Abstract: A blower (10) comprises a relatively large outer housing (16) positioned concentrically around and in spaced-apart relation to an inner housing (15). The space between the inner housing (15) and the outer housing (16) defines an air intake (25) which leads into an air intake chamber (26). A high efficiency carbon filter (22) and a fiberglass filter (23) are positioned together within air intake chamber (26) and filter air as it flows therethrough. After filtration, the air is directed by an impeller (30) within inner housing (15) downwardly through vanes (35).

Abstract: An air blower adapted to be mounted to the ceiling of a room to create a gentle circulation of air in such room. The blower includes a motor-driven impeller mounted in generally cylindrical housing and a vane unit having a first plurality of relatively large vanes disposed in radial planes with respect to the axis of rotation of the impeller, and a second plurality of relatively small vanes disposed in radial planes equally offset from the larger vanes and disposed adjacent the downstream portion of the large vanes. The vane unit is detachably mounted to the blower housing to permit removal of the vane unit for cleaning.