Abstract: A method facilitates the assembly of a turbine engine. The method includes providing a shroud support block having a forward end and an aft end, coupling a forward end of a shroud to the shroud support block using a forward fastener, and coupling an aft end of the shroud to the shroud support block using an aft fastener. The method also includes installing a locking pin through the aft fastener to retain the aft fastener, and staking the locking pin in the shroud support block, such that the locking pin is securely coupled to the shroud support block.

Abstract: A cooling fan module comprising a module housing and a fan assembly. The fan assembly comprises a blade assembly coupled to a motor disposed within a fan housing that is disposed within the module housing. The fan housing has an inlet and an outlet that is disposed within the module housing. A fan control circuit board is disposed within the module housing and outside of the fan housing. The fan control circuit board is coupled to the motor. An electrical connector is coupled to the fan control circuit board and projects outside of the module housing.

Abstract: The invention concerns a fixing system for at least one component of a pod of a turbojet on an engine strut to which the pod is attached and comprising at least one coupling zone provided by the component capable of co-operating with at least one complimentary coupling zone provided by the strut, and fixing means for providing with complementary fixing means a rigid and detachable connection between said component and the strut. The invention is wherein the fixing means and the complementary fixing means are capable of slightly pivoting relative to each other, as well as relative to a corresponding pod.

Abstract: A fan frame structure includes a plastic casing and a metal fixing frame. The plastic casing and the metal fixing frame are provided for an axial flow fan or a blower fan. The plastic casing includes a bottom having a plurality of first fixing portions. The metal fixing frame includes a base having a base with a shaft tube seat in a center thereof. The base includes a plurality of second portions each engaged with one of the first fixing portions. Since the plastic casing is made of inexpensive plastic material, the manufacturing costs are cut. The metal fixing frame provides sufficient structural strength and desired heat dissipating effect.

Abstract: A blade outer air seal (BOAS) has a body having an inner (ID) face and an outer (OD) face, first and second circumferential ends, and fore and aft longitudinal ends. The BOAS has one or more mounting hooks extending from the body. The OD face comprises a plurality of transversely elongate protuberances. The protuberances include rearwardly divergent first protuberances and forwardly divergent second protuberances.

Abstract: The invention relates to an extension (30) of an intermediate casing for an aircraft jet engine, intended to project towards the downstream end from an external shell of the intermediate casing, this extension comprising an annular connecting downstream end (64) forming an annular groove (66) open radially towards the outside, intended to receive nacelle covers. According to the invention, the annular connecting downstream end (64) is produced by means of a plurality of angular sectors (76a, 76b).

Abstract: A transition duct assembly with a thermally free aft frame and mounting system for use in a gas turbine engine are disclosed. The aft frame is capable of adjusting to thermal gradients while the mounting system provides for at least transverse movement of the transition duct during engine assembly. The mounting system also provides a means for raising the natural frequency of the transition duct outside of the engine's dynamic excitation ranges.

Abstract: A computer housing shock absorber device for a vibration source frame, which includes: a computer housing provided with a U-shaped holding space; an inner fixing frame fixed within the U-shaped holding space; an outer fixing frame; The shock absorber elements mounted on circumferential edge walls of the connecting holes of the inner fixing frame. Upper and lower portions of each of the recessed circular grooves of the shock absorber elements are respectively provided with a cylindrical body, and one of the cylindrical bodies of each of the shock absorber elements lies between the upper surface of the outer fixing frame and the upper surface of the inner fixing frame. Accordingly, the vibratory moment on the outer fixing frame produced by rotation of the fans is absorbed by the shock absorber elements.

Abstract: A fastener, for assembling a fan to a bracket, includes a shaft, and an expanding head extending from an end of the shaft. The shaft has a bulge formed at an opposite end thereof. A handle extends from the bulge of the shaft. The handle is used for facilitating an operator to manipulate the fastener to secure the fan and the bracket together. By pulling the handle of the fastener, the shaft of the fastener extends through the fan and the bracket to reach a position where the head and the bulge of the shaft of the fastener tightly sandwich the fan and the bracket therebetween.

Abstract: A conditioning unit can allow the blower to be easily translated from a first operable position in the conditioning unit to a second operable position external to the conditioning unit. The translation of the blower does not require the disconnection of the blower and, accordingly, does not require that the blower be disconnected and reconnected to the control system. Such capability can facilitate the installation of the conditioning unit into a variety of applications and allows the purchaser to customize the blower location based on the desired performance. The ability to customize the installation of the conditioning unit without requiring disconnection and reconnection of the blower can reduce the cost and expense associated with the installation into differing applications.

