Fan arrangements and designation
The need for understanding between fan manufacturers and system designers is nowhere more apparent than in the nomenclature for describing the fan inlet and outlet orientation. The history of attempts at removing any possible misunderstanding is described with a few words, but the illustrations are of most importance. Someone once said that one good picture is worth a thousand words. For once the author was dumbstruck!
Over the years the need for understanding between manufacturers and their customers has determined that an agreed nomenclature for centrifugal fans and their components was absolutely essential. This applied to both positions of the outlet flange and the mechanical driving arrangements. Motor positions for indirect drives also had to be categorised. Whilst individual companies often had their own coding, this was not necessarily helpful in a competitive situation. Confusion could arise e. g., when one manufacturer’s Arrangement 1 was designated Arrangement 3 by another.
Posted in Fans Ventilation A Practical Guide