Abstract: A filter-collector apparatus comprising a closed vessel having in inlet for introducing pneumatically conveyed material thereinto and an outlet for discharging material therefrom, a detachable tube sheet disposed in the vessel and cooperating with the vessel to provide a material collector chamber and a plenum chamber, wedging means for detachably securing the tube sheet to the vessel, at least one filter tube extending through an opening in the tube sheet and into the collector chamber, having the interior thereof communicating with the plenum chamber, wedging means for detachably securing the filter tube to the tube sheet, means disposed in the plenum chamber for selectively injecting a stream of fluid under pressure into the filter tube for dislodging filtered material deposited on the filter tube, means for detachably securing the fluid injecting means to the tube sheet and the vessel having outlet means communicating with the plenum chamber.