一、材料方面
1. Material aspects
为增强全金属构造的屋顶风机的抗腐蚀性能，可以运用整机热镀锌，同样能够运用铝合金来做防雨帽。为了处理好全玻璃钢构造的屋顶风机的老化问题，一般运用增大玻璃钢厚度的方法来强化处理，此肯定会提高生产成本，所以全玻璃钢构造的屋顶风机的物料成本要比全金属构造的屋顶风机高，依照测算，就结构成本2者就差了30%差不多;有效的办法为屋顶风机使用钢-玻璃钢的复合构造，防雨帽和逆止阀部分运用的是玻璃钢制作而成。完全将玻璃钢的耐锈能力优，并且易于造型的特征发挥出来，能按照气流组织与美学要求制作成各类不同功能的屋顶风机，让风机阻力变得少，外观形态更美观;风筒与基础零件运用钢构造且通过热镀锌方式进行处理，此能确保此构造的强度与防腐的要求，某些连接配件直接焊接到风筒上，让生产工艺简易化。
In order to enhance the corrosion resistance of the roof blower with all metal structure, the whole machine can be galvanized, and aluminum alloy can also be used as a rain helmet. In order to deal with the aging problem of the roof blower in the whole glass steel structure, the method of increasing the thickness of the glass steel is generally used to strengthen the treatment. This will certainly increase the production cost, so the material cost of the whole glass steel structure roof fan is higher than that of the whole metal structure roof fan. According to calculation, the cost of the structure of the 2 is less than 3. 0% almost. The most effective way is to use steel FRP composite structure for roof fans. The rain cap and check valve parts are made of FRP. The features of the FRP are excellent, and the features are easy to be made. They can be made into various functional roofing fans according to the air flow organization and aesthetic requirements, making the fan resistance at least and the appearance more beautiful; the wind and basic parts are made of steel and treated by hot galvanizing. This can be true. To ensure the strength and corrosion resistance of the structure, some connection accessories are directly welded to the wind tube to simplify the production process.
二、余压方面
Two, residual pressure aspect
在确保屋顶风机有额定的风量前提之下，需确保大于50Pa的余压提供给用户运用。
Under the premise of ensuring the rated air volume of the roof blower, it is necessary to ensure that the residual pressure greater than 50Pa is provided to the users.
三、止逆和方面
Three, inverses and safety aspects
屋顶风机都设置了在机器停止运作时可以关闭的逆止装置。能够配装活页风门，活页风门存在重力式、电动式及手动式这三类，能依照工程要求来进行选用。在设计中，如果所运用的屋顶风机无逆止性的时候，测算采暖热负荷的时候需充分思考一下屋里热空气的损失和屋外冷空气的侵入所导致的部分热量的散失。在严寒区域，还需思考其对值班采暖的干扰。在风机下面需配设坚实、牢固及可靠的网来保证。
The roof blower is equipped with a backstop which can be safely shut down when the machine is stopped. It can be equipped with loose leaf throttle, and there are three kinds of loose door throttle, gravity, electric and manual, which can be selected according to engineering requirements. In the design, when the roof fan is used in the design, it is necessary to think about the loss of hot air in the house and the partial heat loss caused by the intrusion of cold air outside the roof when calculating the heating load. In severe cold areas, it is also necessary to consider its interference with duty heating. A solid, solid and reliable safety net should be provided below the fan to ensure safety.
四、防结露方面
Four. Prevention of dew
在设计屋顶风机的时候，需尽大可能减少屋里外空气一起接触部分的面积，降低结露量。在工程设计中，考虑到因素，屋顶风机的配装位置需尽可能避开工艺装备与工作岗位的正上方，降低滴水对生产的干扰。
When designing the roof blower, it is necessary to minimize the area of the air contact part outside the house and reduce the dew amount. In engineering design, taking into account the safety factors, the position of the roof fan should be avoided to the top of the equipment and job as far as possible to reduce the interference of the dripping water to the production.
五、防强风方面
Five. To prevent strong wind
在台风和强风频发的地方，需选择使用拥有良好的抗台风性能的屋顶风机，它的需尽量保持低一点，可使用流线型的构造来降低风阻，伞形的防雨帽的抗风性能非常不理想，好不要使用此构造。强风来临归于非正常状况，防雨帽的设计能够依照停机情况来进行考虑。在台风和强风频发的地方所运用的屋顶风机还能考虑额外配装自动副翼，尽管在刮特大风的天气状况下，因配装了自动副翼会降低风及雨的大量涌入。副翼会经过弹簧恢复原位，并且副翼还可以起着减少空气阻力的流片的功用，实现增强风量的效果。
In places where typhoons and strong winds occur frequently, it is necessary to choose a roof fan with good anti typhoon performance. Its center of gravity needs to be kept as low as possible, and streamline structure can be used to reduce wind resistance. The anti wind performance of umbrella shaped rain cap is very undesirable. It is best not to use this structure. The advent of strong winds is due to abnormal conditions. The design of rainproof caps can be considered in the light of downtime. The roof blower used in typhoons and strong winds can also consider additional automatic ailerons, although in the windy weather conditions, the installation of an automatic aileron will reduce the influx of wind and rain. The aileron will be restored to the original position through the spring, and the aileron can also play the function of reducing the air resistance of the flow sheet to enhance the air volume.
六、噪声方面
Six. The noise aspect
屋顶风机需拥有良好的声学指标，为了把控噪声，风机的转动速度不能大于1500r/min，以运用960r/min的风机为好。小于5000m3/h的屋顶风机的噪声需把控在50dB之下，高于5000m3/h的噪声需把控60dB以下，且需要防止产生高频噪音的问题。
Roof fans should have good acoustic indicators. In order to control noise, the speed of fan can not be greater than 1500r/min, and 960r/min fan is the best. The noise of the roof fan less than 5000m3/h needs to be controlled under the 50dB. The noise above the 5000m3/h needs to be controlled below the 60dB, and the problem of high frequency noise needs to be prevented.
七、运作维护方面
Seven. Operation and maintenance
屋顶风机不适合设置需人工进行清理工作的空气过滤器，若送风存在清洁度的要求，需运用另外的一些空气处理方案。
The roof fan is not suitable for setting up the air filter which needs to be cleaned manually. If the air supply has the requirement of cleanliness, some other air treatment schemes should be used.
