The AAF AstroFan^TM FFU unit is a self-contained ceiling filter fan unit for use in turbulent mixing and laminar airflow cleanroom areas. The unit is designed for use with the AAF 50 and 55 mm T-Bar ceiling grid and the AstroDry HD ceiling grid, as well as other compatible grids. This unit can also be utilized in the AstroGel ND liquid seal ceiling grid. The unit is lightweight and easy to install.