3” 7.07 sq. in. TABLE 7-5 MAX. UNIT LOADING AND MAX. LENGTH OF VENT PIPING 4” 12.56 sq. in. SIZE OF PIPE 1 ¼ 1 ½ 2 3* 4 (inches) Maximum DFUs Drainage Piping Vertical 1 2 16 48 256 Horizontal 1 1 8 35 216 Vent Piping Horizontal and Vertical 1 ½ inches Maximum DFUs 1 8 24 84 256 2 inches Maximum Lengths (feet) 45 60 120 212 300 3 inches Questions 10-14 are to correctly size the 4 inches above double bath system diagram. no additional venting needed Vertical height 18 feet – The total DFU load for this system is: 3.0 11.0 14.0 17.0 22.0 The following pipe sizes are referenced in the UPC but are generally not Minimum size building sewer is: commercially available for purchase: 1 ½ inch 1 ¼ inch pipe size 2 inch 2 ½ inch pipe size 3 inch 3 ½ inch pipe size 4 inch all of the answers provided 6 inch none of the answers provided Minimum size for vent A is: A pipe diameter is increased from 2 to 3 1 ¼ inches inches. This would mean that the 1 ½ inches increase would be ______ larger. 2 inches 1 pipe size 3 inches 1 ½ pipe sizes 4 inches 2 pipe sizes 2 ½ pipe sizes Minimum size for vent B is: 3 pipe sizes 1 ¼ inches 1 ½ inches A building drain of 4 inches is installed 2 inches that has 4 fixtures with 2-inch diameter 3 inches vents (VTR) at each fixture. Does this 4 inches meet code requirements? (Choose the best answer) Minimum size for vent C is: Yes because 2 vents at 2 inches is 4 – 1 ¼ inches inches. 1 ½ inches Yes because 4 vents at 2 inches has a – 2 inches cross section greater than a 4-inch 3 inches drain. 4 inches Yes all 4 fixtures will probably not be – used at the same time. A vent of _____ diameter is needed to No because Sanitary Tees used for – bring this installation into code vent fittings were not inverted. compliance.
3” 7.07 sq. in. 4” 12.56 sq. in. TABLE 7-5 MAX. UNIT LOADING AND MAX. LENGTH OF VENT PIPING SIZE OF PIPE (inches) 1 ¼ 1 ½ 2 3* 4 Maximum DFUs Drainage Piping Vertical Horizontal 1 1 2 1 16 8 48 35 256 216 Vent Piping Horizontal and Vertical Maximum DFUs Maximum Lengths (feet) 1 45 8 60 24 120 84 212 256 300 Questions 10-14 are to correctly size the above double bath system diagram. Vertical height – 18 feet The total DFU load for this system is: 3.0 11.0 14.0 17.0 22.0 Minimum size building sewer is: 1 ½ inch 2 inch 3 inch 4 inch 6 inch Minimum size for vent A is: 1 ¼ inches 1 ½ inches 2 inches 3 inches 4 inches Minimum size for vent B is: 1 ¼ inches 1 ½ inches 2 inches 3 inches 4 inches Minimum size for vent C is: 1 ¼ inches 1 ½ inches 2 inches 3 inches 4 inches A vent of _____ diameter is needed to bring this installation into code compliance. 1 ½ inches 2 inches 3 inches 4 inches no additional venting needed The following pipe sizes are referenced in the UPC but are generally not commercially available for purchase: 1 ¼ inch pipe size 2 ½ inch pipe size 3 ½ inch pipe size all of the answers provided none of the answers provided A pipe diameter is increased from 2 to 3 inches. This would mean that the increase would be ______ larger. 1 pipe size 1 ½ pipe sizes 2 pipe sizes 2 ½ pipe sizes 3 pipe sizes A building drain of 4 inches is installed that has 4 fixtures with 2-inch diameter vents (VTR) at each fixture. Does this meet code requirements? (Choose the best answer) Yes – because 2 vents at 2 inches is 4 inches. Yes – because 4 vents at 2 inches has a cross section greater than a 4-inch drain. Yes – all 4 fixtures will probably not be used at the same time. No – because Sanitary Tees used for vent fittings were not inverted.
2009%20UPC%20Chapter%209%20Vents%20Questions.docx