What is the drainage fixture units assigned to an emergency floor drain?

The drainage fixture units assigned to an emergency floor drain is classified as zero. This designation reflects that emergency floor drains are typically not meant to handle continuous flow or regular drainage needs, but rather are designed to manage infrequent occurrences of water. Their role is primarily to prevent flooding and facilitate the safe drainage of unexpected water, such as from system failures.

The assignment of zero fixture units signifies that while the drain is necessary for safety and emergency situations, it does not contribute to the overall drainage load in the same way that other fixtures, like sinks or toilets, would. This makes it distinct from other plumbing fixtures that handle more routine waste and water flows. Emergency drains are not usually factored into the overall load calculations for a drainage system in a general sense, reinforcing why they receive a zero designation in drainage fixture units.