BLOWER, WHEEL TYPE FORWARD-CURVED, INCLUDES DRIVE PACKAGE YES, ASSEMBLY UNASSEMBLED, WHEEL DIAMETER 18 1/2 IN, AIRFLOW @ 0.125 IN SP 6,515 CFM, AIRFLOW @ 0.250 IN SP 5,960 CFM, AIRFLOW @ 0.375 IN SP 5,220 CFM, AIRFLOW @ 0.500 IN SP 3,820 CFM, MAXIMUM STATIC PRESSURE 1/2 IN WC, MAXIMUM INLET AIR TEMPERATURE 140 DEGREES F, SHAFT DIAMETER 1 IN, BEARING TYPE BALL, SOUND LEVEL 11.3 SONES @ 0.250 IN SP AND 5 FT, 13.8 SONES @ 0.125 IN SP AND 5 FT, WHEEL