NM³/hr stands for Normal Cubic Meters per Hour. It is a unit of volumetric flow rate used to measure the flow of gases, often in the context of industrial processes, HVAC systems, or gas handling systems.

"Nm³/hr" stands for "Normal Cubic Meters per Hour". It's a unit of measurement used to express the volumetric flow rate of a gas, typically at standard temperature and pressure (STP).

• Normal refers to the conditions of 0°C and 1 atmosphere (101.325 kPa).
• Cubic Meters is the unit of volume.
• Hour is the unit of time.

Therefore, Nm³/hr represents the amount of gas (in cubic meters) that flows through a particular point in one hour, under standard conditions.

This unit is commonly used in industries like oil and gas, chemical processing, and environmental monitoring.