JP2020105900A - Ventilation system and method of manufacturing ventilation system - Google Patents

Abstract

To provide a ventilation system that can reduce heat flow in and out of windows and increase cooling and heating efficiency.SOLUTION: The ventilation system comprises an outer window 1, an inner window 2, and a ventilation port 4. The inner window 2 has a ventilation portion 3 that communicates with the inside and outside of the room. The ventilation port 4 is provided in an outer wall 23 to take in the outside air into the room, and has a communication passage 6 for guiding the air entering from the ventilation port 4 to an intermediate layer 5 between the outer window and the inner window.SELECTED DRAWING: Figure 1

Description

The present invention relates to a ventilation system including an outer window and an inner window, and a method for manufacturing the ventilation system.

The indoor environment of the building was controlled by air-conditioning equipment, but heat was often coming in and going out of the windows, and electricity costs were required, so an economically superior one was required.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a ventilation system capable of reducing heat entering and exiting from a window and improving cooling and heating efficiency, and a method of manufacturing the ventilation system.

In order to achieve the above object, the ventilation system according to the invention of claim 1 is provided with an outer window, an inner window and a ventilation opening, the inner window having a ventilation part communicating with the inside and outside of the room, and the ventilation opening, It is provided on the outer wall to take in the outside air into the room, and is characterized by having a communication passage for guiding the air entering from the ventilation port to the intermediate layer between the outer window and the inner window.

A ventilation system according to a second aspect of the present invention includes an outer window, an inner window, and a ventilation port, the inner window having a ventilation portion that communicates with the inside and outside of the room, and the ventilation port is provided on the outer wall and the indoor air is provided. Is discharged to the outside of the room, and is characterized by having a communication passage for guiding air in the intermediate layer between the outer window and the inner window to the ventilation port.

A method of manufacturing a ventilation system according to a third aspect of the present invention includes a step of attaching an inner window having a ventilation portion communicating with the inside and the outside of the existing outside window, and an existing ventilation hole communicating with the inside and outside of the outside window. And a step of providing a communication path leading to an intermediate layer between the inner windows.

In the ventilation system according to the first aspect of the invention, air flows from the outside to the inside of the room through the ventilation port provided in the outside wall, the communication passage, the intermediate layer between the outside window and the inside window, and the ventilation part of the inside window communicating with the inside and outside of the room. By recovering the heat transferred from the room to the room by the air flow in the middle layer and returning it to the room, the heat flowing out from the window can be reduced and the heating efficiency can be improved. Since there is no need for a ventilation section on the outer window, there is no fire prevention problem.

In the ventilation system according to the second aspect of the present invention, air flows from the room to the room through the ventilation port provided on the outer wall, the communication path, the intermediate layer between the outer window and the inner window, and the ventilation section communicating with the room inside and outside the room, By collecting the heat transferred from the outdoor to the indoor by the air flow of the middle layer and discarding it to the outdoor, the heat entering from the window can be reduced and the cooling efficiency can be improved. Since there is no need for a ventilation section on the outer window, there is no fire prevention problem.

In the method for manufacturing a ventilation system according to the third aspect of the present invention, an inner window having a ventilation portion that communicates with the inside and outside of the room is attached to the inside of the existing outside window, and the existing ventilation port communicating with the inside and the outside of the existing outside window By providing a communication path to the middle layer between the windows, air flows indoors and outdoors through the ventilation hole and the communication path and the ventilation part of the middle layer between the outer and inner windows and the inner window, and from winter to the outdoors The heat transferred to the room is recovered by the air flow in the middle layer and returned to the room.In the summer, the heat transferred to the room from the outside is recovered by the air flow in the middle layer and is discharged to the outside to reduce the heat flow in and out of the window. Cooling and heating efficiency can be improved. The outside window does not need to be refurbished, and by using the existing ventilation port, there is no need to open a new hole in the outer wall, and it is only necessary to renovate the proprietary part. It is easy to implement even in apartments such as condominiums that are necessary.

