3, open the shutter blades and the frame was installed in the form of self-hanging Grille, facilitate mounting and supporting the use of the filter when the indoor air pressure greater than outdoor air pressure, air will blow open outward exhaust louvers. Since the vertical louvers air Features | Yanda air conditioning (certified) | Handan from vertical Grille by Wu County Yanda air-conditioning plant. Wu County Yanda air-conditioning plant (www.wcydkt.com) (www.wcydkt.com) Shandong Dezhou, heat, refrigeration and air conditioning equipment leader, over the years, the company is implementing the scientific management, innovation and development, honesty and trustworthiness policy, and satisfy customer needs. In Yanda air conditioning leadership with the staff warmly welcome all inquiries negotiations to create Yanda air conditioning better future.