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2. Air gap (plumbing) - Wikipedia

   en.wikipedia.org/wiki/Air_gap_(plumbing)

   According to the International Residential Code 2003, an air gap length must meet the requirements of being two times the effective inner diameter of the pipe (2×D) in order to be sufficient. [2] A standard widely use in the United States is: A112.1.2 Air Gaps in Plumbing Systems (For Plumbing Fixtures and Water-Connected Receptors)

3. Clearance (civil engineering) - Wikipedia

   en.wikipedia.org/wiki/Clearance_(civil_engineering)

   In South Africa and the southern region of Africa, the minimum vertical clearance of modern bridges is 5 metres (16 ft 5 in), although the legal height limit of road vehicles is still at 4.3 metres (14 ft 1 in). [7] United Kingdoms has a standard on minimum clearance of a public highway at 16 feet 6 inches (5.03 m).

4. List of countries by access to improved sanitation facilities

   en.wikipedia.org/wiki/List_of_countries_by...

   The Joint Monitoring Programme for Water Supply and Sanitation of WHO and UNICEF has defined improved sanitation as follows: flush toilet, [4] connection to a piped sewer system, connection to a septic system, flush/pour-flush to a pit latrine, ventilated improved pit (VIP) latrine, pit latrine with slab, composting toilet and/or some special ...

5. Low-flow fixtures - Wikipedia

   en.wikipedia.org/wiki/Low-flow_fixtures

   The energy policy EPAct 1992 for residential buildings, restricted toilets to a maximum of 1.6 gpf (Gallons per flush). Kitchen and bathroom faucets were limited to a flow rate of 2.2 gpm (gallons per minute) at 60 psi, and residential shower heads were limited to a flowrate of 2.5 gpm at 80 psi.

6. Residential water use in the U.S. and Canada - Wikipedia

   en.wikipedia.org/wiki/Residential_water_use_in...

   Future reduction in toilet end use will occur as more homes use low-flush toilets (1.6 gpf, or 6 lpf) mandated by the 1992 Energy Policy Act, or high efficiency toilets (1.28 gpf or 4.85 lpf) which meet the EPA WaterSense specifications. A recent study shows that about 21 percent of all toilets in 5 states (Arizona, California, Colorado ...

7. Accessible toilet - Wikipedia

   en.wikipedia.org/wiki/Accessible_toilet

   According to ADA the height of toilet bowl shall be 17 inches (430 mm) at a minimum when measured from the floor to the top of the toilet seat. Flush controls shall be hand operated or automatic mounted on the wide side of the toilet area and easily reached and operated.