Quote:
Originally Posted by sammyg2
From the picture it looks like the duct is flattened without increasing the width (maintaining overall volume).
If the ducting is over-sized and can flow more than the fan puts out with minimal restriction, then it'll be fine. But if the ducting is sized correctly for the fan, the restriction will reduce flow.
If that is the case and it is a true reduction in cross-sectional area, then he pressure will INCREASE right before the restriction, which will increase pressure, which will increase velocity. But the flow will be decreased.
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It sorta does but if you follow the reflection of the camera flash, I see an angle indicating that the oval is wider than the diameter of the round.