Supply/extract air volumes and input power Figure 1. Fan input power (99 MV) Figure 1. Fan input power (99 MV CF) SFP = Ottoteho (yht.) (W) Ilmavirta (max)(dm 3 /s) The recommended SFP rate (Specific Fan Power) value <1.8 kW/m3/s). Figure 3. Supply and extract air volumes (99 MV) Figure 4. Supply and extract air volumes (99 MV CF) Continuous line (—) Extract air Broken line (- -) Supply air