The ratio air speed design on the air force condensers is 250 L/s - 500 L/s Is it true this ratio applied in the manufacture of the condensers?

The air ratio on the condenser ranging between250 -500 cm \\ sec, air ratio was identified experimentally , because the air speed have been already identified experimentally in the factory and knowing factory. Due to the large number of variables, most of the fan condensers being produced and delivered with fan or impellers.