42SG Type is Fan Coil; Stack Fan Coil
Carrier's model 42SG is a furred-in, stack series
fan coil unit designed for concealed applications in corners or
along room walls. They offer year-round comfort plus an extraordinary
degree of flexibility in design and installation for multi-story
buildings. The unit is available in 6 sizes: Nominal cfm of 300,
400, 600, 800, 1000, and 1200.