Abstract: New heat removal systems and methods allow a combination of active and passive thermal processes for removing heat from and cooling air in environments. Systems and methods include a heat removal system including an adjustable thermal feed cold air intake system, a distribution system for cold and warm air including one or more hot aisles and one or more cold aisles, and a convection system to draw cool air through the building using a naturally-occurring convection processes to expel hot air. Misters, cooling elements, and/or freezer boxes may further cool the intake of air. A controller is programmed to efficiently manage and control the climate (e.g., temperature, humidity, air flow, pressure, air quality, etc.) within a building to minimize the use for energy for air distribution and cooling.

Abstract: An additional part to be located in an air vent and an air vent for a ventilation system including a number of elements, which air vent lets air enter the ventilation system and/or move away from the ventilation system. The additional part of the air vent includes one or several sensors measuring parameters related to air quality, a data transfer interface for implementing data transfer between the air vent and other elements of the ventilation system, and a processing unit which is automatically configured to determine changes needed in the settings of the ventilation system on the basis of parameters measured by the sensors and send information on the changes needed in the other elements of the ventilation system through the data transfer interface.

Abstract: In the specification and drawings, an isolation enclosure and method for conducting hot work is described and shown with an enclosure; a negative pressure atmosphere within the interior of the enclosure; a hot work apparatus operable outside of and adjacent to the enclosure; and a detector located so as to be capable of detecting the presence of combustible gas within said enclosure. A method of conducting hot work is also described and shown.

Abstract: An apparatus is provided in one example embodiment and includes a plate having a plurality of perforations configured in a pattern. The pattern includes the plurality of perforations arranged in concentric circles centered at a point. Each of the perforations is a closed shape comprising four edges, with rounded corners between adjacent edges, with two opposite edges of each of the perforations including non-parallel straight lines and two other opposite edges comprise concentric, offset curved lines. The non-parallel straight lines may form an angle with a vertex at the point, and the concentric curved lines may be centered at the point. The perforations in each concentric circle may be angularly spaced around the point. The apparatus may further include a substantially circular fan.

Abstract: A hot/cold aisle air containment room includes a plurality of electronic equipment enclosures at least partially defining an interior aisle, a frame structure supporting one or more ceiling panels above the interior aisle, and a door assembly. The door assembly includes a sliding door and an unpowered door closer mechanism adapted to move the sliding door from an open state to a closed state, thereby providing controlled access to the interior aisle and minimizing intermixing of hot air and cold air between an environment external to the hot/cold aisle air containment room and an environment internal to the hot/cold aisle air containment room.

Abstract: A data center cooling system includes a plurality of server racks aligned within a row in a human-occupiable workspace of a data center, the server racks supporting a plurality of heat-generating computing devices; a warm air aisle positioned adjacent the server racks opposite the human-occupiable workspace and including a warm air inlet adjacent to a back side of the row of server racks and a warm air outlet in fluid communication with a warm air plenum; a plurality of cooling modules each including at least one fan and a cooling coil; and a controller to perform operations including controlling the plurality of fans in the plurality of cooling modules to operate at a specified fan speed, and controlling a plurality of valves fluidly coupled to the plurality of cooling coils in the plurality of cooling modules to modulate to a specified valve position.

Abstract: A multi-parameter patient monitoring device rack can dock a plurality of patient monitor modules and can communicate with a separate display unit. A signal processing unit can be incorporated into the device rack. A graphics processing unit can be attached to the display unit. The device rack and the graphic display unit can have improved heat dissipation and drip-proof features. The multi-parameter patient monitoring device rack can provide interchangeability and versatility to a multi-parameter patient monitoring system by allowing use of different display units and monitoring of different combinations of parameters. A dual-use patient monitor module can have its own display unit configured for displaying one or more parameters when used as a stand-alone device, and can be docked into the device rack when a handle on the module is folded down.

Abstract: Server racks that are integrated with cold air delivery are described. Each server rack has a tube having a hollow space therein. The hollow space is used to deliver cold air via one or more valves to one or more servers. The one or more valves are either integrated or fitted to the server racks. The use of the hollow space by itself increases pressure of the cold air. There is no need to use a large fan that consumes a large amount of energy to pressurize the cold air and no need to use a raised floor.

