Quote:
Originally Posted by kach22i
I've seen this type of beveled jet intake step before, can anyone please explain to me why it is there? |
It's not beveled. The "ring" around the blades is rub-area which is made to be as near blades as possible. Blades actually rub/abrade this area during first start in order to make as small tolerance/distance as possible. The more air escapes between the case and the fan, the less efficient the fan gets. Thus they go great lengths to achieve small tolerances.
Darker area in front is, as far as I remember, perforated sheet metal. It helps dampen the noise. The profile from leading edge to fan should be smooth though...