Pocket filter assembly

A pocket filter assembly for removing contaminations from an air or gas flow, comprising a frame structure having a number of filter pocket openings and a corresponding number of filter pockets, each filter pocket having a pocket mouth sealingly secured in a corresponding filter pocket opening, wherein the frame structure comprises an outer subframe and a corresponding inner subframe connected and locked to each other by means of locking elements at distributed locking positions along opening portions of the subframes defining the filter pocket openings, the outer subframe being hollow and the inner subframe being received within the hollow outer subframe;

• the filter pocket mouths are sealingly clamped between co-operating opening portions of the subframes, the clamped portions of the filter pocket mouths preferably extending gererally in the direction of air or gas flow through the corresponding filter pocket opening;
• and
• said locking elements, at each locking position on said co-operating opening portions of the subframes, comprise a projection on one of the subframes and a co-operating receiving aperture on the other of the subframes such that an interlock of the subframes to each other is obtained, while involving filter pocket mouth material of the associated filter pocket between said projection and said aperture such that said interlock is sealed thereby.