN IS THAT PORTION OF A DRAINAGE SYSTEM WHICH CANNOT DRAIN BY GRAVITY INTO THE BUILDING SEWER. BUILDING TRAP. A BUILDING (HOUSE) TRAP IS A DEVICE, FITTING, OR ASSEMBLY OF FITTINGS INSTALLED IN THE BUILDING DRAIN. FIXTURE BRANCH. A FIXTURE BRANCH IS A PIPE CONNECTING SEVERAL FIXTURES. FIXTURE DRAIN. A FIXTURE DRAIN IS THE DRAIN FROM THE TRAP OF A FIXTURE TO THE JUNCTION OF THAT DRAIN WITH ANY OTHER DRAIN PIPE. FIXTURE SUPPLY. A FIXTURE SUPPLY IS A WATER-SUPPLY PIPE CONNECTING THE FIXTURE WITH THE FIXTURE BRANCH. FIXTURE UNIT. A FIXTURE UNIT IS A QUANTITY IN TERMS OF WHICH THE LOAD PRODUCING EFFECTS ON THE PLUMBING SYSTEM OF DIFFERENT KINDS OF PLUMBING FIXTURES ARE EXPRESSED ON SOME ARBITRARILY CHOSEN SCALE. FIXTURE UNIT FLOW RATE. FIXTURE UNIT FLOW RATE IS THE TOTAL DISCHARGE FLOW IN GPM OF A SINGLE FIXTURE DIVIDED BY 7.5 WHICH PROVIDES THE FLOW RATE OF THAT PARTICULAR PLUMBING FIXTURE AS A UNIT OF FLOW. FIXTURES ARE RATED IN MULTIPLES OF THIS UNIT OF FLOW. FLOOD LEVEL RIM. SEE FLOODED. FLOOD LEVEL RIM. THE FLOOD LEVEL RIM IS THE TOP EDGE OF THE RECEPTACLE FROM WHICH WATER OVERFLOWS. FLOODED. A FIXTURE IS FLOODED WHEN THE LIQUID THEREIN RISES TO THE FLOOD LEVEL RIM. FLUSH VALVES. A FLUSH VALVE IS A DEVICE LOCATED AT THE BOTTOM OF THE TANK FOR THE PURPOSE OF FLUSHING WATER CLOSETS AND SIMILAR FIXTURES. FLUSHOMETER VALVE. A FLUSHOMETER VALVE IS A DEVICE WHICH DISCHARGES A PREDETERMINED QUANTITY OF WATER TO FIXTURES FOR FLUSHING PURPOSES AND IS ACTUATED BY DIRECT WATER PRESSURE. FROSTPROOF CLOSET. A FROSTPROOF CLOSET IS A HOPPER THAT HAS NO WATER IN THE BOWL AND HAS THE TRAP AND THE CONTROL VALVE FOR ITS WATER SUPPLY INSTALLED BELOW THE FROST LINE. GRADE. GRADE IS THE SLOPE OR FALL OF A LINE OF PIPE IN REFERENCE TO A HORIZONTAL PLANE. IN DRAINAGE IT IS USUALLY EXPRESSED AS THE FALL IN A FRACTION OF AN INCH PER FOOT LENGTH OF PIPE. GREASE INTERCEPTOR. SEE INTERCEPTOR. GREASE TRAP. SEE INTERCEPTOR.