What characteristics describe the legacy MEP units?

The characteristics of legacy MEP (Mechanical, Electrical, and Plumbing) units are best described by their reliance on primarily mechanical or electromechanical parts. This is due to the fact that legacy systems were developed during times when technology was more limited and less reliant on advanced electronics.

These MEP units typically consist of components that work mechanically or utilize basic electrical operations, as opposed to the more modern integration of digital technology found in newer systems. Mechanical systems are characterized by their use of physical parts like gears, fans, and pumps, whereas electromechanical systems combine both electrical inputs and mechanical outputs but do not feature the sophisticated electronic controls and networking capabilities of contemporary systems.

When contrasting this with the other choices, remote monitoring capabilities and the use of electronic service tools are characteristics more associated with newer MEP units, which have adopted advancements in technology for better efficiency and ease of use. The incorporation of sound absorbent technology is also a more recent enhancement aimed at reducing noise pollution in HVAC systems and is not a characteristic typically found in legacy units.