Abstract: A data center includes a first rack, a second rack, a supply duct provided over a first space between the first and second rack, a first circulation duct including a first suction port disposed at an end side of the first rack and a first exhaust port disposed at the first space side and provided between an upper portion of the first rack and the supply duct so as to close up the first space, a second circulation duct including a second suction port disposed at an end side of the second rack and a second exhaust port disposed at the first space side and provided between an upper portion of the second rack and the supply duct so as to close up the first space, a first and second barrier that closes up the first space at one and the other end of the first and second rack, respectively.

Abstract: The invention relates to an antenna arrangement (1) having an antenna arrangement housing (12), in which antenna arrangement housing (12) there are arranged an antenna (14), antenna electronics (16) for driving the antenna (14), and a fan unit (30) for active cooling of the antenna electronics (16), which fan unit (30) comprises a fan housing (40) having a plurality of fan unit side surfaces (41 to 48), which comprise a first fan unit housing side surface (41) and a second fan unit side surface (42; 43, 45), in which fan unit housing (40) there are arranged at least two fans (50), wherein the fan unit housing (40) has fluid passage openings (61, 62) on the first fan unit housing side surface (41) and on the second fan unit housing side surface (42; 43, 45) in order to permit a fluid (18) to flow through the fluid passage openings (61, 62).

Abstract: A rack test room is disclosed that provides a controlled and monitored environment for one or more server racks, the room controlling and monitoring the cold aisle temperature, the cold aisle air inlet flow rate, and the hot aisle temperature. A rack test room is disclosed that monitors the inlet and exhaust air temperatures for each server in a rack. A rack test room is disclosed that individually controls and monitors the inlet air flow rate to each of a plurality of server racks. A method is disclosed for using a rack test room to simulate a data center environment.

Abstract: A method for enhancing the cooling efficiency of a computer room air conditioning unit, in a data center, is provided. Raised floor panels are carried on a pedestal support system. The floor panels divide a data center, into upper and lower plenums. A cold aisle is includes air-grate floor panels. The computer room air conditioning unit is operated to condition a heated hot aisle return air flow. A server rack has a front, a back, and side rack support frame members. The support members define an interior server compartment. At least one damper door frame has a top, a bottom and side members. The door frame members define at least one open air flow panel portion. A series of horizontal damper blade members are pivotally mounted in the open panel portion. The damper blade members are pivoted to direct a stream of the conditioned air flow over heat generating components contained in the interior server compartment in order to elevate the temperature of the heated return airflow at the air conditioning unit.

Abstract: New data center heat removal systems and methods allow a combination of active and passive thermal processes for removing heat from and cooling air in data center environments. Systems and methods include a data center heat removal system including an adjustable thermal feed cold air intake system, a distribution system for cold and warm air including one or more hot aisles and one or more cold aisles, and a convection system to draw cool air through data center equipment using a naturally-occurring convection processes to expel hot air. Misters, cooling elements, and/or freezer boxes may further cool the intake of air. A controller is programmed to efficiently manage and control the climate (e.g., temperature, humidity, air flow, pressure, air quality, etc.) within a data center to minimize the use for energy for air distribution and cooling.

Abstract: A local air cleaning apparatus (1) is provided with a push hood (2) having an air flow opening face (23) for blowing out a cleaned uniform air flow and a guide (3) provided on a side of the push hood (2) having the air flow opening face (23), the guide (3) extending from the side thereof having the air flow opening face (23) toward a downstream side of the uniform air flow to form an opening face (31) at a downstream end portion thereof. The push hood (2) is arranged such that the uniform air flow blown out from the air flow opening face (23) passes through the inside of the guide (3) and then collides with an air collision face (W) on a downstream side of the opening face (31). The opening face (31) of the guide (3) is spaced apart from and opposed to the air collision face (W) to form an open region between the opening face (3) and the air collision face (W).

Abstract: An electronic module for engaging an electronic equipment enclosure may include a module body having a front face, at least one electronic device in the module body, and a resilient sheet-metal member connected to the module body. The resilient sheet-metal member may have a face portion substantially coextensive in area with the front face of the module body and may have a tab portion substantially perpendicular to the face portion. The tab portion may include a catch portion configured to engage a portion of the enclosure.

Abstract: A system may include a plurality of temperature sensors configured to sense temperatures at a plurality of locations associated with an information handling system, a cooling subsystem comprising at least one cooling fan configured to generate a cooling airflow in the information handling system and a thermal manager communicatively coupled to the plurality of temperature sensors and the cooling subsystem. The thermal manager may be configured to, based on at least a power provided to a subsystem of the information handling system, estimate a thermal condition proximate to the subsystem and set a speed of the at least one cooling fan based on the estimated thermal condition and a required linear airflow velocity associated with the subsystem.

