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The rectangular fabric expansion joints consisted of two carbon and stainless steel frames separated by a high-temperature Silica fabric. The frames measured 13” × 37” × 6”, 14½” × 20½” × 6” and 17¼” × 17¼” × 4” and weighed 90, 115, and 170 lb. Each expansion joint was designed for a 15” Water Column (W.C.) with a temperature of 750°F and allowed for movement ranging from ±½” to ±1” in both the axial and lateral directions.