Automatic exhaust fan uses: 
 Generate air convection, the row of cooling gas. 
 Reduce air conditioning load, increase the indoor fresh air. 
 Out the roof moisture, Meiqi,, steam to keep the roof dry. 
 Instead of heavy-duty electric exhaust fan to reduce the cost of stents to save electricity, and subtract the noise. 
 Specifications: 300,360,400,450,500,600,680,800,880 and other models profiled ventilation control wind can help you solve these problems 
 The Liaocheng sun Stainless Steel Co., Ltd. specializing in the production of free power - roof ventilation products, with more than 20 sets of large and medium-sized stamping equipment. With ventilators researchers, more than 160 product models, 200, 300, 400, 500, 600, 680, 800, 880, and all kinds of special-shaped ventilation, has a professional installer. Welcome customers counterparts at home and abroad visit the guide.