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绝大多数厂商制造符合编码图的风机。外形的改变是为合理化服务的。离心风机的叶轮按绝对相同的尺寸制造,使得结构系列之间的更换不成问题。在屋顶通风器方面,水平排气的结构占优势。有一种垂直排气的屋顶通风器,其空气射流的射程可达5米,是较新的。具有这种结构特点的设备被设备安装人员越来越多地用于排放具有强烈气味的排气工程。展出的过滤器的滤材只有塑料纤维。给出的过滤效率(按美国ASHRAE-标准52-68)是用本公司试验台测出的。卷绕式过滤器越来越被袖袋式过滤器取
Most manufacturers manufacture wind turbines that conform to code maps. The change in shape is to rationalize the service. The impeller of the centrifugal fan is manufactured in exactly the same size, so that the replacement between the structural series is not a problem. In terms of roof ventilators, the horizontal exhaust structure dominates. There is a vertically vented roof ventilator with an air jet range of up to 5 meters and is relatively new. Devices with this structural feature are increasingly being used by equipment installers to discharge exhaust gases that have a strong odor. The filter material on display was only plastic fiber. The filtration efficiency given (according to US ASHRAE-standard 52-68) was measured using our test bench. Winding filters are increasingly being taken by sleeve filter