Abstract: A cordierite ceramic filter structure of the type having a plurality of clean gas channels forming outlets at the one end thereof, a plurality inlet channels forming inlets on said side surfaces for gas to be filtered, and thin porous sections separating said inlet channels from the outlet channels for removing particulate from the gas to be filtered, wherein the filter structure includes a plurality of stacked filter elements with each of the elements comprising a pair of marginal serrated side portions and a plurality of ribs intermediate the marginal side portions with thin porous sections joining and extending therebetween wherein the marginal sections have a substantially uniform width of greater than about 1 inch which are interrupted by a vertically extending notch adjacent for mounting said filter structure to a housing.

Abstract: A multi-pass ceramic recuperator includes a temperature compensator mounted within the gaseous flow of an intermediate pass. The compensator includes a bleed valve actuated by a temperature sensitive mechanism which is mounted outside the compensator body and directly in the gaseous flow.

Abstract: A heat recuperator comprises a cross-flow ceramic core within a housing. The housing includes an inlet conduit and an outlet conduit for a gas to be heated. The housing also includes means for thrice passing said gas through the ceramic core in order to improve the diffusion of the gas through the core.