HomePUC Window Filter is a dust and insect stopping, pollution (odour) absorbing air filter for home windows. Its properties are more advanced than a surgeons mask including a nano coated bactericide. It does not use any power and can be installed on any type of a window using hook & loop (Velcro TM) technology.
The standard HomePUC Window Filter retails at under $8 (Rs. 400) and typically covers one side of an open window.