Fan blades and propellers are used to replace worn or damaged blades and propellers. Bent or pitted fan blades affect system performance and can cause motor wear and unwanted noise. They are also often replaced when motors are replaced to ensure blades are balanced and functioning correctly. Aluminum fan blades are lightweight and suitable for use in extreme temperatures. Condenser fan blades are used to replace worn or damaged blades in HVAC condensers. Condenser propeller hubs connect the fan blade to the motor drive shaft. Plastic fan blades are lightweight and corrosion resistant for use in harsh environments. Tube axial fan blades circulate air through low pressure and low air flow ducts.