Abstract: A ventilation cover for an electrical enclosure having an aperture that includes a peripheral edge. The cover includes an inner shell having a plurality of inner slots, wherein each inner slot is separated from another inner slot by an inner wall portion. The cover also includes an outer shell for receiving the inner shell, wherein the outer shell includes a plurality of outer slots and each outer slot is aligned with an associated inner wall portion wherein each inner wall portion is adapted to divert water which enters an outer slot. In addition, the cover includes a lip formed around the peripheral edge for inhibiting the flow of water into the aperture.

Abstract: Provided is an outdoor unit of an air conditioner which has good assembly stability by more cheaply and easily increasing mechanical strength of a housing, and in which the cost thereof is further suppressed by reducing the number of components such as screws, as an outdoor unit of a large air conditioner including two blowers. The left front pillar and the right front pillar are fixed between the front beam and the base panel hung between the front ends of the left side panel and the right side panel, and the rear pillar is fixed between the rear beam and the base panel hung between the rear ends of the left side panel and the right side panel. Therefore, the front beam and the rear beam are prevented from being distorted or bent, and thus mechanical strength of the entire housing is enhanced.

Abstract: In an electronics system, an adjustable airflow guide assembly and methods of deploying it facilitate dissipating heat. The assembly includes an extendable plate having a first coupling capable of rotatably attaching the extendable plate to a chassis, a link, including a second coupling, capable of translatably attaching the link to the chassis, and a third coupling capable of rotatably attaching the link to the extendable plate. The extendable plate presents a guide to deflect airflow and is capable of being swung into multiple different fixed positions to divert airflow within the electronics system toward portions of the chassis configured with electronic components that produce heat, such as board solid state drives (BSSDs).

Abstract: A system and method for controlling at least one environmental condition within at least one data storage library. The system may include at least one data storage library, the at least one data storage library having at least one component bay therein. The system may also include at least one adapter configured to fit within the at least one component bay, and/or at least one environmental conditioning device connected to the at least one adapter, wherein the at least one environmental conditioning device is configured to control at least one environmental condition within the at least one data storage library.

Abstract: Described herein is an integrated data center that provides for efficient cooling, as well as efficient wire routing.

Abstract: Provided is a refrigerator. The refrigerator may include a power supply unit configured to power the refrigerator using commercial power, a battery coupled to the power supply unit and configured to supply auxiliary power to the refrigerator, a power detection unit coupled to the power supply unit and the battery and configured to detect whether power is being supplied from the power supply unit, a driving unit to provide cold air, and a controller configured to control an operational mode of the driving unit based on the detection at the power detection unit. When the power supply unit is supplying power, the driving unit may be controlled to operate in a normal operation mode, and when the power supply unit is not supplying power, the driving unit may be controlled to operate in a power failure operation mode and to control the power to be supplied from the battery.

Abstract: A modular data center includes a fan which creates a cooling wind by taking in outside air, electronic devices which takes in the cooling wind and to discharge an exhaust flow, a flow passage which guides a part of the exhaust flow to upstream of the fan, an opening-closing portion which opens and closes the flow passage, and a control unit which adjusts the cooling wind by controlling the fan, and thereby to cool a temperature of the electronic device to a specified temperature. The control unit closes the opening-closing portion when a first assumed value of power consumed by the fan is smaller than a current value of the power. The control unit opens the opening-closing portion when a second assumed value of the power consumed by the fan is smaller than the current value of the power.

Abstract: Embodiment of the present invention generally relate to the field of thermal capacity management within data centers, and more specifically, to methods and systems which provide feedback based on thermal information associated with parts of a data center. In an embodiment, the present invention is a method comprising the steps of using temperature measurements and power meter readings to provide real-time capacity usage information in a given data center and to use that information to perform moves/adds/changes with a particular level of confidence.

Abstract: A thermal ducting system for electronic equipment in an electronic equipment enclosure is provided. The thermal ducting system includes a top duct, a bottom duct spaced apart from the top duct, a side duct extending from the top duct to the bottom duct and along an intake side of the electronic equipment, and at least one baffle positioned in the side duct.

