First, because the amount of overlapping fan frames is not appropriate; The zinc-steel guardrail can be adjusted by the outer hex screw under the lower bearing support, and the inner hex screw side inclined rod to achieve the purpose of correction.

Second, the displacement or position of the glass mat and the sash glass due to gravity deformation, the solution is based on the correct scientific method of reinstalling the gasket of the PVC guardrail. Sometimes some external damage is caused by window sash deformation, which should be avoided. Deformation due to re-installation of the installation, and strictly in accordance with the correct operating methods and standard specifications.

Third, the diagonal deviation of the box fan is too large, far exceeding the allowable deviation, which is mainly caused by cutting or welding. This artificial adjustment has little effect, and the cut PVC guardrail needs to be redone.

Fourth, the zinc steel guardrail is not up to the window, the most likely to use poor quality hardware doors and Windows.

Fifth, the zinc-steel guardrail mounting frame is installed at a tilt, which occurs when there is no verticality check under the line and walking window to avoid the impact of errors.