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A propeller-type fan including a pressure housing for improving air flow past a motor which powers the fan.

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A propeller-type fan including a pressure housing for improving air flow past a motor which powers the fan. djustable wear plate positioning assembly (150) of claim 1 wherein: said releasable locking means (186, 188) includes a plurality of threaded fasteners (186) extending between said front wa

A propeller-type fan including a pressure housing for improving air flow past a motor which powers the fan. djustable wear plate positioning assembly (150) of claim 1 wherein: said releasable locking means (186, 188) includes a plurality of threaded fasteners (186) extending between said front wall (126) and said mounting plate (180). 4. The adjustable wear plate positioning assembly of claim 2 wherein: said releasable locking means (186, 188) includes a plurality of threaded fasteners (186) extending between said front wall (126) and said mounting plate (180). 5. The adjustable wear plate positioning assembly (150) of claims 1, 2, 3, or 4 wherein: said wear plate carrier (160) has a plurality of spaced apart struts (174) extending between said inner (166) and outer (162) ends; said inner (166) and outer (162) ends are generally annular; and respective fluid sealing members (190, 192) extend between said inner (166) and outer (162) ends of said second (168) and first (164) apertures. 6. The adjustable wear plate positioning apparatus (150) of claim 5 wherein: said outer end (162) of said wear plate carrier (160) has a passage (196) extending axially therethrough and a removable cover (180) over said aperture (196) to provide access to aid impeller (104). 7. The adjustable wear plate positioning assembly (150) of claim 6 wherein: said mounting plate (180) is removably secured to said outer end (162) and acts as said cover (180). ce; a shroud element including a shroud exit surface and defining a tip gap between said flared inner discharge surface and said shroud exit surface, said shroud exit surface being substantially coincident with said flared inner discharge surface; and a front plate including a trailing edge, said trailing edge is positioned inboard of a leading edge of said rotating ring element. 16. A fan assembly comprising at least one impeller blade; a rotating ring element having a flared inner discharge surface; a shroud element including a shroud exit surface and defining a tip gap between said flared inner discharge surface and said shroud exit surface, said shroud exit surface being substantially coincident with said flared inner discharge surface; and a front plate including a trailing edge, said trailing edge is substantially coincident with a leading surface of said rotating ring element. faces at least as great as the length of the bushing groove (30); the assembly (10) being characterized by: the assembly (10) having at least one second hole (H2) for receiving the threaded rod (26), the hole (H2) extending at least partially along the mating surfaces from the second face (24) of the assembly (10) toward the first face (22) of the assembly (10), the hole (H2) being formed in part by a groove (32) located in the toothed wheel (12) and in part by a groove (34) located in the bushing (14), wherein the bushing groove (34) has a length as measured along the mating surfaces at least as great as the length of the wheel groove (32) and wherein the wheel groove (28) partially forming the first hole (H1) and the bushing groove (34) partially forming the second hole (H2) are identical in configuration and the bushing groove (30) partially forming the first hole (H1) and the bushing groove (32) partially forming the second hole (H2) are identical in configuration. 2. An assembly (10) as set forth in claim 1 wherein the wheel groove (28) partially forming the first hole (H1) and the bushing groove (34) partially forming the second hole (H2) have threads (52) for receiving a threaded rod (26). 3. An assembly (10) as set forth in claim 2, wherein the bushing groove (30) of the at least one first hole (H1) terminates in a surface (48) to form the bushing groove as a blind half hole and the wheel groove (32) of the at least one second hole (H2) terminates in a surface (50) to form the wheel groove (32) as a blind half hole. 4. An assembly (10) as set forth in claim 1 wherein the at least one first hole (H1) is connected to the at least one second hole (H2) by a passage (40) smaller in cross-sectional area than the interconnected holes (H1,H2). 5. An assembly (10) as set forth in claim 1 wherein the surfaces adjacent the grooves (28, 30) of the first hole (H1) on the first face (22) include a shoulder (54) adjacent the bushing groove (30) formed by the bushing groove (30) and the surface of the bushing (14) and the wheel groove (28) has threads (52) and the surfaces adjacent the grooves (32, 34) of the second hole (H2) on the second face (24) include a shoulder (54) adjacent the wheel groove (32) formed by the wheel groove (32) and the surface of the wheel (12) and the bushing groove (34) has threads (52). 6. An assembly (10) as set forth in claim 1 wherein the first face (22) of the assembly (10) has a separation hole formed from a groove in the toothed wheel (12) and a groove in the bushing (14) and the second face (24) of the assembly (10) has a separation hole formed from a groove in the toothed wheel (12) and a groove in the bushing (14). 7. An assembly (10) as set forth in claim 6 wherein one of the grooves partially forming one of the separation holes has an shoulder (54) adjacent to the groove and the other groove partially forming the separation hole is threaded and has a cavity (38) beginning at the face (22) or (24) of the assembly (10) and extending partially along the groove. 8. An assembly (10) as set forth in claim 6 wherein on the first face (22) of the assembly (10) has two first holes (H1) and a separation hole and the second face (24) of the assembly (10) has two second holes (H2) and a separation hole.