Abstract: A rack system for mounting at least one data processing unit includes a shelf operable for moving from a position internally of the rack system to a position externally of the rack system. The shelf has an aperture and a fluid mover for moving fluid through the aperture in the shelf when the shelf is located in its external position.

Abstract: A switch cabinet arrangement which includes a switch cabinet (1) with an installation frame (2) accommodated therein, which delimits an accommodation space (3) for switch cabinet fixtures and which comprises a cooling air duct (5, 6, 7), wherein the installation frame (2) comprises two parallel separated vertical profiles (4) which establish a first attachment plane (a) for the switch cabinet fixtures and wherein the cooling air duct (5, 6, 7) comprises a partition (5) which extends between the vertical profiles (4) and a respective associated switch cabinet side wall (12), characterized in that the partition (5) comprises at least one perforation (6) to which at least one air supply channel (7) is fluidically connected, which leads cooling air introduced via the perforation (6) into the air supply channel (7) in the direction of the accommodation space (3).

Abstract: New data center heat removal systems and methods allow a combination of active and passive thermal processes for removing heat from and cooling air in data center environments. Systems and methods include a data center heat removal system including an adjustable thermal feed cold air intake system, a distribution system for cold and warm air including one or more hot aisles and one or more cold aisles, and a convection system to draw cool air through data center equipment using a naturally-occurring convection processes to expel hot air. Misters, cooling elements, and/or freezer boxes may further cool the intake of air. A controller is programmed to efficiently manage and control the climate (e.g., temperature, humidity, air flow, pressure, air quality, etc.) within a data center to minimize the use for energy for air distribution and cooling.

Abstract: Techniques for cooling a data center include circulating an airflow, to a warm air plenum of a first module, from rows of racks that support a heat-generating electronic devices; warming the airflow circulated through the racks; circulating the warmed airflow through a warm air inlet of the warm air plenum that is adjacent an open side of the racks and to a warmed air outlet adjacent a data center volume above the racks; circulating the airflow, with a fan positioned in a second module positioned in the data center volume above the racks, through at least one cooling module to cool the warmed airflow, and into a human-occupiable workspace of the data center adjacent the racks; and diverting the warmed airflow with an airflow partition mounted in the data center volume above the racks and adjusted to interrupt the warmed airflow between the warmed air plenum and the human-occupiable workspace.

Abstract: An integrated power rack for use in a data center is provided. The integrated power rack includes a top, a base, a first side and a second side extending between the base and the top, a back member extending between the top, the base, the first side, and the second side, a divider extending from the top to the base, the divider positioned between the first side and the second side, a revenue sub-compartment defined between the first side and the divider, the revenue sub-compartment configured to receive a plurality of revenue producing devices, and a power sub-compartment defined between the second side and the divider, the power sub-compartment housing power equipment that is configured to provide direct-current (DC) power to the revenue sub-compartment.

Abstract: A housing structure includes an exterior cover having an opening through which an interior of the exterior cover communicates with an exterior of the exterior cover, an interior cover disposed inside the exterior cover and facing the exterior cover with a clearance secured therebetween, an inward projection projecting from the exterior cover to the interior cover, and an outward projection projecting from the interior cover to the exterior cover. The inward projection and the outward projection define an airflow passage in the clearance between the exterior cover and the interior cover, and the airflow passage includes multiple bent portions. The outward projection is greater in width than the inward projection in an airflow direction toward the opening, and the airflow direction perpendicular to a direction in which the interior cover faces the exterior cover.

Abstract: A rack device includes a housing at which an electronic device and an air conditioner are installed; a partition plate that divides a space in the housing into a first space in which the electronic device is disposed and a second space in which the air conditioner is disposed; and a shielding member that divides the second space into a space in which an outlet of the air conditioner is disposed and which is coupled to a suction side of the electronic device in the first space and a space in which an inlet of the air conditioner is disposed and which is coupled to a discharge side of the electronic device in the first space.

Abstract: A fan device mounting structure is provided, which is capable of sufficiently suppressing transmission of vibrations in X, Y, and Z directions generated from a fan device, that is, all translational-direction vibrations and all axial-rotation-direction vibrations, to a chassis in which the fan device is mounted. The fan device mounting structure includes: a fan device 1; a chassis 4 in which the fan device 1 is mounted; and at least a pair of flat springs 2, each of which has its one end attached to the fan device 1 and extending outwards from the fan device 1 and bending and has the other end attached to outside a fan device located area, wherein both opposite faces of the fan device 1 facing each other are supported by the respective flat springs 2 and attached to the chassis 4 at positions separate from each other.

