Holtop?Rectangular Circular Duct Type Electrical Heater 1. Widely used in ventilation system to heat the supply air. 2. Made of ceramic PLC heater, casing consists of steel sandwished with insulation glass wool. 3. Euquiped with control system, temperature can be set and adjust automatically, energy saving and comfortable. 4. Easy to install?and operate, free of maintenance. Holtop Factory Holtop is one of the best manufacturer in ERV/HRV, heat exchanger and AHU area in China, founded in 2002, areas covered more than 30,000 square meters, turnover of 2012 is 42 million dollars, we have enthalpy testing lab. for products test. As a leader in energy/heat recovery equipments, we cooperate with more than 30 famous companies who located in Europe, the Middle east, Korea, Southeast Asia, Taiwan, etc. supplied equipment to?Beijing Olympic and Shanghai Expo 2010, works together with domestic and international brands like Midea, Haier, Hitachi, etc. ?Certification System of Holtop Company For more information of?Rectangular Circular Duct Type Electrical Heater