Abstract: An access door is provided in a housing for a gas turbine engine, with the access door being movable to an access position independent of any required movement of any cowl door or a fan duct door.

Abstract: An assembly for securely mounting and retaining a protective grill onto an appliance housing, comprising fasteners secured to the appliance housing and corresponding prongs extending from the protective grill wherein the grill may be removably mounted to the appliance housing by inserting the free end of the prong into an aperture in the fastener, whereby spring tension resiliently urges a portion of the fastener toward the opening over which the grill is mounted and around the prongs.

Abstract: A gas turbine engine rotor blade containment assembly (38) comprises a generally cylindrical, or frustoconical, metal casing (40). The metal casing (40) has at least one arched portion (62,64,66) and each arched portion (62,64,66) extends circumferentially around the metal casing (40). Each arched portion (62,64,66) comprises a radially inwardly extending arch (68) in which the trough (74) of the arch (68) is radially inwardly of a straight line (76) interconnecting the axial ends (70,72) of the arch (68). The trough (74) of the arch (68) is radially inwardly of the at least one of the axial ends (70,72) of the at least one arch (68). The arched portions (62,64,66) introduce compressive stresses into the metal casing (40) during a fan blade 34 impact and enable the metal casing (40) to withstand the impact. The fan blade containment assembly (38) is lighter for large diameter turbofan gas turbine engine (10).

Abstract: A fixing frame is used to fix at least one heat sink fan on a case of an electronic device. The fixing frame includes a cradle and at least one fastener. The cradle has two oppositely disposed plates, and the two plates respectively have a combining portion and a latching portion, such that at least one accommodation region is partitioned from the cradle for accommodating the fan, and the latching portion and the combining portion are combined with each other to form a clamping region. The fastener is disposed on the case and clamped in the clamping region, such that the cradle is fixed on the case.

Abstract: A mounting assembly includes a chassis having a plurality of opposite receiving tabs thereon, and a plurality of bracket subassemblies slidably mounted to the chassis along the receiving tabs of the chassis. Each bracket subassembly secures a fan therein and includes a bracket having a rear wall and two opposite sidewalls, a positioning member, and a lift-out apparatus attached to the bracket. The lift-out apparatus includes a clasping member fixed to the bracket, a sliding member slidably sandwiched between the sidewall of the bracket and the clasping member, and an elastic member. A locking structure is formed on the sliding member and the sidewall of the bracket. When the locking structure is unlocked, the sliding member is lifted out due to rebounding of the elastic member. The sliding member is then pulled to urge the bracket subassembly to disengage from the chassis.

Abstract: Disclosed is a system for aligning and sealing a turbine shell assembly an first shell assembly including at least one first shell segment, a second shell assembly including a tongue extending therefrom, a groove defined by the first shell assembly, the groove configured to mate with the tongue extending from the second shell assembly, at least one key structure disposable in the groove, the at least one key structure being associable with at least one surface of the at least one first shell segment, and at least partially sealable with a sealing surface of the tongue, and a tapered surface of the groove that is associable with at least a portion of the at least one key structure.

Abstract: A mounting system (100) for a turbocharger (106, 108) in an internal combustion engine includes a support base (110) having a top surface (134) configured for receiving the turbocharger and a recessed bearing surface (150) disposed on the turbocharger. The mounting system (100) also includes at least one bridging clamp (112) connected to the support base (110). The bridging clamp (112) includes a flange (120) having at least one wing (130, 132) that bears down on the bearing surface (150) of the turbocharger (106, 108).

Abstract: A modular ceiling fan housing unit designed to create a focused column or columns of downwardly moving air such that there is little deflection when the column or columns of downwardly moving air arrives at the ground level. The modular ceiling fan housing includes an elongated body element having a fluid impelling device to create the downwardly moving air. At least one plate disposed within the elongated body element directs the downwardly moving air into columns. The modular ceiling fan housing unit may be coupled to another modular ceiling fan housing unit to provide additional columns of downwardly moving air. The modular ceiling fan housing units may be coupled in various configurations, depending on the type of application. Furthermore, the modular ceiling fan housing unit or multiple modular fan housing units may be coupled to an elevated structure located either above or below the housing units.

