A hot gas filtration system comprising - a filter vessel, - a tubesheet separating the interior of the filter vessel into a clean gas section and a raw gas section, said filter vessel comprising at its raw gas section a raw gas inlet and at its clean gas section a clean gas outlet, - a plurality of filter elements (24; 25) having a raw gas portion and a clean gas end, said plurality of filter elements being arranged in two or more groups of two or more filter elements, said filter elements (24; 25) being connected to the tubesheet with their clean gas ends and extending with their raw gas portions into the raw gas section of the interior of said vessel, - two or more plenum chambers (36; 38) accommodated in the clean gas section of the interior of the filter vessel, each plenum chamber (36; 38) accommodating the clean gas ends of the filter elements (24; 25) of one group of filter elements, each of said plenum chambers (36; 38) comprising a gas exchange opening (44; 46) providing a direct fluid communication of its interior with the clean gas section of the interior of the filter vessel, - a blowback arrangement comprising a blowback gas reservoir and a blowback gas pipe (54; 56) for each group of filter elements, said blowback gas pipes (54; 56) having an outlet positioned in said clean gas section of the vessel, said outlet (62; 64) of the blowback gas pipes (54; 56) being directed at the gas exchange opening (44; 46) of the plenum chambers (36; 38), characterized in that said outlet (62; 64) of said blowback pipe (54; 56) having a free cross-sectional area of from about 15 % to about 50 % of the free cross-sectional area of said gas exchange opening (44; 46) of said plenum chambers (36;38), and in that said outlet (62; 64) of said blowback gas pipe (54; 56) is positioned about flush with the upper end of the gas exchange opening (44; 46) of said plenum chambers (36; 38). - a filter vessel, - a tubesheet separating the interior of the filter vessel into a clean gas section and a raw gas section, said filter vessel comprising at its raw gas section a raw gas inlet and at its clean gas section a clean gas outlet, - a plurality of filter elements (24; 25) having a raw gas portion and a clean gas end, said plurality of filter elements being arranged in two or more groups of two or more filter elements, said filter elements (24; 25) being connected to the tubesheet with their clean gas ends and extending with their raw gas portions into the raw gas section of the interior of said vessel, - two or more plenum chambers (36; 38) accommodated in the clean gas section of the interior of the filter vessel, each plenum chamber (36; 38) accommodating the clean gas ends of the filter elements (24; 25) of one group of filter elements, each of said plenum chambers (36; 38) comprising a gas exchange opening (44; 46) providing a direct fluid communication of its interior with the clean gas section of the interior of the filter vessel, - a blowback arrangement comprising a blowback gas reservoir and a blowback gas pipe (54; 56) for each group of filter elements, said blowback gas pipes (54; 56) having an outlet positioned in said clean gas section of the vessel, said outlet (62; 64) of the blowback gas pipes (54; 56) being directed at the gas exchange opening (44; 46) of the plenum chambers (36; 38),