Clean room ceiling construction

A suspension ceiling for clean rooms, comprising:

• a suspended ceiling support structure having a plurality of grid openings including a vertical member between each said grid opening and flanges extending horizontally from each said vertical member so as to form a horizontal surface around a periphery of each said grid opening for peripherally supporting a ceiling insert in said grid opening;
• at least one ceiling panel positioned in a said grid opening and peripherally supported by said flanges, said ceiling panel including opposite front and back horizontal surfaces facing down and up, respectively, and a generally vertical continuous edge surface between said horizontal panel surfaces around the periphery of said panel;
• an edge cap sealingly engaging said ceiling panel edge surface for inhibiting particle emission therefrom, said cap comprising an elongated rigid or semis-rigid strip of generally U-shaped cross-section having first and second horizontal portions respectively compressively engaging the periphery of said back and front ceiling panel horizontal surfaces, and a vertical portion joining said first and second horizontal strip portions adjacent said ceiling panel edge surface;
• and
• a gasket secured on said second horizontal portion of said edge cap compressed against said horizontal flange surface to form a seal between said edge cap and said flange around the periphery of said grid opening, said gasket comprising a plurality of elongated ridges deformed into an overlapping configuration by said compression.