Patent Publication Number: US-2011059686-A1

Title: Ventilator

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of Korean Patent Application No. 2009-0084112, filed on Sep. 7, 2009 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. 
     BACKGROUND 
     1. Field 
     Embodiments relate to a ventilator that performs ventilation through total heat exchange between indoor air and outdoor air. 
     2. Description of the Related Art 
     Generally, a ventilator discharges indoor air out of a room and suctions fresh outdoor air into the room to ventilate the room. Also, the ventilator performs heat exchange between the suctioned outdoor air and the discharged indoor air to reduce the change of room temperature due to the introduction of the outdoor air. 
     The ventilator includes a case having partitioned interior spaces to prevent suctioned indoor air and outdoor air from being mixed, a total heat exchanger provided in the case to perform heat exchange between the indoor air and the outdoor air, and a plurality of blowers provided at the case to forcibly blow air. 
     During the operation of the blowers, indoor air is discharged out of the room via the total heat exchanger, and outdoor air is heat-exchanged with indoor air by the total heat exchanger and then discharged into the room. 
     Since the outdoor air suctioned into the room is heat-exchanged with indoor air while passing through the total heat exchanger, the change of room temperature is reduced and thus cooling and heating costs are reduced as compared with when outdoor air is directly supplied into the room. 
     Meanwhile, the ventilator may suction outdoor air into the case or discharge suctioned indoor air out of the room using a single supply and exhaust air duct. 
     In this case, the supply and exhaust air duct is divided into a supply air region to suction outdoor air and an exhaust air region to discharge indoor air by a partition disposed in the supply and exhaust air duct. The partition may correctly divide the supply air region and the exhaust air region of the supply and exhaust air duct to prevent deterioration of energy efficiency of the ventilator caused due to the mixture of outdoor air and indoor air. 
     SUMMARY 
     Therefore, it is an aspect to provide a ventilator including an improved partition disposed in a supply and exhaust air duct. 
     It is another aspect to provide a ventilator that prevents indoor air and outdoor air from being mixed in the supply and exhaust air duct. 
     Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the embodiments. 
     In accordance with one aspect, a ventilator includes a case having a supply air port to introduce outdoor air and an exhaust air port to discharge indoor air, a supply and exhaust air duct to communicate with the supply air port and the exhaust air port, and a partition disposed in the supply and exhaust air duct to divide the supply and exhaust air duct into a supply air region to communicate with the supply air port and an exhaust air region to communicate with the exhaust air port, the partition having a protrusion protruding outward from at least one end of the supply and exhaust air duct. 
     The partition may have protrusions protruding outward from opposite ends of the supply and exhaust air duct. 
     The partition may have a foam member attached to a surface thereof. 
     The supply air port and the exhaust air port may communicate with each other at one end of the supply and exhaust air duct. 
     The ventilator may further include a hood cap connected to the supply and exhaust air duct at an end opposite to the end where the supply air port and the exhaust air port communicate with each other, and the hood cap may be provided with a hood cap partition to divide the hood cap into a supply air region to communicate with the supply air region of the supply and exhaust air duct and an exhaust air region to communicate with the exhaust air region of the supply and exhaust air duct. 
     One of the protrusions may contact an inside of the supply air port and/or an inside of the exhaust air port, and the other protrusion may contact the hood cap partition. 
     The protrusions of the partition may be bent. 
     The foam member may be attached to at least one surface of the partition contacting the supply air port and the hood cap partition. 
     One of the protrusions may be disposed in a first groove formed between the supply air port and the exhaust air port, and the other protrusion may be disposed in a second groove formed at the hood cap partition. 
     The case may have an indoor supply air port to introduce indoor air and an indoor exhaust air port to discharge outdoor air. 
     The ventilator may further include a supply air unit to guide the outdoor air introduced through the supply air port into a room, an exhaust air unit to guide the indoor air introduced through the indoor supply air port out of the room, and a total heat exchanger to perform total heat exchange between the outdoor air and the indoor air guided by the supply air unit and the exhaust air unit. 
