The invention pertains to a straw chopper (36) for an agricultural harvesting machine, comprising a housing (40), a rotor (42) carried in said housing (40), said rotor (42) including a center chopping section (50) comprising pendulously mounted straw chopper blades (56) cooperating with stationary knifes (44) mounted to said housing (40) and a pair of fans (52) respectively positioned at longitudinally outboard ends of said center chopping section (50), each said fan (52) including a hub (60) rotatable in a direction of rotation, and a plurality of fan blades (64) connected with said hub (60) at a plurality of angularly spaced locations about said hub (60).It is proposed that a scroll housing (66, 80, 82, 84) is attached to said housing (40) and positioned radially outboard from said plurality of fan blades (64).
