Fan outlet shape
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I have a minor question: the fan outlets come in square and circular shapes – what’s the difference between them?
There’s no particular reason for this – square tubes are inexpensive and easy to manufacture on site, while round tubes have a higher pressure-bearing capacity. It depends on the requirements; let’s see what others have to suggest.
Taking the D-type fan as an example, in my opinion – it is mainly due to structural requirements. The outlet of the fan is square, as this design ensures adequate flow of air generated by the final impeller and helps reduce air resistance. Among shapes with the same area, a circle has the smallest dimensions; if the outlet were made circular, its size would likely need to cover the secondary impeller as well. Square is transformed into a circle to achieve a compact structure.
Square outlets present less resistance compared to circular outlets, and square volutes also have better fluidity than circular volutes