     In accordance with another aspect, a ventilator includes a case having an outdoor supply air port to introduce outdoor air, an indoor supply air port to introduce indoor air, an indoor exhaust air port to discharge indoor air, and an outdoor exhaust air port to discharge outdoor air, a supply air unit to guide the outdoor air introduced through the outdoor supply air port to the indoor exhaust air port, an exhaust air unit to guide the indoor air introduced through the indoor supply air port to the outdoor exhaust air port, a total heat exchanger to perform total heat exchange between the outdoor air and the indoor air guided by the supply air unit and the exhaust air unit, a supply and exhaust air duct to communicate with the outdoor supply air port and the outdoor exhaust air port, a partition disposed in the supply and exhaust air duct to divide an interior of the supply and exhaust air duct into a supply air region to communicate with the outdoor supply air port and an exhaust air region to communicate with the outdoor exhaust air port, a hood cap connected to the supply and exhaust air duct such that the hood cap communicates with the supply air region and the exhaust air region, the partition having protrusions protruding outward from opposite ends of the supply and exhaust air duct, the protrusions being bent to contact the outdoor supply air port and the hood cap. 
     The partition may have a foam member attached to a surface thereof. 
     In accordance with a further aspect, a ventilator includes a case having an outdoor supply air port to introduce outdoor air and an outdoor exhaust air port to discharge indoor air, a supply and exhaust air duct to communicate with the outdoor supply air port and the outdoor exhaust air port, the supply and exhaust air duct being divided into a first supply air region to communicate with the outdoor supply air port and a first exhaust air region to communicate with the outdoor exhaust air port by a first partition disposed in the supply and exhaust air duct, and a hood cap connected to the supply and exhaust air duct, the hood cap being disposed outdoors, the hood cap being divided into a second supply air region to communicate with the first supply air region and a second exhaust air region to communicate with the first exhaust air region by a second partition, the first partition having protrusions protruding outward from opposite ends of the supply and exhaust air duct to contact the outdoor supply air port and the second partition. 
     The protrusions of the first partition may be bent. 
     The protrusions of the first partition may contact an inside of the outdoor supply air port and a bottom of the second partition. 
     The first partition may have a foam member attached to a surface thereof. 
     The foam member may be attached to at least one surface of the first partition contacting the outdoor supply air port and the second partition. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and/or other aspects will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which: 
         FIG. 1  is a perspective view illustrating a ventilator; 
         FIG. 2  is an exploded perspective view of the ventilator with the front opened illustrating the interior structure of the ventilator; 
         FIG. 3  is a front view of the ventilator with the front opened illustrating the interior structure of the ventilator; 
         FIG. 4  is an exploded perspective view illustrating the rear of a ventilator according to an embodiment; 
         FIG. 5  is a side sectional view of the ventilator of  FIG. 4 ; 
         FIG. 6  is a perspective view illustrating a supply and exhaust air duct of the ventilator shown in  FIG. 5 ; 
         FIG. 7  is a partially enlarged sectional view of the supply and exhaust air duct of  FIG. 6 ; 
         FIG. 8  is a side sectional view illustrating a ventilator according to another embodiment; 
         FIG. 9  is a perspective view illustrating a supply and exhaust air duct shown in  FIG. 8 ; 
         FIG. 10  is a partially enlarged sectional view of the supply and exhaust air duct of  FIG. 8 ; 
         FIG. 11  is an exploded perspective view illustrating the rear of a ventilator according to a further embodiment; 
         FIG. 12  is a side sectional view of the ventilator shown in  FIG. 11 ; and 
         FIG. 13  is a partially enlarged sectional view of the ventilator shown in  FIG. 12 . 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. 
       FIG. 1  is a perspective view illustrating a ventilator,  FIG. 2  is an exploded perspective view of the ventilator with the front opened illustrating the interior structure of the ventilator, and  FIG. 3  is a front view of the ventilator with the front opened illustrating the interior structure of the ventilator.  FIG. 4  may also be referred to for the convenience of description. 
     As shown in  FIGS. 1 to 4 , the ventilator includes a case  10  defining the external appearance of the ventilator, a supply air unit  40  provided in the case  10  to guide outdoor air into a room, an exhaust air unit  50  provided in the case  10  to guide indoor air out of the room, and total heat exchangers  30  to perform heat exchange between indoor air and outdoor air in the case  10 . 
     The case  10  has indoor supply air ports  11  to suction indoor air and indoor exhaust air ports  13  to discharge outdoor air into the room. As shown in the drawings, the indoor supply air ports  11  are formed at the lower parts of opposite sides of the case  10 , and the indoor exhaust air ports  13  are formed at the front part of the top of the case  10  while being divided into two sections. 
     Also, the case  10  has an outdoor supply air port  15  to suction outdoor air and an outdoor exhaust air port  17  to discharge indoor air out of the room. The outdoor supply air port  15  and the outdoor exhaust air port  17  are formed at the rear of the case  10  such that the outdoor supply air port  15  and the outdoor exhaust air port  17  communicate with each other via a supply and exhaust air duct  60 , which will be described hereinafter. 
