【Daily Question】Utilities - Water Supply and Drainage - 20200223

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Which of the following statements regarding the venting pipes of appliances is incorrect? (   )   A. The fixture vent was formerly known as a “small ventilation duct”. B. In buildings where noise control is a priority, it is advisable to install fixture vents in the domestic drainage pipes. C. On the horizontal drainage branches connected to multiple sanitary fixtures, the section of the vent that runs from the downstream end of the first fixture to the main venting shaft or auxiliary venting shaft is referred to as a fixture vent. D. Fixture vents are generally installed in the bathrooms of buildings where high standards for hygiene and noise reduction are required. Answer: C. The description in option A is accurate; options B and D comply with the provisions of Article 4.6.4 of the current “Code for Design of Building Water Supply and Drainage Systems”. According to Articles 2.1.51 and 2.1.51 of the current Code for Design of Building Water Supply and Drainage, option C describes the definition of a circular vent pipe; the vent pipe for sanitary fixtures should be the section that connects the outlet end of the fixture’s trap to the main vent pipe. Therefore, C is the correct answer.