--  The special balance device is adopted, which makes the operation stable and reliable .
      --  SFJHc drawer type screen frame design, easy to complete screen replacement.
      --  The screen boat is driven by a belt, which is simple, reliable and easy to maintain .
      --  The rear support adopts Rosta elastic support, good flexibility, not easy to break, long life, more stable operation.
      --  The screen body can realize the suspension type and the landing supporting type, and the installation is convenient .