UL 705 Listed - AMCA Air and Sound certified performance - Flanged outlet - Inlet collar for slip-fit duct connection - Fully welded straightening vanes - Lube lines extended to exterior of unit - High efficiency airfoil wheel - Heavy gauge spun aluminum inlet cone - Continuously welded heavy gauge housing - Heavy duty relubricatable, self-aligning bearings rated for 200,000 hours average life - Precision turned ground & polished solid steel shafts sized for critical speed of 125% of max cataloged conditions - All steel components Lorenized baked powered paint finish - Integral adjustable motor mounting plate - Continuously welded, dynamically balanced wheels - Static resistant belts - Pre-punched mounting holes - Lifting lugs on all sizes - Corrosion resistant fasteners.