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Any measurements made at the end of a duct or hose suffers from the turbulence problems. Even the spiral wire in the flex hose will cause problems.
The best measurements are made with a straight section of pipe and making measurements in the middle to avoid turbulence. Also, need to make appropriate measurements across the section.
I did some testing with a fan anemometer at the end of a pipe and got numbers that varied widely and not close to the actual flow.
On the Australian forum, wood work forums . com, BobL does a technical description of the precise way to measure flow and describes the issues of measuring at the end of a duct.
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