Abstract: A ceramic fiber modular assembly for lining walls of furnaces is disclosed. The modular assembly comprises stacked strips of ceramic fibers and a refractory steel anchoring system. The anchoring system comprises two platelike lateral member which protrude parallel to the ceramic fiber strips with teeth projecting from both sides by the lateral members. One of the lateral member is rigidly fixed to a platelike central member and the other admits of translation relative thereto. An aperture in the central member permits securement to the wall of the furnace. During manufacture the modular assembly is partially wrapped in packaging material tied with straps, applying compression to the fibers. The packaging material is removed prior to installation of the modular assembly. When installed tight fitting contiguous modular assemblies exert compression on the fibers.