What happens when a large fan and a small fan are connected in series?

Which one is in front? Is the pressure the same?

What would happen if an 8-lane highway suddenly became 4 lanes? :lol

Series for pressure boosting, parallel for flow enhancement – your question isn’t clearly stated; it’s not clear which comes first and which comes later. Whether the static pressure is higher or lower will affect the final result~~

Firstly, fans are used in series to increase the static pressure needed to overcome system resistances such as those associated with pipes. In other words, when the static pressure generated by a single fan is not sufficient to overcome all the system resistances, one or more additional fans are used to deal with the remaining resistance, while the air volume remains constant. Therefore, when selecting fans, ones with the same air volume but different total pressure should be chosen. Secondly, at the installation site, it is important to ensure that each fan operates at its maximum efficiency; in other words, each fan should be responsible for a specific section and should not interfere with one another. When the air volume of the two fans is the same but their total pressure differs, a proper positioning is essential; if the positioning is incorrect, the actual air volume will not match the designed value, and it is possible for the motor to be damaged.