A radiant burner for treating an effluent gas stream from a manufacturing processing tool, comprising: a plurality of treatment chambers, a separating structure (50B, 50B') separating a pair of adjacent treatment chambers tapering in a direction of flow of said portion of said effluent stream, said separating structure at least partially defining each adjacent pair of treatment chambers, wherein said separating structure comprises a pair of foraminous walls (130A, 130B) through which treatment materials pass for introduction into both said adjacent pair of treatment chambers, and either a) an electrical energy device coupled with each separating structure, operable to provide electrical energy to heat the separating structure which heats the treatment materials as they pass through the separating structure into the treatment chamber; or b) the treatment materials are fuel gas and air which are simultaneously supplied to the foraminous walls to affect flameless combustion at the exit surface wherein said separating structure comprises a treatment material inlet for supplying said treatment materials into a void defined by said separating structure, each foraminous wall at least partially defining one of said adjacent pair of treatment chambers and comprises a curved foraminous connecting portion (130A, 130B) connecting said pair of foraminous walls along an edge, said plurality of treatment chambers are arranged as a row of treatment chambers and each separating structure is located between each adjacent pair of treatment chambers within said row; each treatment chamber having an effluent stream inlet for supplying a respective portion of said effluent gas stream to that treatment chamber for treatment therewithin. a plurality of treatment chambers, a separating structure (50B, 50B') separating a pair of adjacent treatment chambers tapering in a direction of flow of said portion of said effluent stream, said separating structure at least partially defining each adjacent pair of treatment chambers, wherein said separating structure comprises a pair of foraminous walls (130A, 130B) through which treatment materials pass for introduction into both said adjacent pair of treatment chambers, and either a) an electrical energy device coupled with each separating structure, operable to provide electrical energy to heat the separating structure which heats the treatment materials as they pass through the separating structure into the treatment chamber; or b) the treatment materials are fuel gas and air which are simultaneously supplied to the foraminous walls to affect flameless combustion at the exit surface a) an electrical energy device coupled with each separating structure, operable to provide electrical energy to heat the separating structure which heats the treatment materials as they pass through the separating structure into the treatment chamber; or b) the treatment materials are fuel gas and air which are simultaneously supplied to the foraminous walls to affect flameless combustion at the exit surface wherein said separating structure comprises a treatment material inlet for supplying said treatment materials into a void defined by said separating structure, each foraminous wall at least partially defining one of said adjacent pair of treatment chambers and comprises a curved foraminous connecting portion (130A, 130B) connecting said pair of foraminous walls along an edge, said plurality of treatment chambers are arranged as a row of treatment chambers and each separating structure is located between each adjacent pair of treatment chambers within said row; each treatment chamber having an effluent stream inlet for supplying a respective portion of said effluent gas stream to that treatment chamber for treatment therewithin.