Industry scenarios encode common practice: dust collection checks silting risk against duct velocity, boiler draught converts flue-gas flow and temperature, fire smoke exhaust takes code airflow and prefers certified models.
Dust and silting checks：Ducts below the minimum transport velocity silt up; each segment is checked and the page suggests higher velocity or a different diameter
Boiler draught and hot gas：Hot gas is corrected for temperature and altitude, so pressure and shaft power follow (the same airflow needs less head when hot)
Fire smoke and certification：Fire smoke and explosion-proof duties filter candidates by certification tags, and say when a model has no tags recorded
Guangzhou XIN FENG Co., Ltd. · Industrial Fan Selection System