     The outdoor supply air port  15  and the outdoor exhaust air port  17 , communicating with each other via the supply and exhaust air duct  60 , are provided within a range defined by the diameter of the supply and exhaust air duct  60  such that the outdoor supply air port  15  and the outdoor exhaust air port  17  communicate with each other via only a single supply and exhaust air duct  60  as shown in the drawings. 
     In the case  10  is also provided an indoor supply air duct  21 , which is located at the rears of the total heat exchangers  30  such that outdoor air suctioned through the outdoor supply air port  15  reaches the total heat exchangers  30 . The outdoor air suctioned through the indoor supply air duct  21  passes through the total heat exchangers  30 , and is discharged into the room by the supply air unit  40 . 
     For example, when outdoor air suctioned through the indoor supply air duct  21  passes through a total heat exchanger  30   a  provided at the right side of the case  10 , the outdoor air is introduced through a space S 1  defined by right upper sides of the right-side total heat exchanger  30   a , and is discharged through a space S 3  defined by left lower sides of the total heat exchanger  30   a  where the supply air unit  40  is provided. 
     Also, when outdoor air suctioned through the indoor supply air duct  21  passes through a total heat exchanger  30   b  provided at the left side of the case  10 , the outdoor air is introduced through a space S 1  defined by left upper sides of the left-side total heat exchanger  30   b , and is discharged through a space S 3  defined by right lower sides of the total heat exchanger  30   b  where the supply air unit  40  is provided. 
     To this end, the indoor supply air duct  21  is constructed so as to communicate with the space S 1  defined by the right upper sides of the total heat exchanger  30   a  or the left upper sides of the total heat exchanger  30   b  such that outdoor air is introduced into the space S 1 . 
     The supply air unit  40  serves to introduce outdoor air suctioned through the outdoor supply air port  15  and totally heat-exchanged by the total heat exchangers  30   a  and  30   b  into the room. The supply air unit  40  includes a supply air fan case  41  disposed at the middle of the case  10  such that the supply air fan case  41  is located at the front lower part of the case  10 , a supply air fan  43  provided in the supply air fan case  41 , and a drive motor (not shown) to drive the supply air fan  43 . 
     The supply air fan case  41  has an inlet port to introduce outdoor air, totally heat-exchanged and discharged into the space S 3  defined by the left lower sides of the total heat exchanger  30   a  or the right lower sides of the total heat exchanger  30   b  during the operation of the supply air fan  43 , into the supply air fan case  41  and an outlet port to discharge the outdoor air, introduced through the inlet port, to the top. 
     The outlet port of the supply air fan case  41  is connected to an indoor exhaust air duct  23 . The indoor exhaust air duct  23  communicates with the indoor exhaust air ports  13  formed at the front part of the top of the case  10  while being divided into two sections. That is, as shown in the drawings, the indoor exhaust air duct  23  is configured in the shape of a fan widening upward such that the indoor exhaust air duct  23  communicates with the indoor exhaust air ports  13  formed at the front part of the top of the case  10  while being divided into two sections. 
     The exhaust air unit  50  serves to discharge indoor air suctioned through the indoor supply air ports  11  and totally heat-exchanged by the total heat exchangers  30   a  and  30   b  out of the room. The exhaust air unit  50  includes an exhaust air fan case  51  disposed at the middle of the case  10  such that the exhaust air fan case  51  is located at the rear upper part of the case  10 , an exhaust air fan  53  provided in the exhaust air fan case  51 , and a drive motor (not shown) to drive the exhaust air fan  53 . 
     The exhaust air fan case  51  has an inlet port to introduce indoor air, discharged into a space S 4  defined by left upper sides of the total heat exchanger  30   a  or right upper sides of the total heat exchanger  30   b  during the operation of the exhaust air fan  53 , into the exhaust air fan case  51  and an outlet port to discharge the indoor air, introduced through the inlet port, to the rear. The outlet port of the exhaust air fan case  51  communicates with the supply and exhaust air duct  60  connected to the rear of the case  10 . 
     That is, indoor air is introduced into a space S 2  defined by right lower sides of the total heat exchanger  30   a  or left lower sides of the total heat exchanger  30   b , and is discharged into the space S 4  defined by left upper sides of the total heat exchanger  30   a  or right upper sides of the total heat exchanger  30   b  where the exhaust air unit  50  is provided, during the operation of the exhaust air fan  53 . 