Abstract: A method is provided for containing cold air in a corridor created on the side of a computer cabinet. The method includes providing a base mountable on the computer cabinet, and providing a panel fastened to the base and moveable with respect to the base, the panel being suitable for separating the cold air in the corridor below the panel from the hot air above the panel.

Abstract: A homogeneous EMI shielded vent panel is provided. The vent panel has an interior porous section and an exterior frame for attachment to an opening of an electronic enclosure. The vent panel can be fabricated using selective laser sintering technology to avoid the use of multiple parts and components which can generate harmful foreign object debris during fabrication and mounting of the vent panel.

Abstract: There is disclosed a digital signage including a display panel, a housing having the display panel arranged in a front surface, the housing comprising an inlet formed in a lower portion of a lateral surface and an outlet formed in an upper portion of a back surface or a top surface, a fan configured to suck air into the housing via the inlet and to blow the air exhausting via the outlet after penetrating a back surface of the display, a pre-filter mounted adjacent to the inlet, the pre-filter comprising a plurality of mesh holes, and a membrane filter configured to penetrate the air having penetrated the pre-filter there through and to filter moisture and foreign substances, such that may have a slim design and exhaust the heat generated from a display panel and a driving circuit board effectively.

Abstract: A system and a method for forming the system. The system includes a cooling conduit and rack containers stacked in a first direction parallel to a floor. Each rack unit includes at least one heat generating device configured to generate heat while in operation. Each rack container is equipped with wheels positioned on a supporting structure to enable the wheels to move along the supporting structure in a second direction which enables adjacent rack containers to move closer to or further from each other. The second direction is parallel to the floor and perpendicular to the first direction. The supporting structure is on the floor and oriented in the second direction. The cooling conduit is secured on a top surface of each rack container to allow a cooling fluid to flow into each rack container and be heated by absorbing heat from the at least one heat generating device.

Abstract: A synthetic jet assembly includes a synthetic jet having a cavity and an opening formed therein. The synthetic jet assembly also includes an actuator element coupled to a second surface of the body to selectively cause displacement of the second surface, and a control unit electrically coupled to the actuator element. The control unit is configured to transmit a multi-frequency drive signal to the actuator element, the multi-frequency drive signal comprising a cooling frequency component and an acoustic frequency component superimposed on the cooling frequency component. The cooling frequency component causes a cooling jet to eject from the opening of the body. The acoustic frequency component produces a desired audible output.

Abstract: An electronic device includes an accommodating space, a fan, a cover, and a three dimensional dust extraction mesh. The fan is disposed in the accommodating space. The fan includes a first fixing portion. The cover detachably covers the accommodating space, and the cover includes a second fixing portion in accommodating space. The three dimensional dust extraction mesh includes a body, a third fixing portion, and a fourth fixing portion, and the third fixing portion and the fourth fixing portion are located at periphery of the body. The third fixing portion of the three dimensional dust extraction mesh cooperates with the first fixing portion of the fan, and the fourth fixing portion of the three dimensional dust extraction mesh cooperates with the second fixing portion of the cover to detachably fix the three dimensional dust extraction mesh between the cover and the fan.

Abstract: A method for managing a fan system in an information handling system (IHS) is disclosed. The method includes providing the fan system comprising a first fan and at least one subsequent fan, wherein the first fan is associated with a first fan speed, the at least one subsequent fan is associated with the at least one subsequent fan speed and the fan system is associated with a system fan speed. The method also includes generating a system fan speed request, adjusting the first fan speed to avoid a critical range when the system fan speed request falls within the critical range, and adjusting the system fan speed to meet the system fan speed request.

Abstract: A fan plate system can include a fan plate and may or may not include the fan. The fan plate can include one or more surfaces. The fan plate can also include a grill configured to allow air to flow into or from a fan through the grill. The one or more surfaces can be configured to connect to a first end of an outer housing of the fan. The one or more surfaces can also provide a gap between the first end of the fan outer housing and the grill when the fan outer housing is connected to the fan plate. In some embodiments, an electronic device can include a fan plate system.