Abstract: The invention relates to a cooling fan for a cooling system of the internal combustion engine of a motor vehicle, the cooling fan comprising at least one frame (10) for retaining a fan motor and a fan motor (24) for driving a fan wheel (26). The invention is characterized in that at least one motor casing component of the fan motor (24) is injection-molded into the frame material and/or is coated by said material by injection molding when the frame (10) is formed. The invention also relates to a method for producing said cooling fan. The method according to the invention is characterized in that at least one motor casing of the fan motor (24) is injection-molded into the frame material and/or is coated by said material by injection molding when the frame (10) is formed.

Abstract: Used in a thermal circulation system in which a fluid cooling agent is circulating in proper order through a compressor, a condenser, a capillary tube/expansion valve and a evaporator, an economizer is disclosed to include an enclosed vane wheel set in between the condenser and the evaporator and rotatable by the fluid cooling agent, two sealing structures mounted in the housing of the enclosed vane wheel to seal the gap between the housing and shaft of the enclosed vane wheel, and a cooling fan fixedly mounted on the shaft of the enclosed vane wheel outside the housing and rotatable with the shaft and the vanes at the shaft to cause currents of air toward the condenser for carrying heat away from the condenser.

Abstract: A fan device includes a connector, a fan, and an attachment assembly. The fan is configured to provide cooling to circuitry when the fan receives a power signal through the connector. The attachment assembly is configured to control attachment of the fan device to a chassis within an air duct defined by the chassis. The fan defines (i) a near side which faces the circuitry, (ii) a far side which faces away from the circuitry, (iii) an airflow axis which extends from the near side to the far side along an airflow direction, and (iv) a fan profile which is substantially perpendicular to the airflow axis. The fan is disposed substantially between the electronic circuitry and the attachment assembly when the fan device attaches to the chassis within the air duct. The attachment assembly has a width which closely mirrors that of the fan profile.

Abstract: Multistage centrifugal compressor having a horizontally openable tank, comprising a lower semi-tank and an upper semi-tank, a shaft having a series of rotors and a series of stages each of which comprising, in turn, a series of lower semi-diaphragms and a series of upper semi-diaphragms, a lower half-ring and an upper half-ring which can be coupled to form a bearing ring, the lower half-ring being fastened internally to the lower semi-tank , and the corresponding upper half-ring being fastened to the upper semi-tank , in each stage of the multistage centrifugal compressor, the lower semi-diaphragms are rigidly constrained to one another to form a first pile of lower semi-diaphragms and, the corresponding upper semi-diaphragms are rigidly constrained to one another to form a second pile of lower semi-diaphragms, the first pile can be constrained to the lower half-ring and the second pile can be constrained to the upper half-ring.

Abstract: A fan holder for mounting fans includes a first plate having a plurality of airflow openings, and a second plate having a plurality of airflow openings aligned with the airflow openings of the first plate, thereby forming a plurality of rooms for mounting the fans between the first plate and the second plate, an airflow-blocking member has an engaging piece on an upside and a flange on an underside, the engaging piece and the flange of the airflow-blocking member engage on the first plate, thereby the airflow-blocking member is mounted on the first plate to close the airflow opening.

Abstract: A fan (10) is disclosed having a base (11) and a protective housing (12) encasing an electric motor (13) and a blade assembly (14). The base has two pivot mounts (21) to which a front support leg (22) and a rear support leg (23) are mounted. Each leg includes a mounting flange (24). The pivot mounts allow the pivotal movement of the protective housing relative to the pivot mounts and about horizontal axis AA. The base also includes a ceiling mount portion (28) which is mounted to the ceiling C. The ceiling mount portion includes a mounting plate (32), a rod (33), and a cup-shaped coupler (34). The coupler has an annular groove (35) therein adapted to receive the mounting flanges. The coupler is configured to allow the flanges to be rotated while nested within the groove, thereby allowing pivotal movement of the fan about the rod and about vertical axis AB.

Abstract: A manifold mounting system for mounting an impingement cooling manifold to a casing of a turbine including a mounting pin affixed to a shroud pin of the turbine wherein the mounting pin extends through the impingement cooling manifold wherein the mounting pin comprises a securing device operable for securing the mounting pin to the impingement cooling manifold, and a leveling support leg affixed to the impingement cooling manifold wherein the mounting pin, securing device, and leveling support leg are operable for adjusting the gap distance between the impingement cooling manifold and the casing of the turbine.