     In the case  10  is provided a control box  37 , which is located at the right lower end of the case  10 . The control box  37  controls operational conditions of the ventilator. That is, the control box  37  controls a power supply to turn the ventilator on/off, and controls rotational frequencies of the supply air fan  43  and the exhaust air fan  53  to adjust airflow. 
     Each of the total heat exchangers  30  is constructed in a structure in which a spacer and a liner are sequentially stacked. The spacer and the liner each have a plurality of channels through which air is supplied and exhausted. The channels of the spacer are at right angles to the channels of the liner. 
     That is, indoor air and outdoor air, having different temperatures, flow along different channels in the respective total heat exchangers  30  such that total heat exchange is performed between the indoor air and the outdoor air. 
     Also, each of the total heat exchangers  30  is supported at the case via a bracket  35  mounted at the inner bottom of the case  10 . The bracket  35  serves to support load of a corresponding one of the total heat exchangers  30  and, in addition, to guide the corresponding total heat exchanger  30  during the mounting or removal of the corresponding total heat exchanger  30 . 
     At the front of each of the total heat exchangers  30  is mounted a grip  33  to easily move the corresponding total heat exchanger  30  back and forth during the mounting or removal of the corresponding total heat exchanger  30 . Outside each of the total heat exchangers  30  a pre-filter  31  is detachably mounted to remove dust or foreign matter during total heat exchange between indoor air and outdoor air. 
     At the rear of the case  10  is a flange  25  to which the supply and exhaust air duct  60  are mounted such that the outdoor supply air port  15  and the outdoor exhaust air port  17  communicate with the supply and exhaust air duct  60 . The flange  25  is formed in a ring shape. The flange  25  has a diameter sufficient for the outdoor supply air port  15  and the outdoor exhaust air port  17  to be disposed within a range of the diameter of the supply and exhaust air duct  60  connected to the flange  25 . 
     As described above, the supply and exhaust air duct  60  is connected to the flange such that the supply and exhaust air duct  60  communicates with the outdoor supply air port  15  and the outdoor exhaust air port  17 . The supply and exhaust air duct  60  has a diameter sufficient to include the outdoor supply air port  15  and the outdoor exhaust air port  17 . 
     One end of the supply and exhaust air duct  60  is connected to the flange  25  mounted at the rear of the case  10 , and the other end of the supply and exhaust air duct  60  is connected to a hood cap  70  disposed outdoors. That is, the supply and exhaust air duct  60  extends through a wall of the room to connect the indoor case  10  and the outdoor hood cap  70 . 
     In this embodiment, the outdoor supply air port  15  and the outdoor exhaust air port  17  communicate with a single supply and exhaust air duct  60 . Therefore, it is sufficient to form a single hole in the wall of the room, thereby reducing installation time of the ventilator. 
       FIG. 4  is an exploded perspective view illustrating the rear of a ventilator according to an embodiment,  FIG. 5  is a side sectional view of the ventilator of  FIG. 4 ,  FIG. 6  is a perspective view illustrating a supply and exhaust air duct of the ventilator shown in  FIG. 5 , and  FIG. 7  is a partially enlarged sectional view of the supply and exhaust air duct of  FIG. 6 . 
     As shown in  FIGS. 4 to 7 , a partition  65  is disposed in the supply and exhaust air duct  60  to divide the interior of the supply and exhaust air duct  60  into a supply air region  61  to suction outdoor air and an exhaust air region  63  to discharge indoor air. 
     The partition  65  may be a thin flat panel. The partition  65  may have a protrusion protruding outward from at least one end of the supply and exhaust air duct  60 . In this embodiment, protrusions  66   a  and  66   b  protrude outward from opposite ends of the supply and exhaust air duct  60 . 
     The protrusion  66   a  of the partition  65  may contact the outdoor supply air port  15  and/or the outdoor exhaust air port  17  of the case  10 . In this embodiment, the protrusion  66   a  contacts the outdoor supply air port  15 . The protrusion  66   b  contacts a partition of the hood cap  70  to divide the interior of the hood cap  70  into a supply air region  71  and an exhaust air region  73 . 
     Therefore, the protrusions  66   a  and  66   b  of the partition  65  contact the outdoor supply air port  15  of the case  10  and the partition  75  of the hood cap  70 , with the result that the supply air region  61  and the exhaust air region  63  of the supply and exhaust air duct  60  are correctly divided during the insertion of the partition  65  into the supply and exhaust air duct  60 . 
