Roots fans are characterized by high pressure and high flow rate, which is mainly related to their working principle and structure. The following are the reasons for the high pressure and large flow rate of Roots fans:

1. Working Principle: The Roots fan is a positive displacement fan that draws gas in and pushes it towards the outlet through two rotating Roots gears. Due to its principle of operation, the fan can provide a continuous flow of gas, thus enabling high flow rates to be delivered.
2. Impeller design: The impeller design of Roots fans allows gases to be efficiently compressed in the chambers between the impellers. The geometry of the impeller and the number of blades determine the flow and pressure characteristics of the fan. Optimized impeller design enables Roots fans to generate high pressures in a relatively small volume.
3. pulsation-free flow: Roots fans operate without significant pulsation and have a relatively smooth gas flow. This pulsation-free flow helps to provide stable high pressure and high flow output.
4. High efficiency design: Roots fans are often optimized for high energy conversion efficiency. A highly efficient design allows the fan to convert more of the input power into gas flow energy, resulting in higher pressure and flow rates.
5. Structural robustness: Roots fans are often ruggedly constructed to withstand high pressures and workloads. This makes them suitable for applications requiring high pressure and flow rates.
6. Micro-positive pressure operation: Roots fans are usually operating at slightly positive pressure. As the Roots impeller rotates, the gas is forced in from the inlet side and is pushed towards the exhaust side by centrifugal force. Due to the movement of the impeller, the gas is compressed and pushed out of the fan. This mode of operation allows the Roots fan to deliver high pressures.
7. Dual inhalation port structure:Roots fans usually have a dual intake structure, which means that the gas can be drawn in from two directions. This design allows the Roots fan to draw in more gas at the same time, resulting in a larger flow rate.

The ability of Roots fans to provide high pressures and high flow rates is due to the combined effect of their operating principle, impeller design, flow characteristics and structural design. This makes Roots fans important gas conveying and pressurizing equipment in many industrial sectors.