Suppose you have 6 small fans on a condensor.
They're rated each at 800 m³/h at 0 pressure rop.
Once mounted in the condensor, you measure a flow of 1.3 m/sec.
Given the are of the condensor, you find that the flow/fan is 400 m³/h.
Lookin now in the fan chart, you find an actual pressure drop of 100 Pa for the coil.
Suppose we install now 12 identical fans, what will be the flow through the condensor? It will be not the double because pressure drop will increase due to the increased flow.
This is not a riddle but a serious question.

Suppose we install 2 other fans with a free flow of 2.500 m³/h and which gives each 1.800 m³/h at 100 Pa pressure drop. How can you predict the flow because the 2 will give 3.600 m³/h at 100 Pa.

I'm confused a litlle bit.

We made a condensor and flow is too low (.3 m/sec through the condensor)
How will the codnensor capacity adapt to this increased flow? It will be anyway not a proportional function.