Referring to the Baidu encyclopedia of ducts, it is concluded that the installation time of a round duct system is only 1/3 of that of a similar rectangular duct.
Often, only a small installation space is required. Without any increase in pressure drop, a 200mm diameter circular duct can replace a 250 x 150mm rectangular duct in the same installation space.
Several parallel circular pipes can replace flat rectangular pipes without adding any additional installation space. All factors are considered, in the vast majority of cases.
Circular piping takes up less space than rectangular piping. For the same pressure characteristics, the installation space for several round pipes is often the same or less than that of a rectangular pipe. Many rectangular piping systems require a 4-bolt system for installation, which adds 40 to 80mm in all directions of the pipe.
Expanded:
Short for magnesium chlorooxygenated ventilating duct, can also be called modified inorganic FRP ventilating duct) is a new generation of environmentally friendly and energy-saving duct that replaces the tin duct and fiberglass duct. Whether in the production, production, installation, or in the process of plant decoration and use, do not produce harmful substances to the environment, do not rust, do not mold, do not accumulate dust.
No glass fiber duct dust and fiber, no odor; low thermal conductivity, excellent thermal insulation performance; good sound insulation, sound absorption performance, no noise generated by the contraction and expansion of the tin duct. It has the characteristics of non-combustible, folding resistance, pressure resistance, fast construction, low cost, etc. The service life is up to 20 years.
Baidu Encyclopedia-Duct