What does the white sleeve on the 56M13 indicate

maximizing the AFUE rating of the host appliance by optimizing the surface area for fluid-to-gas heat transfer

airflow will drop significantly

protecting the evaporator coil and improving indoor air quality

providing reliable system protection for HVACR refrigeration units

Lau 6130640001 Fan Blade 319847-401 What does the white sleeveThe Lau 6130640001 Fan Blade is a heavy duty, aluminum propeller engineered specifically for high demand HVAC condenser units and industrial ventilation systems. This 22 inch diameter component features a 24 degree pitch and a 3 blade configuration, optimized to move high volumes of air while maintaining balanced operation to reduce mechanical vibration. Designed for clockwise (CW) rotation, it includes a 1 2 inch bore positioned on the intake side