Abstract: A fan frame includes a housing (10), a supporting base (20) and a plurality of ribs (30) connecting the housing with the supporting base. One of the ribs includes a bottom wall (33), and first and second lateral walls (31, 32) extending from two opposite sides of the bottom wall, respectively. A receiving groove (35) is defined between the bottom wall and the lateral walls. A securing tab (40) extends from an outer end of the first lateral wall towards the second lateral wall. A securing finger (42) extends aslant from a free end of the tab towards the second lateral wall. A slot (50) is defined between the finger and the second lateral wall with a width thereof gradually decreased inwardly. The tab, the finger, the bottom wall and the first lateral wall cooperatively define a gap (45) therebetween for extension of power wires (60) of the fan.

Abstract: Disclosed is a fastening structure for fastening a gas inlet flange of a turbo-molecular pump by a bolt to a flange of a target unit that will be subjected to a vacuum. The gas inlet flange has a slot-shaped bolt hole formed at a position adjacent to an outer peripheral edge thereof in such a manner that a longitudinal direction of the slot-shaped bolt hole approximately conforms to a direction tangential to the circumference of the gas inlet flange. A cushioning member made of foamed metal is disposed in the bolt hole. Even if an impact force occurs due to failure in the turbo-molecular pump, the cushioning member can receive the impact force to be applied from the gas inlet flange to the bolt.

Abstract: A device and a method for mounting a turbine engine, e.g., a gas turbine system, are described, in which a rotor unit is mounted to rotate inside a stationary external housing, having at least two supports for taking up the weight of the turbine engine, these supports being arranged at a spacing from one another in an axial longitudinal direction in relation to the external housing and at one side being articulated directly or indirectly on the external housing and at the other being supported directly or indirectly on a base frame. At least one support provides at least one support face which is supported exclusively in partial regions on at least two support plate elements. The at least one support face of the support is in operational engagement with the base frame by way of the support plate elements.

Abstract: A holding device for holding a cooling fan comprising: a duct having a hollow in which a cooling fan is to be fitted; a stopper portion which keeps one operative end of the cooling fan from further moving to hold the cooling fan at a fitting position; and a plurality of elastic wall segments formed in a cooling fan insertion end of a wall of the duct; wherein each of some of the plurality of elastic wall segments is formed with a locking claw for keeping the other operative end of the cooling fan from moving. With this construction, the cooling fan 31 can be more surely mounted in a duct. Consequently, vibration reduction effect and sound reduction effect with respect to the cooling fan is improved.

Abstract: A plastic compressor housing, in particular a radial flow compressor housing, preferably for a turbocharger, has at least one thermosetting plastic body for providing an intake pipe, a compressor duct, and an outlet pipe, and a thermoplastic at least partially covering the thermosetting plastic body in a hood-like fashion. The thermosetting plastic body is formed as a basic body and the thermoplastic is injection molded on the basic body. At least a first anchoring element is embodied on at least a first surface of the thermosetting plastic body and at least a second surface of the first anchoring element is substantially completely covered with the thermoplastic. The disclosure further relates to a method for producing a plastic compressor housing.

Abstract: A heat dissipating apparatus includes a bracket mounted in an equipment chassis, a fixing plate, a fan installed on the fixing plate, a rotating device mounted in the bracket and rotatably connecting with the fixing plate, and a circuit board fixed in the bracket. The circuit board includes a control circuit for controlling the rotating device to rotate the fixing plate to thereby change orientation of the fan.

Abstract: A cooling fan includes: a casing having a surrounding wall that defines an accommodating space; a circuit board disposed in the accommodating space and including a substrate and a control circuit, the substrate having a center portion that has a peripheral edge, and a plurality of spaced apart connecting beams that extend from the peripheral edge of the center portion and that are connected directly and securely to the surrounding wall; a hollow shaft secured directly to and protruding from the circuit board into the accommodating space; a stator mounted securely on the center portion of the substrate of the circuit board and coupled to the control circuit; a fan blade unit disposed in the accommodating space and including an annular hub journalled rotatably to the hollow shaft; and a rotor mounted on the hub.

Abstract: A vibration absorption for a fan includes a frame, fans, positioning outer jackets, and pins, wherein the positioning outer jacket is inserted into a latching hole of fan, an outer-projected circular ring of pin is attached to a first groove of frame, and a circular ring of ping is attached to a second groove of frame, so as to reduce a vibration force of fans and to increase a flow rate and a flow speed of air flowing out of the fans.

