Hello,
I'm a bit confused because I though centrifugal fans were better than axial ones. I was looking in a catalogue and it said that for four inch fans the axial moved 80-odd cubic metres per hour but the centrifugal only managed 60-odd.
Is it that in optimum conditions axial fans will move more air? Is it that centrifugal fans are better only once the ducting becomes longer? If so, at what length of ducting should the switch from axial to centrifugal take place?
Or is it that these are maximum values when there is nothing behind the fan, used only for marketing? Is it that in all practical applications the centrifugal will move more air?
Thanks.