FIG. 5 is a sectional view taken along line AA of FIG. 4. FIG. 5 is a sectional view taken along line BB of FIG. 4. It is CC sectional drawing of FIG. It is an indoor side front view which shows 1st Embodiment of the ventilation system of this invention. It is a cross-sectional view showing a construction procedure of the ventilation system. It is a cross-sectional view which shows the construction procedure (continuation of FIG. 5-1) of the ventilation system. It is a sketch of a house provided with the same ventilation system. (A) is the front view seen from the indoor side of the ventilation port of the same ventilation system, (b) shows the state which removed the inspection lid and the lid of the pressure chamber. It is an indoor side front view of the fitting before repair. FIG. 9 is a cross-sectional view taken along line DD of FIG. 8. FIG. 9 is a sectional view taken along line EE of FIG. 8. FIG. 9 is a sectional view taken along line FF of FIG. 8. It is an indoor side front view which shows 2nd Embodiment of the ventilation system of this invention. It is GG sectional drawing of FIG. It is a cross-sectional view of the air blowing pipe provided in the middle layer of the ventilation system. It is an indoor side front view of the fitting before repair.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the ventilation system of the present invention. This ventilation system is applied to a window of an apartment house such as an apartment or a condominium, and as shown in FIGS. 1 to 3 and 8 to 11, an existing wall 33 having an outer window 1 and a ventilation port 4 is provided. The inner wall 32 is provided on the indoor side, the prospective dimension of the window opening is increased to the indoor side, and then the inner window 2 is attached to the indoor side of the window opening to form a double window, and the heat insulating material 7 is provided on the entire wall. It was put in and heat-insulated. 8 to 11 show the state before the repair.
In this house, as shown in FIG. 6, the air in the room is exhausted to the outside by the ventilation equipment 34 provided in the upper part of the bathroom, and the air (outside air) entering from the ventilation port 4 on the wall of each room is used as the outside window 1. A third-class ventilation system for ventilating the whole house is provided by introducing the air through the middle layer 5 between the inner windows 2 and then into the room.

As shown in FIGS. 1 and 2, the outer window 1 is provided with a frame 8 fixed to the skeleton opening, and an outer shoji 9 and an inner shoji 10 which are accommodated in the frame 8 so that they can be opened and closed in a pulling manner. The frame 8 includes an upper frame 11, a lower frame 12, and left and right vertical frames 13, 13. The frame 8 and the frames of the shoji 9 and 10 are made of aluminum.

As shown in FIGS. 1 and 2, the inner window 2 is drawn between the upper frame 15, the lower frame 16, the left and right vertical frames 17, 17 attached to the inner peripheral side surfaces of the four-round frame 14, and the upper and lower frames 15, 16. It is provided with an external shoji 18 and an internal shoji 19 which are stored so as to be openable and closable in a different manner. Frames of the frames 15, 16 and 17 and the shoji 18 and 19 are made of resin. The glass 20 of the shoji 18 and 19 is a double-layer glass.
As shown in FIGS. 1 and 4, a ventilation breath 21 is provided on the upper portion of the upper frame 15. The ventilation breath 21 is provided with a large number of ventilation holes 22 on the outdoor and indoor facing surfaces, and is provided with a ventilation portion 3 that communicates with the inside and outside of the room. A filter for preventing dust and pollen from entering is provided on the indoor side of the ventilation part 3.

As shown in FIGS. 3 and 4, a ventilation port 4 for taking in outside air into the room or discharging indoor air to the outside is provided at a position adjacent to the side of the upper part of the fitting of the outer wall 23. .. This ventilation port 4 utilizes the ventilation port 4 (see FIGS. 8 and 11) originally formed on the outer wall 23. As shown in FIG. 3, a circular hole 24 is formed through the outer wall 23. A hole 26 is provided outside the hole 24 and is covered with a hood 25. A fan 26 for sucking the outside air and discharging the air in the room is attached to the inside of the hole 24. A fan mounting space 27 is formed in the inner wall portion of the hole 24 on the indoor side, and an opening of the inner wall 32 on the indoor side of the hole 24 is covered with an inspection lid 28.

In the fan mounting space 27 on the outside of the inspection lid 28, as shown in FIG. 3, a pressure chamber 35 is provided so as to surround the fan 26. The pressure chamber 35 is made of a plate material having a heat insulating property such as Styrofoam and formed in a hexahedral box shape, and has heat insulating properties and airtightness. The wall 35a on the indoor side of the pressure chamber 35 can be attached and detached. By providing the pressure chamber 35 in this manner, the air sucked by the fan 26 is confined in the space inside the pressure chamber 35, thereby having the function of increasing the pressure.

As shown in FIG. 1, a communication passage 6 made of a resin round pipe is provided above the intermediate layer 5 between the outer window and the inner window. As shown in FIG. 2, one end of the communication passage 6 penetrates the frame 14 and communicates with the space 36 in the pressure chamber 35. The communication passage 6 is provided with a plurality of air inlets/outlets 29 at a lower portion thereof at intervals in the longitudinal direction. A rectifying plate 30 is provided so as to hang from the frame 14 at a position adjacent to the indoor side of the communication path 6.

