for use in a suspended ceiling of the well known type utilizing inverted t - bar support framework , novel panels of this invention provide a pattern of parallel flutes extending the full length of the panel . panels fit between adjacent cross runners of a t - bar type suspension system , supported removably along two opposite sides in a manner which integrates the fluted panels and the downwardly exposed t - bar flanges into a uniform pattern substantially disguising the presence of the t - bars . associated trim members of a miniature beam style may be attached to t - bar main runners as a finish accent between ends of end - adjacent panels and , if desired , around the perimeter of the subceiling where they serve to conceal wall angles which provide support to panels at the perimeter . panels may be readily produced from flat sheet metal stock in a forming process and are easily installable and removable in the suspended subceiling framework .