1993 - Shanghai Dehui Cleanroom & HVAC System Co.,Ltd was established
Since 2002, it has specified as Shanghai high-tech enterprise, and in the same year, it was appraised as excellent award of design innovation by Shanghai industry design promotion association
In 2003, the company passed SIO9001:2000 quality system certification, and has obtained dozens of technical patents, including direct evaporation air conditioning units.
In 2003, recognized as Shanghai high-tech achievements transformation project by Shanghai official department.
In 2006, was specified as the Shanghai key new products
In 2007, awarded as national key new product and Shanghai famous brand product
In 2011, Shanghai Tofflon Dehui was established as a subsidiary of Tofflon
In 2018, obtaining CE export certification for purification air conditioning equipment
1994 - Shanghai Dehui Purifying Air-conditioning Installation co.,ltd was established.
2011 - Shanghai Tofflon Dehui was established as a subsidiary of Tofflon.
In 2017, Tofflon Dehui was awarded the national level II qualification for professional contracting of Mechanical and Electrical Equipment Installation Engineering.
In 2018, won the third-level of general contracting of construction engineering and the second-level of professional contracting of Electronic and Intelligent Engineering.
Dehui has engaged in purification equipment and purification engineering business for many years, with nearly 20 years of industry experience, with its professional design and construction team and advanced production equipment and service concept, always in the leading position in the domestic purification industry.