Next, the construction procedure of this fitting will be described. First, as shown in FIG. 5A, the cover 31 attached to the indoor side of the existing ventilation port 4 is removed. Next, as shown in FIG. 5B, the inner wall 32 is provided on the indoor side of the existing wall 33 while leaving the fan mounting space 27, and the heat insulating material 7 is put into the entire wall. Further, the frame 14 is replaced with a frame having a long estimated size. Next, as shown in FIG. 5-2(c), the fan 26 and the pressure chamber 35 are attached to the hole 24 of the ventilation port 4 from the indoor side, and the communication passage 6 is formed so as to communicate with the space 36 in the pressure chamber 35. Install. After that, the inspection lid 28 is attached to the opening of the inner wall 32 of the ventilation port 4 on the indoor side to close the fan attachment space 27. Then, as shown in FIG. 5-2(d), the current plate 30 and the inner window 2 are attached.

In addition to providing the resin frames 15, 16 and 17 and the inner window 2 using the frame and the double-glazing 20, the ventilation system includes a ventilation port 4 and a communication passage 6 and an intermediate portion between the outer window and the inner window. The air flows indoors and outdoors through the layer 5 and the ventilation part 3 of the inner window 2, so that the heat transfer in the direction opposite to the air inflow direction is hindered and a further heat insulating effect is exerted.
Explaining the case of the winter season, by adjusting the negative pressure in the room by the ventilation equipment 34 in the upper part of the bathroom and turning the fan 26 of the ventilation port 4, the outside air is sucked into the pressure chamber 35 as shown in FIG. Since the pressure chamber 35 has airtightness, the pressure is increased, and the sucked outside air flows into the communication passage 6, and as shown in FIG. 1, faces downward or outside the air inlet/outlet port 29 provided in the lower portion of the communication passage 6. Blow out diagonally toward the window 1. The cold outside air blown out is lowered while being attracted to the flow along the inner surface of the glass 37 of the outer window 1 where the temperature is low and the force of the downward flow is strong. After that, the cold outside air flows to the bottom of the mid layer 5 and then folds back to be warmed by the heat in the room transmitted from the glass 20 of the inner window 2 and rises along the outside surface of the glass 20. The heat that escapes to is recovered by the flow of air. Further, when the window receives solar radiation, solar heat can be acquired while the air flows along the inner surface of the outer window 1 and the outer surface of the inner window 2 in the intermediate layer 5 as described above. The rising air flows into the room through the ventilation part 3 of the ventilation breath 21 provided on the upper part of the inner window 2. Even when the air passes through the ventilation part 3, the heat of the ventilation breath 21 and the upper frame 15 warmed by the heat of the room is recovered by the flow of the air. The presence of the flow regulating plate 30 prevents the rising air from flowing to the outside of the room and allows the air to efficiently flow into the room.
As described above, the air flows by bypassing the inside of the middle layer 5 along the outer window 1 and the inner window 2, whereby the heat transferred from the room to the outside is recovered by the flow of the air and returned to the room. Since there is almost no heat loss from the outside to the outside, very high heat insulation is obtained. In addition, since the outside air can be warmed and taken into the room, people in the room do not feel the cold wind and the heating efficiency is good. In addition, the arrow in the figure has shown the flow of air.

In the summer, the air pressure in the room is adjusted to a positive pressure by the ventilation equipment 34 at the upper part of the bathroom, and the fan 26 of the ventilation port 4 is reversed to allow air to flow from the room to the outdoors, contrary to the winter season. The air (inside air) flowing out from the ventilation part 3 of the inner window 2 into the intermediate layer 5 hits the straightening vane 30 and changes its flow downward, and the temperature of the air in the room is lower than that of the outside of the room. Flows down along the sides. After that, the air folds back at the lower part of the mid layer 5, and the heat of the glass 37 of the outer window 1 is transmitted, so that the air rises along the indoor side surface of the glass 37 of the outer window 1 and, during this period, enters the room from the outside through the glass 37. The incoming heat and solar heat are recovered by the flow of air. After that, air is discharged to the outside of the room through the communication passage 6 and the ventilation port 4. Then, as the air is released to the outside of the room, the heat recovered from the glass 37 or the like and the solar heat are discarded outside the room. In this way, by collecting the solar heat and the heat transmitted from the outdoor to the indoor by the flow of air and discarding it to the outdoor, it is possible to suppress the acquisition of solar heat, and from the outdoor side to the indoor side, which is the direction opposite to the air outflow direction. Since the heat transfer to the room is hindered, it exhibits an excellent heat insulating effect, keeping the room cool and suppressing the cooling load.

