FFU means a fan + filter unit (fan filter unit), and a laminar flow hood is one that can be formed purification equipment vertical unidirectional flow, structurally speaking, laminar flow hood is a rack-mounted, FFU are lifting; laminar flow hood It can be seen as an evolution of FFU, flexible installation, easy filter replacement, etc., and a laminar flow hood to increase the average flow plate to improve the uniformity of the wind, but also to protect the filter to a certain extent, more beautiful appearance. Return air location is different, FFU are shed Dingding return air from the ceiling, and a laminar flow hood is the return air from the room. And the installation site is structurally different, but the principles are the same, are air purification equipment. Laminar flow hood but no FFU wide range of applications.