How to choose doors and windows: 1. The appearance should be beautiful: the paint film on the surface of wooden doors and windows should be smooth and bright, without quality defects such as sagging, bubbles, wrinkles, corrosion spots, dead joints, broken joints; the wood used for door and window covers should be the same as the wood and color of the door and window sash. coordination. The color difference between the veneer and the wood line should not be large, and the tree species should be the same. 2. The doors and windows should be square, not warped and deformed, and consistent with the door and window frame: if there is a large gap between the door and window and the frame, it is mainly because the planing is not allowed during installation or the door and window frame is not perpendicular to the ground, the door and window can be removed and repaired; If the door or window frame is not vertical, the gasket should be aligned with the frame plate. 3. The hinge should be positioned accurately and installed firmly: if the hinge is not correct, it will cause the door and window fan and the frame sleeve to be inconsistent, and the door and window will not open and close smoothly. You can first unscrew a screw from each hinge, then adjust the coincidence of the door and window sash and the frame, and then tighten all the screws after the adjustment is correct. If the hinge screw is short, or the screw is not screwed in when the screw is screwed in, or the screw is tilted, it will cause the door and window sash to float left and right. The appropriate screws should be replaced and the screws should be straight. Screw in 1/3 first, and then screw in the rest. 4. The opening and locking of the door lock should be smooth, and the two parts locked on the door leaf and the door frame should be coordinated: improper locking will cause the door leaf to open and close freely. Before installation, remove the bolt plate, repair the tongue and groove with a chisel, and adjust the bolt opening of the door frame. In addition, the opening direction of the door should also meet the requirements. 5. The door and window cover must have a base material: when the window cover is blockboard or MDF, first fix the base plate on the base keel of the window frame, and then nail the line: the door and window cover should be made of a wooden frame, planed and straightened, and then Assembled and mounted on the wall, then covered with base plate and veneer. Tap the side panel of the door and window casing with your hand. If there is an empty drum sound, it means that there is no basic board such as blockboard on the bottom layer, and it needs to be removed and redone. When buying doors and windows, not only should they look beautiful, but also whether the edges and corners are square, whether the basic materials are firm, etc. from different angles. Installation will only come handy if you have everything covered at the time of purchase.