12 and 13 show a second embodiment of the ventilation system of the present invention, and FIG. 15 shows a state before the repair. As shown in FIG. 15, the wall has an air-conditioning hole (through hole) 24a in the upper position, a gas stove hole 24c in the lower position, and a ventilation port 4 for 24-hour ventilation in the vertical center. A hole 24b is provided, and in the present embodiment, the hole 24b at the central portion is used as the ventilation port 4. The hole 24a in the upper part of the wall and the hole 24c in the lower part which are not used are filled.

As shown in FIG. 13, in the ventilation port 4, as in the first embodiment, the fan 26 is attached to the indoor side of the hole 24b formed in the outer wall 23, and the pressure chamber 35 is provided so as to surround the fan 26. .. The opening of the inner wall 32 on the indoor side of the ventilation port 4 is closed by attaching the inspection lid 28.

In this ventilation system, as shown in FIGS. 12 and 13, a communication passage 6 is provided from the pressure chamber 35 to the intermediate layer 5, and the communication passage 6 is an air blowing pipe provided above the intermediate layer 5 in the left-right direction. 6a and a relay pipe 6b that connects the air blowing pipe 6a and the pressure chamber 35. The air blowing pipe 6a and the relay pipe 6b are formed of resin round pipes, and the relay pipe 6b is thicker than the air blowing pipe 6a. The relay pipe 6b is arranged inside the wall.
As shown in FIG. 13, the air blowing pipe 6a has a tip end portion embedded in the frame 14, a base end portion connected to the relay pipe 6b by an elbow 38, and an air inlet/outlet port 29 provided at a lower portion in the longitudinal direction. It is provided. As shown in FIG. 14, the distance between the air inlets/outlets 29 is set such that the distance a on the front end side is wider than the distance b on the base end side.

As in the first embodiment, the ventilation system of the second embodiment adjusts the room to a negative pressure by the ventilation equipment 34 at the upper part of the bathroom in the winter season, and the outside air to the pressure chamber 35 by the fan 26 incorporated in the ventilation port 4. After sucking and increasing the pressure, outside air is introduced into the intermediate layer 5 between the outer window and the inner window through the communication passage 6 (relay pipe 6b and air blowing pipe 6a), and the air inlet/outlet port 29 provided on the lower surface of the air blowing pipe 6a. The outside air is blown downward or obliquely downward toward the outer window 1. At that time, by making the relay pipe 6b thicker than the air blowing pipe 6a, the pressure loss can be reduced even if the communication passage 6 becomes long, and the amount of air blown out from the air inlet/outlet 29 of the air blowing pipe 6a does not decrease. A predetermined flow rate can be secured. In the air blowing pipe 6a, since air is more likely to flow out from the air inlet/outlet 29 on the tip end side than the air inlet/outlet 29 on the base end side, the distance a between the air inlet/outlet ports 29 on the tip end side is set to be larger than that between the air inlet/outlet ports 29 on the base end side. By making it wider than the interval b, it is possible to uniformly send air to the entire middle layer 5 in the left-right direction.
Thereafter, the cold outside air descends along the inner surface of the glass 37 of the outer window 1, folds back at the end of the intermediate layer 5, rises along the outer surface of the glass 20 of the inner window 2, and during this time from the room to the outdoors. Recover the heat that escapes to. After that, the warmed outside air flows into the room through the ventilation part 3 of the inner window 2. Thus, by recovering the heat escaping from the room to the room by the flow of air and returning it to the room, a very high heat insulation performance can be obtained and the heating load can be reduced.

Contrary to winter, in the summer, the air pressure in the room is adjusted to a positive pressure by the ventilation equipment 34 at the upper part of the bathroom, and the fan 26 of the ventilation port 4 is reversed to allow air to flow from the room to the outdoors, contrary to the winter. .. At that time, the air bypasses the middle layer 5 along the outer side surface of the glass 20 of the inner window 2 and the inner side surface of the glass 37 of the outer window 1, so that the solar heat and the heat transferred from the outside to the room are transferred to the air. It is possible to collect it by the flow of the air and throw it out of the room, which suppresses the acquisition of solar heat and prevents heat transfer from the outdoor side to the indoor side, which is the opposite direction to the air outflow direction. It exhibits a heat insulating effect, keeps the room cool, and can reduce the cooling load.

