Here FCU insulation details including roof slab , supply air , threaded anchor GI threaded rod ,GI washer and lock nut , neoprene vibration rod horizontal chassis above a ceiling void, horizontal exposed, underfloor and vertical wall mounted units.(FCU) is a device that uses a coil and a fan to heat or cool a room without connecting to ductwork. Indoor air moves over the coil, which heats or cools the air before pushing it back out into the room more details of FCU insulation details download this file.