Table 1 Experimental uncertainties for the measuring variables

Static pressure rise

y₁ (mm)

\( {\mathit{\mathsf{U}}}_{{\mathit{\mathsf{y}}}_{\mathsf{1}}}=\pm \mathsf{0.01} \) mm of water

Air flow rate

y₂ (mm)

\( {\mathit{\mathsf{U}}}_{{\mathit{\mathsf{y}}}_{\mathsf{2}}}=\pm \mathsf{0.01}\kern0.24em \) mm of water

Wattage input

IP (W)

\( {\mathit{\mathsf{U}}}_{\mathit{\mathsf{IP}}}=\pm \mathsf{0.25} \) Watts