BLOWER, WHEEL TYPE FORWARD-CURVED, INCLUDES DRIVE PACKAGE YES, ASSEMBLY UNASSEMBLED, WHEEL DIAMETER 18 1/2 IN, AIRFLOW @ 0.125 IN SP 8,515 CFM, AIRFLOW @ 0.250 IN SP 8,120 CFM, AIRFLOW @ 0.375 IN SP 7,685 CFM, AIRFLOW @ 0.500 IN SP 7,185 CFM, AIRFLOW @ 0.750 IN SP 5,535 CFM, MAXIMUM STATIC PRESSURE 3/4 IN WC, MAXIMUM INLET AIR TEMPERATURE 140 DEGREES F, SHAFT DIAMETER 1 IN, BEARING TYPE BALL, SOUND LEVEL 20 SONES @ 0.250 IN SP AND 5 FT, 23 SONES