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Holtop is the leading manufacturer of air to air heat and energy recovery ventilation equipment in China. The manufacturing base and headquarter are located in Beijing, holding more than 500 employees and the areas covered more than 70,000 square meters. The annual production capacity is about 200,000 units. Holtop builds a sound certificate system of ISO9001, ISO14001 and OHSAS18001 as well as product certification systems. Moreover, it has a laboratory certified by national authority. As a well-known man
