Advantages of Dhanush uPVC windows. uPVC windows and doors are long lasting and deliver the same look and glaze for years without being affected even by worse physical factors. Dhanush uPVC windows and doors hardly require any maintenance. Unlike the timber and other materials, uPVC windows and doors need not to be painted regularly. Therefore, there maintenance is reduced to simple cleaning and does not involve any further expensive maintenance. uPVC doors and windows can be recycled and reused. The doors and windows offered by Dhanush Building Systems are Eco-friendly as they help in reducing deforestation by using uPVC as a smarter alternative for wood. The extrusive process of kommerling uPVC window and door profiles is relatively energy efficient, compared to other materials.