一、气密性：

1. Air tightness:

1、每个长度的直管是采用一整片金属卷制而成，可达到最好高的气密性；

1, each length of straight pipe is made of a whole piece of metal coil, which can achieve the best high air tightness.

2、螺旋风管安装时，管与管的连接口较少。典型的圆风管长度是4-6米，而矩形风管长度只有1-1.5米。允许的情况下，圆风管可以更长。

2. When the spiral air duct is installed, there is less connection between the pipe and the pipe. The typical circular duct length is 4-6 meters, while the rectangular duct length is only 1-1.5 meters. When allowed, the pipe can be longer.

3、连接两个风管只需要一个接头，而矩形风管则需要两个完全分离的法兰系统连接。

3, only one connection is needed to connect the two ducts, and two separate pipes are connected to the rectangular duct.

二、耗材：

Two. Consumables:

1、在相同截面积情况下，矩形风管的周长比圆形风管长13%，长宽比1︰2的矩形风管的周长就多出圆风管的20%，1︰3多出30%，1︰4的则多出41%；因此圆形风管的制作板材以及安装时所用的密封胶和保温材料都要比矩形风管少。

1. Under the same sectional area, the circumference of the rectangular wind pipe is 13%, the length of the rectangular wind pipe with the length and width ratio 1 to 2 is 20%, 1: more than 3, 30%, and 1 to 4 more 41%. Therefore, the plate and the insulation material used in the round wind pipe are less than the rectangular wind pipe.

2、同样保温效果，与矩形风管相比，圆形风管可以用更薄的保温材料。也可使用较低密度的保温层。

2, the same insulation effect, compared with rectangular duct, circular air duct can use thinner insulation material. It is also possible to use a lower density insulation layer.

3、安装吊托架的数量和尺寸都可减少。矩形风管吊托架的距离为2.5M而圆形风管是3M。

3, the number and size of the mounting bracket can be reduced. The distance from the rectangular duct bracket is 2.5M while the circular duct is 3M.

4、圆形风管优越的结构特点完全允许在相同情况下使用更薄的板材加工。

4. The superior structural characteristics of the circular duct allow for the processing of thinner plates under the same circumstances.