The Lau 028957-21 is a single inlet blower wheel made for direct drive applications. This wheel has a 4-1/4" diameter and a 2-1/2" width with a 3/8" bore. The Lau 028957-21 is rated for a max RPM of 4500 and CW rotation.
Typical applications for this blower wheel are packaged terminal air conditioner (PTAC) systems, room air conditioners, fan coil units, draft inducers, power burners, and heaters.
NOTE: The bore can be bored out to fit odd or larger sizes up to 5/8". Also, two of these single inlet blower wheels can be combined to replace a double inlet wheel.