1, look at the window surface: window frame to be clean, smooth, smooth, no scratches, bumps, no cracks at the junction;
2, see hardware: hardware to be complete, the location should be correct, the installation of strong, flexible use;
3, see the glass seal: seal and glass contact should be smooth, not curling,
4, to see the sealing quality: doors and windows closed, there is no obvious gap between the fan and the box, the seal should be in a compressed state;
5, look at the glass: glass should be smooth, strong installation, there should be no loose phenomenon, double glass inside and outside the surface shall not have dust and water vapor, the compartment can not tilt;
6, to see the pressure: the pressure must be completely close to the glass, and the joints at the joints should be less than or equal to 1 mm;
7, see the fight material: fight Tang material should be tightly connected with the window frame with a caulking paste sealed, not loose;
8, see the switch components: half open, pull up or rotating windows should be closed tight;
9, frame and wall connection: window frame should be horizontal and vertical, consistent, the box and the wall should be connected firmly;
10, to see the drainage hole: the location of the drainage hole to be correct, but also smooth.