Abbreviations used in the table have been explained below:

• A — Pressure loss in ducts. Total pressure (Pa)

• B — Volume flow rate (dm³/s)

• Continuous line (—) — Extract air

• Broken line (┄) — Supply air

• SFP = $\frac{\mathrm{Input\; power\; (total)\; (W)}}{\mathrm{Air\; flow\; (max)\; (l/s)}}$

  SFP rate (Specific Fan Power) recommended value <1.8 (kW m³/s). When a lower total pressure is used, also the SFP of the speed is lowered.