What is the minimum pressure required at the top floor fixtures during demand in a facility?

The minimum pressure required at the top floor fixtures during demand in a facility is set at 15 psi. This level is crucial because it ensures that water can adequately flow to the highest points of the plumbing system, allowing fixtures to operate effectively.

Having at least 15 psi ensures that water delivery is consistent and that fixtures have enough pressure to provide necessary services, such as flushing toilets or using showers. Inadequate pressure could lead to insufficient water flow or complete loss of service at higher elevations, which would significantly impact the usability of plumbing fixtures. This standard is established in plumbing codes to guarantee safe and reliable water supply throughout all building levels, supporting both health and operational functionality.

The choices provided may represent various standards or preferences, but the specific requirement for minimum pressure during demand in many regulations aligns with 15 psi as a critical threshold for effective operational capacity.