How many fixture units does a chemical sink require?

A chemical sink is specialized plumbing equipment used mainly in laboratory settings for disposing of hazardous or corrosive substances safely. According to plumbing codes, fixture units are a way to quantify the probable demand of a plumbing fixture on the overall system.

When considering the requirements for a chemical sink, the correct value of 2 fixture units reflects the higher demand typically associated with such sinks compared to standard sinks. This is due to their specific design and use, which often involves a greater flow rate and the need for proper drainage to manage potentially hazardous materials effectively.

Other options indicate lower fixture unit values, which do not sufficiently account for the unique characteristics of a chemical sink’s usage and the necessary plumbing infrastructure to support it. Therefore, choosing 2 fixture units acknowledges the sink's increased drainage capacity and the type of materials handled.