Should I tape over the L ranges on my 1000/2000/3000 series fan? | Retrotec

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Should I tape over the L ranges on my 1000/2000/3000 series fan?

Answer

​The L ranges on the fan are designed to be left open unless you are using L2 or L1.

Covering those four 1 inch holes in the center of the C8 plate will cause range C1 to read about 25% higher and C2 to read about 12% higher flow.