The AstroFan FFU module comprises of an aluminium housing (2,0 mm) containing a high performance encapsulated AAF Optimized direct driven backward curved EC fan/motor combination and a replaceable AAF HEPA or ULPA filter. The entire housing is easy to decontaminate and resistant to disinfectants. The housing seals and rests on the anodized aluminium extrusions of the AAF HEPA or ULPA filter. The 14 mm flat flange of the filter rests on the dry gasket, applied into the ceiling grid.