Square in-line centrifugal fans designed to eliminate costly round to square ductwork transitions with the flexibility of any angle operation. XD is direct driven, available in five sizes with capacities up to 5445 CFM and up to 1 3/4” static pressure. AMCA “B” spark resistant construction is standard on both models. The XD is suitable for airstream temperatures up to 140°F.   Features Housing  Heavy duty galvanized steel construction Removable side panels on both sides for easy access and serviceability Fully gasketed and bolted access panels provide weather protection Centrifugal Wheel Aluminum construction with backward curved hollow airfoil blades Non-overloading design for safe operation Precision balanced for smooth vibration free operation Bearings Permanently lubricated in an Acme D.S. pillow block housing Bearings are resiliently mounted in neoprene rings Rated at L50 life of 200,000 hours 5 year limited warranty on Acme D.S. pillow block bearings Pillow block bearings are standard on XB425 Drive Assembly Located out of the airstream Cast iron drives sized for 150% of drive horsepower Static free, oil and heat resistant belts Motors Continuous duty motors located outside the airstream Prelubricated ball bearings   Options/Accessories Aluminum Housing Solid State Speed Controllers Dampers Coatings Guards/Covers Isolators Filter box Side Discharge Flange Insulated Housing