A plenum is a box or chamber in a ventilation or air conditioning...

9.2K views · 312 reactions | A greenhouse gas detector is one step closer to low Earth orbit! Designed and built by JPL as part of an effort led by the nonprofit Carbon Mapper, this imaging spectrometer instrument will help pinpoint and measure methane and CO2 sources from space. https://go.nasa.gov/3Zp2QlC | NASA Jet Propulsion Laboratory | Facebook