For maximum efficiency, MacroAir's AirVolution-D features gearless motor coil made up of copper ring with ultra-low resistance. Model 370, available with blades from 6–12 ft, integrates into most small spaces. With blades from 8–18 ft, Model 550 is effective at controlling temperature and humidity in medium-large spaces. Designed for heavy-duty applications, Model 780 has 20–24 ft blades, making it suitable for extra-large spaces. Finally, AirVolution-D3 offers entry-level solution.