     Foam members  67  are attached to opposite surfaces of the partition  65 . By the provision of the foam members  67 , the protrusions  66   a  and  66   b  of the partition  65  further prevent leakage of outdoor air and indoor air between the partition  65  and the inside of the outdoor supply air port  15  and between the partition  65  and the bottom of the partition  75  of the hood cap  70 . 
     A foam member  67  may be attached to at least one surface of the partition  65  contacting the outdoor supply air port  15  and the partition  75  of the hood cap  70 . 
     Therefore, the partition  65 , dividing the interior of the supply and exhaust air duct  60  into the supply air region  61  and the exhaust air region  63 , prevents leakage of outdoor air and indoor air flowing along the supply and exhaust air duct  60  and thus prevents mixing of the outdoor air and the indoor air, thereby preventing deterioration of energy efficiency of the ventilator. 
       FIG. 8  is a side sectional view illustrating a ventilator according to another embodiment,  FIG. 9  is a perspective view illustrating a supply and exhaust air duct shown in  FIG. 8 , and  FIG. 10  is a partially enlarged sectional view of the supply and exhaust air duct of  FIG. 8 . 
     A detailed description of the same components of this embodiment as the previous embodiment is omitted. 
     As shown in  FIGS. 8 to 10 , a partition  165  is disposed in the supply and exhaust air duct  60  to divide the interior of the supply and exhaust air duct  60  into a supply air region  61  to suction outdoor air and an exhaust air region  63  to discharge indoor air. 
     The partition  165  has protrusions  166   a  and  166   b  protruding outward from opposite ends of the supply and exhaust air duct  60 . The protrusions  166   a  and  166   b  are bent downward to some extent. 
     The protrusion  166   a  contacts the outdoor supply air port  15  and/or the outdoor exhaust air port  17  of the case  10 . That is, the bent portion of the protrusion  166   a  of the partition  165  directly contacts the inside of the outdoor supply air port  15  to prevent leakage of outdoor air and indoor air between the partition  165  and the outdoor supply air port  15 . 
     The protrusion  166   b  of the partition  165  directly contacts the partition  75  of the hood cap  70 , such that the bend portion of the protrusion  166  supports the bottom of the partition  75 , to prevent leakage of outdoor air and indoor air between the partition  165  of the supply and exhaust air duct  60  and the partition  75  of the hood cap  70 . 
     Therefore, the bent protrusions  166   a  and  166   b  of the partition  165  correctly divide the supply air region  61  and the exhaust air region  63  of the supply and exhaust air duct  60  in contact with the inside of the outdoor supply air port  15  and the bottom of the partition  75  of the hood cap  70 , thereby preventing leakage of outdoor air and indoor air between the partition  165  and the outdoor supply air port  15  and between the partition  165  and the partition  75  of the hood cap  70 . 
     Foam members  167  are attached to opposite surfaces of the partition  165 . By the provision of the foam members  167 , the protrusions  166   a  and  166   b  of the partition  165  further prevent leakage of outdoor air and indoor air between the partition  165  and the inside of the outdoor supply air port  15  and between the partition  165  and the bottom of the partition  75  of the hood cap  70 . 
     A foam member  167  may be attached to at least one surface of the partition  165  contacting the outdoor supply air port  15  and the partition  75  of the hood cap  70 . 
     Although not shown, the protrusions  166   a  and  166   b  of the partition  165  may be bent upward to some extent. In this case, the protrusion  166   a  directly contacts the inside of the outdoor exhaust air port  17  of the case  10 , and the protrusion  166   b  directly contacts the top of the partition  75  of the hood cap  70 . 
       FIG. 11  is an exploded perspective view illustrating the rear of a ventilator according to a further embodiment,  FIG. 12  is a side sectional view of the ventilator shown in  FIG. 11 , and  FIG. 13  is a partially enlarged sectional view of the ventilator shown in  FIG. 12 . 
     As shown in  FIGS. 11 to 13 , a partition  265  is disposed in the supply and exhaust air duct  60  to divide the interior of the supply and exhaust air duct  60  into a supply air region  61  to suction outdoor air and an exhaust air region  63  to discharge indoor air. The partition  265  has protrusions  266   a  and  266   b  protruding outward from opposite ends of the supply and exhaust air duct  60 . 