As described above, the present ventilation system (first and second embodiments) includes the ventilation port 4 provided in the outer wall 23, the communication passage 6, the intermediate layer 5 between the outer window and the inner window, and the inner and outer windows 2. The air flows from the outdoor to the indoor through the ventilation part 3 communicating with the room, and the heat transmitted from the indoor to the outdoor is recovered by the air flow of the intermediate layer 5 and returned to the indoor, thereby reducing the heat emitted from the window and improving the heating efficiency. Can be increased. Since there is no need for a ventilation part in the outer window 1, there is no problem in fire prevention.
By providing the baffle plate 30 on the indoor side of the communication path 6, the air flow of the intermediate layer 5 can be made to follow the outer window 1 and the inner window 2, and the heat can be efficiently recovered.

In addition, this ventilation system (first and second embodiments) has a ventilation port 4 provided in the outer wall 23, a communication passage 6, an intermediate layer 5 between the outer window and the inner window, and ventilation that communicates with the inside and outside of the inner window 2. Air flows from the room to the room through the unit 3, and the heat transferred from the room to the room is recovered by the air flow of the intermediate layer and is discharged to the room, so that the heat entering from the window can be reduced and the cooling efficiency can be improved. Since there is no need for a ventilation part in the outer window 1, there is no problem in fire prevention.
By providing the baffle plate 30 on the indoor side of the communication path 6, the air flow of the intermediate layer 5 can be made to follow the outer window 1 and the inner window 2, and the heat can be efficiently recovered.

Further, in the present ventilation system (first and second embodiments), the inner wall 32 is provided on the indoor side of the existing wall 33 having the outer window 1 and the ventilation port 4, and the prospective dimension of the window opening is increased to the indoor side. Since the inner window 2 is installed inside the window opening, the inner window 2 can be easily installed, and there is no need to make a new hole in the wall for the ventilation port, so construction is easy. Is. Further, when constructing the inner wall 32, it is easy to put the heat insulating material 7 in the wall and simultaneously perform the heat insulation repair of the wall.
In this ventilation system (first and second embodiments), the opening of the inner wall 32 on the indoor side of the ventilation port 4 is closed by a lid (inspection lid) 28, and a space for increasing pressure on the outdoor side of the lid 28. Since it has 36, the ventilation port 4 is not conspicuous when viewed internally, and the outside air can be efficiently sent to the intermediate layer 5.
The ventilation port 4 has the fan 26 for taking in outside air and the space 36 to which the communication passage 6 is connected, so that even when the communication passage 6 is formed of a pipe, the outside air can be efficiently sent to the intermediate layer 5. it can.
Since the communication passage 6 is formed of a pipe, and the air inlets/outlets 29 are provided on the lower surface side of the pipe at intervals in the longitudinal direction, the communication passage 6 can be formed at low cost, and the entire middle layer 5 in the left-right direction is formed. The outside air can be sent to. The distance between the air inlets/outlets 29 is wider on the tip end side of the pipe than on the base end side, so that air can be uniformly sent to the mid layer 5.

In the ventilation system of the second embodiment, the ventilation port (including the fan 26 and the pressure chamber 35) 4 is provided in the central portion in the height direction of the wall, so that the maintainability is improved. The communication passage 6 has an air blowing pipe 6a provided in the intermediate layer 5 between the outer window 1 and the inner window 2, and a relay pipe 6b connecting the air blowing pipe 6a and the ventilation port 4 and blowing air from the relay pipe 6b. By making it thicker than the pipe 6a, pressure loss can be reduced even if the communication passage 6 becomes long, the amount of air blown out from the air blowing pipe 6a does not decrease, and a predetermined flow rate can be secured.

The manufacturing method of the present ventilation system is such that an inner window 2 having a ventilation part 3 communicating with the inside and outside of the room is attached to the inside of the existing outside window 1, and the space between the existing ventilation port 4 communicating with the inside and outside of the outside window/inner window is increased. By providing the communication passage 6 that communicates with the intermediate layer 5 of the air, air flows indoors and outdoors through the ventilation port 4, the communication passage 6, the intermediate layer 5 between the outer window and the inner window, and the ventilation portion 3 of the inner window 2, and in the winter season. Collects the heat transferred from the room to the outside by the air flow of the middle layer 5 and returns it to the room, and in the summer, collects the heat transferred from the room to the room by the air flow of the middle layer 5 and throws it out of the room. It is possible to reduce heat input and output, and improve cooling and heating efficiency. The outer window 1 does not need to be refurbished, and by using the existing ventilation port 4, there is no need to make a new hole in the outer wall 23, and it is only necessary to refurbish the proprietary part.・Even in condominiums that require approval, it is easy to implement.
By using a pipe for the communication passage 6, the communication passage 6 can be easily formed. By providing the air inlet/outlet port 29 at the lower portion of the communication passage 6, the outside air can be blown out obliquely downward along the outer window 1.

