1, when decorating, because tear open window process to be able to destroy system of wall of room inside and outside, had better change first door window, reentry goes next decorate. Should owner choose the profile of which kind of brands clearly? The character of profile will decide the class of whole door window, the problem such as sealing and ageing, the person that buy a house does not want by becloud of place of fuzzy concept of ” of window of door of steel of cheap model of price of the “ in the market.

2, when the choose and buy, must go to normal building materials market, roadside small vendor's stand its treatment facilities is pallet, precision and intensity cannot assure at all. Especially window of model steel door, the quality of steel of liner of window of model steel door that they do is inferior, do not have line steel even, other fittings are very poor also.

3, the surface color of window of model steel door should be pale color. Color passes white or hair is grey, explain its material is qualitative the stable component inside is insufficient, easy ageing of with the passing of time becomes yellow.

4, check hardware agile, smooth.

5, bottom of push-pull window window frame is due aluminous slippery course, convenient its change.

6, the fluid sealant that makes the same score a window should can change freely, because sealing strip compares the life of window body,want short.

7, the sealed wool of push-pull window, casement among due stator, this is the key of stand or fall of push-pull window sealing

8, in installing a process, what should control the horizontal way of door window and perpendicular direction is corrective. Window frame and wall apply epispastic glue to have stuff between body, and side of window frame inside and outside must use silicon copper gum or fluid sealant undertakes sealed, avoid ooze water. After installation ends, must uncover diaphragm, can reduce the service life of door window otherwise