Abstract: A sealing system for a multi-panel T-bar ceiling. The panels are supported upon arms of the T-bar supports and a locking system is used for sealing the peripheral edges of the panels upon the arms of the T-bar. The sealing is in compressive relation of the panels upon the arms against upward forces that might tend to move the panels off the T-bar such as in cleaning operations and the like. The locking system is comprised of an operating rod, such as a screw or the like extending through the T-bar which can turn a threaded locking member, such as a clip or the like into forceful relation against the edge of the panel into sealing engagement against the arms of the T-bar. When sealed, only the head of the screw is visible from the bottom of the panel. A resilient seal may be employed between the panel and the arm of the T-bar.