Abstract: A cleaning mechanism includes: an airflow control chamber for receiving exhaust air from a cooling fan; a cleaning outlet for outputting the exhaust air to be used for cleaning; a flexible pipe having one end in communication with the cleaning outlet and one free end directable by a user for cleaning; and an activation component for activating a cleaning operation in which the exhaust air is directed through the flexible pipe. The activation component may include a switching mechanism for switching the direction of airflow in the airflow control chamber between the cleaning outlet and an exit out of the computer. The cleaning mechanism may include an airflow accelerator for increasing the airflow to the cleaning outlet.

Abstract: A multi-floor data center, comprising in one implementation, a plurality of floors; a first set of server racks disposed about a first vertical center axis on each floor, the first set of server racks formed in a substantially closed shape, with a substantially vertical open center comprising a first airflow plenum at least for air flow; a first opening in each of the floors, with the first opening aligned with the substantially vertical first airflow plenum on it respective floor, wherein the substantially vertical first airflow plenums on the floors are aligned for communication through the first openings in the floors; outer wall; a roof with a roof opening therein.

Abstract: A data center includes a hot stack for exhausting heated air from the data center. As air flows across computing assets operating in the data center, the air absorbs heat generated by the computing assets. The temperature difference between the heated air and air outside the data center, the height of the hot stack, and the area of the hot stack causes the heated air to flow through the hot stack and outside of the data center. This air flow may be used to decrease the pressure of a portion of the data center, causing air to flow from a higher pressure portion of the data center to the depressurized portion of the data center.

Abstract: A container data center includes a container, a row of racks installed in the container, an air conditioner, and a heat insulation apparatus. A cool channel and a heat channel are defined at two opposite sides of the row of racks. The removable heat insulation apparatus divides the cool channel into a first space and a small second next to the racks, and maintains the cooled air in the second space. Cooled air from the air conditioner is fed into the second space air conditioner, flows through the racks to remove heat generated, and enters the heat channel.

Abstract: In one embodiment, a filter cleaning system and method pertain to, during a filter cleaning operation, reversing a flow direction of an inlet fan associated with a filter of the electrical device, the inlet fan being adapted to force air into a housing of the electrical device during normal operation of the electrical device, and reversing a flow direction of an outlet fan adapted to draw air out from the electrical device housing during normal operation of the electrical device so as to increase pressure within the electrical device housing during the filter cleaning operation, wherein the combined action of the reversed inlet fan and the reversed outlet fan purges particulate matter from the filter.

Abstract: Flow measurement systems and methods are provided. A flow measurement system can include at least one heat-producing computing device having at least one fluid inlet and one fluid outlet. The system can further include at least one inlet fluid temperature sensor and at least one outlet fluid temperature sensor. At least one current sensor measuring the current supplied to at least a portion of the at least one heat-producing computing device can also be included with the system. The system can also include at least one calculating device adapted to calculate the inlet fluid flow rate based at least in part upon the sensed inlet fluid temperature, the sensed outlet fluid temperature, and the sensed current flow.

Abstract: An inlet duct system includes a duct body having a bottom wall and two side walls having at least one opening. An adjustable internal baffle is secured to the duct body such that the internal baffle can be positioned in multiple locations within an internal cavity defined by the duct body, inhibiting the flow of air between a front portion and a rear portion of the internal cavity. A first side duct is removably attached to the duct body and forms an air flow chamber that receives a fluid from an opening in one of the side walls and delivers the fluid above the duct body. A first side baffle is positioned within the air flow chamber, adjacent the internal baffle, inhibiting the flow of air between a front portion and a rear portion of the air flow chamber.

Abstract: In order to arrange an air passage device for the admission and purification of air, in particular ambient air, into the interior of a control cabinet or computer housing in such a way that the device can be used also in an environment which is subject to an increased degree of pollution, a first purifying includes a centrifugal separator.

Abstract: A heating element housing device (7) comprises a heat exchange device (6) for cooling inside a cabinet (1) by exchanging heat between internal air (8) and external air (9). An exterior fan (22a) is disposed at a bottom portion of the cabinet (1) and an interior fan (21a) is disposed at an upper portion of the cabinet (1). A case (10) houses a heat exchanger (2). The heat exchanger (2) is provided with an internal air intake port (14), an internal air outlet port (15) and an external air intake port (16). An external air outlet port (11) is provided on a side of the case (10) opposite to a cabinet door (3) for blowing out the external air (9). The exterior fan (22a) and the interior fan (21a) are both centrifugal-type fans.