First, the product uses?? Alloy double Grille, widely used in air conditioning systems for the delivery outlet, according to requirements, the latter can be formulated aluminum outlet air flow control valve (miter gates), double Grille has two mutually vertical page piece adjustable horizontal and vertical page piece of angle, adjust the airflow spreads to change the range, the outlet of the frame width of the border there are two broad and narrow borders, can be used for the special requirements of the ventilation system. Second, the use?? This series of products are usually mounted on the side wall of the pipe or outlet for the side. Double Grille has two adjustable angle of the moving blades, short blades for regulating air flow diffusion angle can also be used to change the direction of the air flow; while adjusting the length of the blades can be attached to the ceiling so that air flow or pour a certain angle (when the fan heater) blade outer blade double or single Grille Grille can be parallel to the long side, can also be parallel to the short side, can be selected according to customer requirements. Third, the product features? A, double adjustable blade, get a different air diffusion distances and different angles? 2, can be used as outlet? 3, optional aluminum or iron production? 4, with valve with use