Abstract: A fan rack fixture for fixing a fan rack to a housing of an electronic device is disclosed. The fan rack fixture includes a first positioning portion installed on a first side of the fan rack, a first locking portion installed on a first side of the housing for fixing the first positioning portion, a second positioning portion installed on a second side of the fan rack and opposite to the first positioning portion, and a second locking portion installed on a second side of the housing for fixing the second positioning portion. By virtue of the fan rack fixture, the fan rack can be assembled/disassembled to/from the housing of the electronic device, even without the use of any tool.

Abstract: A housing assembly for a fan unit includes an upper housing having a lower engaging portion adjacent to its lower end surface and a lower housing having an upper engaging portion adjacent to its upper end surface. When one of the upper and lower housings rotates relative to the other about a center axis of the housings in a first direction with the opposing end surfaces of the housings in axial contact, the lower and upper engaging portions engage with each other. While the lower and upper engaging portions are in engagement, one of the lower and upper engaging portions presses the other in both axial directions to cause elastic axial deformation of the other; and one of the lower and upper engaging portions presses the other toward both the first direction and a second direction opposite thereto to cause elastic circumferential deformation of the other.

Abstract: A fan holder for mounting fans includes a first plate having a plurality of airflow openings, and a second plate having a plurality of airflow openings aligned with the airflow openings of the first plate, thereby forming a plurality of rooms for mounting the fans between the first plate and the second plate, an airflow-blocking member has an engaging piece on an upside and a flange on an underside, the engaging piece and the flange of the airflow-blocking member engage on the first plate, thereby the airflow-blocking member is mounted on the first plate to close the airflow opening.

Abstract: A cooling fan includes a fan housing (30) having a central tube (34) extending upwardly therefrom; the central tube has a bottom, annular protrusion (31). A bearing (61) is received in the central tube and mounted on the protrusion. A stator (20) is mounted around the central tube. A rotor (10) includes a shaft (18) having a free end (186) extending through the bearing and defining a notch (184) therein. A locking washer (63) engages into the notch of the shaft to limit movement of the shaft along an axial direction thereof. A balance structure (62) is arranged between the locking washer and the bearing. The balance structure is made of magnet and exerts a downwardly pulling force on the shaft to prevent the rotor from moving upwardly when the rotor is rotated.

Abstract: A fan including a frame and an impeller is provided. The frame includes a main body and a base. The base includes a shaft tube part and at least one vibration-reducing structure. The impeller is disposed on the shaft tube part. The shaft tube part extends from the base. The vibration-reducing structure is formed as one part of the base and is made of at least one high damping material for absorbing vibration during operation of the fan.

Abstract: The subject invention relates to a fan housing, comprising a unitary molded structure formed from a material that has a flame spread rating of twenty five or less. The unitary molded structure comprises a base, an impeller housing centrally located next to the base, and a flow path located circumferentially around the impeller housing with one or more defined walls for directing air flow. An exhaust port receives air from the flow path and outputs air in a particular direction.

Abstract: A diffusive cooling device includes a plate body, on which a cavity recessed outwardly is formed and an opening is arranged; a web plate jointed at the upper side of the plate body correspondingly; a plurality of passing openings arranged on the web plate to act as air passages; a scroll fan arranged between the plate body and the web plate in corresponding to the opening; a shell body connected to the bottom of the plate body and jointed to the web plate correspondingly to enclose and prop up the plate body therein; and, an air inlet arranged at the front side of the shell body, through which an ambient air is flowed into the shell body by the extracting and thrusting forces of the fan. During operation, airflow is generated along the cavity and extended to corresponding area of web plate to diffusively pass through the plural passing openings to achieve a cooling objective.

Abstract: A ventilating exhaust fan has a housing having a top, four sides, and an open bottom forming an air inlet. An exhaust outlet is located in one of the sides. A motor is housed within the housing and a fan is connected to the motor. The exhaust fan is mountable within an opening in a surface. The sides of the housing have a plurality of slots through which restraints can be inserted in order to connect the housing to the surface.

Abstract: The invention relates to a pump housing having means for fastening the pump to a holding face, wherein the housing has only two fastening points, wherein in each case one fastening point is situated on in each case one flange of the pump housing, and wherein the fastening points are formed either by means of a material projection which is aligned toward the holding face or by means of a flattened portion of the flange.

