Abstract: A light-weight thick-walled unitary burner block adapted to embrace a burner installed in the wall of a high temperature furnace. The block is formed of spun refractory fibers accreted by vacuum deposition from an aqueous slurry.

Abstract: The invention comprises an assembleable mantelpiece, which includes a mantel, a pair of side members, and means for positioning and securing the mantel and pair of side members relative to each other and relative to a fireplace, so as to enable the mantelpiece to be manufactured, shipped and stored disassembled, and assembled and installed relative to a fireplace conveniently and efficiently, without subjecting the mantelpiece to possible damage resulting previously from installation thereof, and without requiring finishing necessary previously as a consequence of such installation thereof.

Abstract: A prefabricated metal throat, for a chimney, is assembled by simple interengagement of two identical elements of a first type with two identical elements of a second type to provide a principal body shaped as a truncated regular pyramid with a rectangular base. The elements of the first type have C-sections in planes parallel to the bases, and each forms a terminal face and two return angles of the throat. The elements of the second type join the return angles together for forming front and rear faces of the throat. The elements are cast in iron, and the second type are trapeziums in which the oblique sides are inclined to the base at an angle according to the size of the chimney, so that the horizontal parts of the C-sections do not exceed a length limit compatible with core-less moulding of the cast iron.

Abstract: An insulated metal chimney lining, having constant loading spring suspension from the chimney column, is provided at the lower portion of a brick chimney lining to form the breeching entry. To provide additional thermal expansion capacity, an expansion joint may be incorporated in the metal liner.

Abstract: To form a seal between a roof and a pipe projecting through this roof, it is known to construct roof flashing structures having a flat plate which has a centralized opening and an upstanding tapered housing attached to the flat plate and extending around said opening. Such roof flashing structures can be improved by providing the top of the housing with an annular sealing ring seat which has an external wall formed as an extension of the housing wall, an interior wall, parallel to the exterior wall, and a top wall connecting the exterior and interior walls. These three walls define a channel within the housing. The channel opens in a downward direction toward the plate and a rib on a sealing ring fits into this channel and seats the sealing ring into the sealing ring seat.

Abstract: A chimney for purifying smoke or gases has a tubular lining within the chimney on which a cleaning liquid downwardly flows. A central helicoidal surface composed of a plurality of piled helical elements, imparts a helical movement to smoke or gases rising through the chimney, whereby impurities impinge on the film of liquid and are washed down. The lining can consist of a plurality of single or double walled tubular elements piled end-to-end and possibly arranged to supply the liquid in cascade.