Quartet Thermal Engineering Pvt. Ltd. Offers Heat Treatment Shaker Hearth Plants. Quartet Thermal Engineering Pvt. Ltd. Manufactures different types of Heat Treatment Plants and Furnaces. The Heat Treatment Shaker Hearth Plants are made available in precision engineered finish and find application for all heating as well as heat-treatment processes in foundries, annealing plants, forges and other hot-forming operations. In case of discontinuous operation combined with suitable furnace layout, these can also be frequently used for different heat-treatment processes as well as for different types of material.