     The protrusion  266   a  is fitted in a first groove  16  formed between the outdoor supply air port  15  and the outdoor exhaust air port  17  of the case  10 . The protrusion  266   b  is fitted in a second groove  76  formed at the partition to divide the interior of the hood cap  70  into the supply air region  71  and the exhaust air region  73 . 
     Therefore, the partition  265  correctly divides the supply air region  61  and the exhaust air region  63  of the supply and exhaust air duct  60  during the insertion of the partition  265  into the supply and exhaust air duct  60 . 
     Foam members  267  are attached to opposite surfaces of the partition  265 . By the provision of the foam members  267 , the protrusions  266   a  and  266   b  of the partition  265  further prevent leakage of outdoor air and indoor air between the outdoor supply air port  15  and the outdoor exhaust air port  17  or between the partition  265  and the supply air region  71  of the hood cap  70  and between the partition  265  and the exhaust air region  73  of the hood cap  70 . 
     Hereinafter, the operation of the ventilator with the above-stated construction will be described in detail with reference to the drawings. 
     First, power is supplied to the control box  37  of the ventilator to simultaneously operate the supply air unit  40  and the exhaust air unit  50 . 
     During the operation of the supply air unit  40 , outdoor air is introduced into the case  10  through the outdoor supply air port  15  of the case  10  via the hood cap  70  and the supply air region  61  of the supply and exhaust air duct  60 . The outdoor air is guided into the spaces S 1  defined by the total heat exchangers  30  through the indoor supply air duct  21 , passes through the total heat exchangers  30 , and is introduced into the supply air fan case  41  of the supply air unit  40 . The outdoor air flows along the indoor supply air duct  21 , and is discharged into a room through the indoor exhaust air ports  13  of the case  10 . 
     At the same time, during the operation of the exhaust air unit  50 , indoor air is introduced into the case  10  through the indoor supply air ports  11  of the case  10 . The indoor air, introduced into the spaces S 2  of the case  10 , passes through the total heat exchangers  30 , is guided into the spaces S 4  defined by the total heat exchangers  30 , and is introduced into the exhaust air fan case  51  of the exhaust air unit  50 . The indoor air is discharged out of the room through the outdoor exhaust air port  17  via the exhaust air region  63  of the supply and exhaust air duct  60  and the hood cap  70 . 
     Meanwhile, the interior of the supply and exhaust air duct  60  is divided into the supply air region  61  and the exhaust air region  63  by the partition  65 ;  165 ;  265  to prevent the outdoor air and the indoor air from being mixed during the flow of the outdoor air and the indoor air along the supply and exhaust air duct  60 . 
     The partition  65 ;  165 ;  265  has the protrusions  66   a  and  66   b ;  166   a  and  166   b ;  266   a  and  266   b  protruding outward from the opposite ends of the supply and exhaust air duct  60 . The protrusion  66   a ;  166   a ;  266   a  contacts the inside of the outdoor supply air port  15  of the case  10 , the inside of the outdoor exhaust air port  17  of the case  10 , or the first groove between the outdoor supply air port  15  and the outdoor exhaust air port  17 . The protrusion  66   b ;  166   b ;  266   b  contacts the partition  75  of the hood cap  70  or the second groove  76  of the partition  75 . 
     As a result, the partition  65 ;  165 ;  265  correctly divides the supply air region  61  and the exhaust air region  63  of the supply and exhaust air duct  60  during the insertion of the partition  65 ;  165 ;  265  into the supply and exhaust air duct  60 . 
     Also, the foam members  67 ;  167 ;  267  are attached to the surfaces of the partition  65 ;  165 ;  265 . In addition, the protrusions  166   a  and  166   b  of the partition  165  are bent to some extent. 
     Therefore, the partition  65 ;  165 ;  265  prevents leakage of outdoor air and indoor air in the supply and exhaust air duct  60  by the provision of the foam members  67 ;  167 ;  267  and the bent portions of the protrusions  166   a  and  166   b , thereby preventing deterioration of energy efficiency of the ventilator. 
     As is apparent from the above description, the partition protrudes outward from the opposite ends of the supply and exhaust air duct, and therefore, the partition correctly divides the supply air region and the exhaust air region of the supply and exhaust air duct during the insertion of the partition into the supply and exhaust air duct. 
     Also, the foam members are attached to the surfaces of the partition, and the protrusions of the partition are bent, thereby preventing leakage of outdoor air and indoor air in the supply and exhaust air duct and thus preventing deterioration of energy efficiency of the ventilator. 
     Although a few embodiments have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.