Saifian Aircon

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Louver is a ventilation product that allows air to pass through it, while keeping out unwanted elements such as water, dust and debris. A fixed blade mounted inside the frame allows this function. The basic parameters for selecting louvers are Free Area, Water Penetration and Pressure Loss (Resistance to Airflow). Obstruction is essential in order to keep undesirable water out. A fully obstructed opening allows no water in. While a totally unobstructed opening allows water to enter unimpeded. A perfectly designed louver maximizes the free area. 

Gravity Shutters 
Gravity shutters are commonly employed in intake and exhaust applications in residential, commercial and industrial ventilating system. They are used in maintaining assured pressure in pressure prone dwellings, where the blades automatically open to discharge the excessive air. Gravity shutters are commonly known as pressure relief dampers and non return dampers designed to prevent backflow and to equalize the pressure across the system.