Abstract: A centerline suspension arrangement (42) for a turbine (40). A turbine inner casing (44) is supported within an outer casing (46) via a support member (60) that includes an inner portion (62) contacting the inner casing and an outer portion (66) extending into a slot (68) formed in the outer casing. The support member is slid into an axially oriented slot (64) formed in the inner casing and is body bound therein with respect to radial movements, with the support member and the inner casing slot including opposed vertical support surfaces (82, 90) and a pair of oppositely facing opposed horizontal support surfaces (80, 88 and 86, 92). Thus, dead weight and operating loads from the inner casing are reacted through the support member and into the outer casing without the necessity for any bolting or other fastener attachment in the design load path between the support member and the inner casing.

Abstract: A fan assembly includes an elongate support member having a first end portion and a second end portion. The fan assembly further includes a motor assembly including (i) a motor having an output shaft, and (ii) a support assembly that supports the motor, the support assembly being secured to the first end portion of the elongate support member. The fan assembly also includes at least one fan blade coupled to the output shaft of the motor so that rotation of the output shaft causes rotation of the at least one fan blade. In addition, the fan assembly includes a bracket assembly having (i) a base, (ii) a first support extending from the base, (iii) a second support extending from the base, (iv) a first jaw interposed between the first support and the second support, and (v) a second jaw interposed between the first support and the second support. The fan assembly also includes a first fastener. The first jaw and the second jaw are spaced apart from each other to define a space.

Abstract: The present invention provides a steam turbine that has upper and lower halves of diaphragm. The steam turbine of the present invention also provides an adjustable support bar attached to at least the upper half or the lower half of the diaphragm. The adjustable support bar of the present invention has a screw therein such that the adjustable support bar can raise or lower the upper half or the lower half of the diaphragm without removing each half of the diaphragm. Also provided are methods for adjusting and supporting a vertical position of the upper half and the lower half of the diaphragm at a horizontal split line in a steam turbine.

Abstract: A fan shroud structure includes a heat exchanger and a fan shroud. The heat exchanger has an upper tank and a lower tank, and the upper tank and the lower tank sandwich a core part therebetween. The fan shroud is attached to the heat exchanger, and the fan shroud has a wall portion and a flange portion projecting toward the heat exchanger from an outer circumference of the wall portion, and the flange portion including a lower flange portion. The lower flange portion is provided with a water discharge outlet for discharging water in the fan shroud outside of the fan shroud through the water discharge outlet.

Abstract: A method of fabricating an exhaust hood is provided for use with a turbine engine. The method includes providing an upper shell casing wherein the upper shell casing is fabricated from a composite material, and coupling the upper shell casing to a lower shell casing such that a turbine is housed within the exhaust hood, the shell casing is fabricated from a composite material. A turbine assembly is also provided.

Abstract: An engine casing assembly having dual load transfer points includes a U-shaped mid-turbine frame, an engine casing, a plurality of dimples, a strut and a mounting apparatus. The engine casing has an exterior surface and an interior surface. A plurality dimples are formed in the engine casing so that U-shaped protrusions are formed in the interior surface and U-shaped indentions are formed in the exterior surface. A strut connects one U-shaped protrusion to the mid-turbine frame and a mounting apparatus located within an indention so that a load is transferred from the mid-turbine frame to the engine casing and the mounting apparatus.

Abstract: A heat dissipation device and fan module. The fan module is fixed to a fan tray, which has a track with a first engaging portion. A securing member is disposed on a shield, comprising a second engaging portion. The second engaging portion enters the first engaging portion, fixing the fan module to the fan tray. An actuator connects the securing member and the shield. When external force deforms the actuator, the securing member deforms therewith, withdrawing the second engaging portion from the first engaging portion.

Abstract: A blower for a high efficiency furnace is provided with an increased interior space for accommodating an impeller of maximum practicable diameter. The blower includes a blower motor and a blower housing having a bottom piece and a top piece assembling with the bottom piece to define an interior of the blower housing. The top piece includes an annular lower support portion for supporting the blower motor and an annular upper portion extending above and around the lower portion. The upper portion has an outer peripheral edge and lugs extending outward beyond the outer peripheral edge. The lugs have lug holes to receive mechanical fasteners to secure the blower housing to an external device. The head of the mechanical fasteners are positioned above the lugs on the upper portion of the top piece. In this arrangement the diameter of the bottom piece is not limited by a need to accommodate spacing for the head of the mechanical fastener.