Since the vertical louvers outlet: a one-way vent, when the wind comes out automatically opens out exhaust, no wind it will automatically turn off so it automatically shut off the indoor and outdoor ventilation. Other air do not have this feature. Since hanging Grille Product Overview 1, since the vertical Grille for positive pressure room auto exhaust, the exhaust pipe to the outlet and the ventilation shaft of the outlet and the like. Normally vent louvers by weight and natural droop, isolated indoor and outdoor air exchange, air installation from the vertical blinds, when the indoor air pressure is greater than the outside air pressure, sunshine from hanging Grille, air and blowing out the exhaust louvers, and vice versa When indoor air pressure is less than to outdoor air pressure, air flow can not reverse flow into the room, the air one-way check effect. Zhongwei from hanging Grille, Yanda air conditioning, since the vertical Grille company by Wu County Yanda air-conditioning plant. Zhongwei from hanging Grille, Yanda air conditioning, since the vertical Grille is Wu County Yanda air-conditioning plant (www.wcydkt.com) (www.wcydkt.com) this year introduced a new upgrade, the above picture is only for reference, please call the contact phone book page or image on to obtain the latest information, contact: Wu Yusong.