HVAC Radiator Steel Panel Radiator are typical products in the steel panel radiator industry. The most advanced features are including sophisticated technology, excellent performance, compact structure, unique conduction, high efficiency, elegant appearance. Its the most popular model in Europe now. HH-22 radiator adopt three panels and three convectors, can be fitted in Type A(inlet and outlet on the right or left side) or Type B(both inlet and outlet in the bottom) connection.