Why does a plumbing fixture trap need a water seal?
Correct Answer
C) To block sewer gas from the occupied space
Retained water forms a barrier between the drainage system and indoor air while allowing wastewater to pass. Loss of that seal can admit sewer gases. Heating water, carrying fixture weight and reducing duct noise are different functions. Source: https://www.iccsafe.org/building-safety-journal/bsj-technical/an-overview-of-plumbing-trap-requirements-under-the-international-plumbing-code/
Why This Is the Correct Answer
Retained water forms a barrier between the drainage system and indoor air while allowing wastewater to pass. Loss of that seal can admit sewer gases. Heating water, carrying fixture weight and reducing duct noise are different functions. Source: https://www.iccsafe.org/building-safety-journal/bsj-technical/an-overview-of-plumbing-trap-requirements-under-the-international-plumbing-code/
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On the supplied schematic practice drawing (S-737), what is the sum of the three printed chain dimensions? Use the dimension labels rather than scaling the sloping graphic.
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On the supplied schematic practice drawing (A-772), what is the sum of the three printed vertical segment dimensions? This exercise tests reading dimensions, not a code-required assembly size.