Air Supply of The Future Gast Regenair® R5325A-2 R5 Regenerative Blower; 2.5 HP, 3-Phase, 230/460 Vac with a rugged construction that's suitable for demanding applications, the R5 offers oil-less operation ensuring that the discharge air remains free of contamination. The R5 can be mounted in any plane, which provides flexibility when mounting or integrating the blower into an OEM system. In addition, these blowers have very few moving parts and no wearing components, which minimize downtime and helps to lessen operating noise levels.