In addition, the method of manufacturing the present ventilation system includes a step of providing the inner wall 32 on the indoor side of the existing wall 33 having the outer window 1 and the ventilation port 4, and an indoor side of the window opening whose projected dimension is increased on the indoor side. Since there is a step of mounting the inner window 2 having the ventilation portion 3 communicating with the outside and a step of providing the communication passage 6 communicating with the intermediate layer 5 between the outer window and the inner window from the existing ventilation opening 4 communicating with the inside and outside of the room, Air flows inside and outside the room through the ventilation port 4, the communication passage 6, the intermediate layer 5 between the outer window and the inner window, and the ventilation part 3 of the inner window 2. By collecting by flow and returning to the room, and in summer, heat transferred from the outside to the room is recovered by the flow of air in the middle layer 5 and discharged to the outside, so that heat entering and exiting through windows can be reduced, and cooling and heating efficiency can be improved. .. The outer window 1 does not need to be refurbished, and by using the existing ventilation port 4, there is no need to make a new hole in the outer wall 23, and it is only necessary to refurbish the proprietary part.・Even in condominiums that require approval, it is easy to implement. Further, by providing the inner wall 32 on the indoor side of the existing wall 33 and increasing the expected size of the window opening to the indoor side, the inner window 2 can be easily installed, and the heat insulating material 7 is inserted inside the wall. It is also easy to rehabilitate the insulation of the walls at the same time.
Further, in the method for manufacturing the present ventilation system, by closing the opening of the inner wall 32 on the indoor side of the ventilation port 4 with the lid 28 and forming the space 36 for increasing the pressure on the outdoor side of the lid 28, the interior view can be achieved. The ventilation port 4 is inconspicuous, and the outside air can be efficiently sent to the mid layer 5.

The invention is not limited to the embodiments described above. The structure of the outer window and the inner window does not matter. The ventilation part that communicates with the inside and outside of the inner window can be provided on the frame (for example, the upper frame) of the shoji. The communication passage leading from the ventilation port to the intermediate layer may be provided in the lower portion of the intermediate layer so that the air is blown upward.However, as in the embodiment, the communication passage is provided in the upper portion of the intermediate layer and the air is connected to the outer window. By detouring along the inner window, heat can be efficiently recovered. The ventilation system of the present invention may have any of the directions in which air flows only from the outdoor to the indoor, from the indoor to the outdoor, and from the outdoor to the indoor and from the indoor to the outdoor. Even if the air does not have a fan in the ventilation port, and the air flows into the ventilation system by adjusting the room to a positive pressure and/or a negative pressure using a ventilation fan etc. installed in another place. Good. In the embodiment, a heat insulating material is put in the wall to finish the inner wall in accordance with the installation of the inner window, but such a repair of the wall is not always necessary. INDUSTRIAL APPLICABILITY The present invention can be applied not only to a case where an inner window is attached to an existing window later, but also to a case where an outer window and an inner window are simultaneously installed in a newly built building.

1 Outer window 2 Inner window 3 Ventilation section 4 Ventilation port 5 Intermediate layer 6 Communication path 23 Outer wall

Claims (3)

It has an outside window, an inside window, and a ventilation port, and the inside window has a ventilation part that communicates with the inside and outside of the room, and the ventilation port is provided on the outside wall and takes in outside air into the room. A ventilation system having a communication passage for guiding air to an intermediate layer between an outer window and an inner window. It has an outer window, an inner window, and a ventilation port, and the inner window has a ventilation part that communicates with the inside and outside of the room, and the ventilation port is provided on the outer wall to exhaust the air in the room to the outside. -A ventilation system characterized by having a communication path for guiding the air in the middle layer between the inner windows to the ventilation port. A step of installing an inner window having a ventilation part that communicates with the inside and outside of the existing outside window, and a step of providing a communication path from the existing ventilation port communicating with the inside and outside to the intermediate layer between the outside window and the inside window A method for manufacturing a ventilation system, comprising: