Filter module with independent securing means for an outlet grille, and for a filter element behind the grille

Claim 1

A housing for a clean room air filter of the type having a rigid peripheral frame carrying a sealing gasket at its upper end, said housing comprising: an upper housing portion having upper and lower ends, said upper end being adapted for connection to an air supply duct; a lower housing portion having upper and lower ends, said upper end of said lower housing portion being connected to said lower end of said upper housing portion, said lower housing portion being adapted to receive said filter; a bearing edge projecting downwardly from said lower end of said upper housing portion and within the confines of said lower housing portion for sealingly engaging said gasket; a lateral extension at said lower end of said lower housing portion extending outwardly around the entire periphery thereof; a plurality of retaining clips each releaseably connected to said laterial extension and having an end portion adapted to engage the lower end of said peripheral frame of said filter, said clips extending across only a fraction of the width of said peripheral frame; a grille having a peripheral frame; means releaseably connecting said peripheral frame of said grille to said lateral extension; and a second sealing gasket positioned on the upper surface of said peripheral frame of said grille and adapted, when said filter is secured within said lower housing portion and said grille is connected to said lateral extension, to sealingly engage both said upper surface of said peripheral frame of said grille and the lower surface of said peripheral frame of said filter including the portions thereof immediately adjacent said retaining clips.