pvc window with grills/plastic upvc profile for doors/sliding upvc new window profileProduct Description The windows and doors are important part of one house , we use them to ventilate the air of house and bring in the sunlight . A good window or door should have some performances like sunlight shading , sound insulation , break resistance , to protect the your house and make home more comfortable. To increase the performance of windows and doors , you may try some methods below , Sunlight Shading 1,use window and door shading system