DAYTON STANDARD-DUTY BELT-DRIVE 24 EXHAUST FAN IS DESIGNED TO BE USED IN COMMERCIAL APPLICATIONS THAT REQUIRE HIGH VOLUMES OF AIR AT LOW STATIC PRESSURES THE FAN FEATURES A 6-BLADE GALVANIZED-STEEL PROPELLER RIGID DRIVE-FRAME RAILS AND A 1-PC MOTORBEARING PLATE VARIABLE PITCH AND ADJUSTABLE MOTOR PULLEY OPTIMIZE FAN PERFORMANCE MOUNT FAN VERTICALLY FOR EXHAUST OPERATION HORIZONTALLY FOR SUPPLY• DRIVE PACKAGE SOLD SEPARATELY• AIR HANDLING-QUALITY BEARINGS MEET A MINIMUM OF L10-100000 HR• U