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Thread: Duct Size for a Clearvue 1800

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  1. 04-23-2019, 4:04 AM #16
    Allan Speers's Avatar
    Allan Speers
    Allan Speers is offline Member
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    Quote Originally Posted by David Kumm View Post
    A curved blade impeller delivers high cfm at low SP but falls off quickly under pressure.

    Dave, from what I've read, that's only true of FORWARD curved impellers. Backwards curved impellers give less CFM, but are much more tolerant of high pressure. (Again, only based on something I read recently.)

    Since modern Cyclone impellers are mostly backwards curved, this is an important distinction.
    Last edited by Allan Speers; 04-23-2019 at 1:22 PM.
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