Air handling system including shroud and grille, and method of use

摘要

An air handling system adapted especially for drop ceiling gridwork employs a shroud and a grille. The grille is made of a material meeting UL Standard 94 or 181 and rests on the drop ceiling gridwork. The shroud is made of a material meeting at least UL Standard 94HB, and at least its inner surface is non-reflective to hide the shroud structure when viewed through openings in the grille. The shroud interconnects the grille openings to an air handling duct above the gridwork using the appropriate fasteners.