KR101581567B1 - A Natural Ventilation Apparatus - Google Patents

Abstract

The present invention relates to a natural ventilation apparatus. Specifically, the natural ventilation apparatus comprises: a body unit comprising a left and a right cover installed on the inside of a window frame, a left and a right end cap installed on the inside of the left and the right cover, an upper frame installed between the left and the right end cap, a lower frame installed between the left and the right end cap and separated from a lower side of the upper frame, and a left and a right front cover installed in front of the left and the right end cap to be moved vertically; a rotary rack disposed in the body unit, wherein a first rack gear and a second rack gear are formed on both sides relative to a center thereof, and the first rack gear penetrates the left end cap or the right end cap; a rear opening/closing flap installed behind the rotary rack and engaged with the second rack gear to open and close a gap between the upper frame and the lower frame; a front opening/closing flap installed in front of the rotary rack and engaged with the second rack gear; a filter assembly comprising a filter frame disposed in front of the front opening/closing flap, wherein a plurality of ventilation holes are formed on an upper side thereof, and an upper and a lower end thereof are fixed on the upper and the lower frame, and a filter installed on the filter frame in front of the ventilation holes; a cover installed in front of the filter frame, whose both ends are mounted on the left and the right front cover; a lifting member installed in the left and the right end cap and geared with the first rack gear; and a handle mounted on the lifting member to push the lifting member upwards or pull the lifting member downwards. The present invention improves airtight, watertight, and insulative performance.

Description

{Natural Ventilation Apparatus}

The present invention relates to a natural ventilation system, and more particularly, to a natural ventilation system capable of improving airtightness, watertightness and insulation performance and controlling the amount of ventilation.

In general, the window serves as a mining role that accepts sunlight and as a passage to ventilate indoor and outdoor air.

Contaminated indoor air causes many diseases in the human body. Especially, various dusts and microorganisms in polluted air cause respiratory diseases and allergies. In addition, pollutants (formaldehyde, volatile organic compounds , And asbestos powder) cause headache, cough, and itching.

Therefore, it is preferable to ventilate the room and the outside so that the air is frequently ventilated so that various contaminants are not accumulated in the room. For this purpose, when the window is opened and ventilation is performed, strong winds are blown into the room, and rainwater and dust are introduced into the room. In addition, in the case of the conventional window, the air containing the soot can be directly introduced into the room in the course of entering the outside air into the inside, so that not only the ventilation function is lost, but in the case of the worse case, There was a fear of inflow.

For this reason, recently, a ventilation device is installed in a window to ventilate indoor and outdoor air. However, the conventional ventilating device has a structure in which one flap is rotated to open and close, thereby causing a problem of condensation.

Application No. 10-2007-0106115 (Publication No. 10-2009-0040656, entitled " Opening and Closing Structure for Ventilation Device)

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems of the prior art described above, and it is an object of the present invention to provide a natural ventilation device capable of improving airtightness, watertightness performance, and heat insulation performance by arranging the open / close flap .

It is another object of the present invention to provide a natural ventilation device that can improve aesthetics and control the amount of outside air flowing into an indoor space.

According to an aspect of the present invention, there is provided a natural ventilation system including left and right covers installed inside a window frame, left and right end caps provided inside the left and right covers, respectively, and upper and lower frames provided between the left and right end caps, A lower frame installed between the left and right end caps, the lower frame being spaced apart from the lower frame by a predetermined distance, and left and right front covers mounted on the front of the left and right end caps, respectively; A first rack gear and a second rack gear disposed on both sides of the center of the body and having a first rack gear and a second rack gear, the first rack gear having a left end cap or a right end cap; A rear opening / closing flap installed at the rear of the rotary rack to open / close between the upper frame and the lower frame by engaging with the second rack gear; A front opening / closing flap which is installed in front of the rotating rack and engages with the second rack gear; A filter frame disposed at the front of the front opening and closing flap and having a plurality of air holes formed at an upper side thereof and having upper and lower ends fixed to the upper frame and the lower frame, The filter assembly comprising: A cover mounted at the front of the filter frame with both ends thereof mounted on the left and right front covers; A lifting member installed in the left and right end caps and coupled to the first rack gear; And an upper end coupled to the elevating member to push up the elevating member upward or to pull the elevating member downward.

Here, upper protrusions and lower protrusions are formed at one side of the left and right front covers at regular intervals; Wherein the upper and lower protrusions are slidably inserted into one side surface of the left and right end caps by a side wall, the elastic protrusion is provided on the upper side of the sliding groove to press the upper protrusion, And an upper protrusion hole and a lower protrusion hole through which the upper protrusion and the lower protrusion pass are formed on the side wall.

Further, a locking protrusion is formed on one side surface of the elevating member; The inner surfaces of the left and right end caps are formed with recesses and protrusions that are engaged with the locking protrusions sequentially and moved.

In the through holes of the left and right end caps through which the first rack gear of the rotating rack penetrates, a rack pressing piece for pressing the first rack gear to decelerate the rotating speed of the rotating rack is formed.

The upper frame may include an upper panel and an upper assembly installed in front of the upper panel and contacting the upper end of the front opening / closing flap when ventilation is not performed; The lower frame includes a lower panel and a lower assembly installed in front of the lower panel and contacting the lower end of the rear opening / closing flap when ventilation is not performed.

The natural ventilation device of the present invention configured as described above has the double opening / closing structure of the front opening / closing flap and the rear opening / closing flap combined with the rotary rack and the gear teeth, There is an advantage that it is possible to improve the heat insulation performance.

Further, since the locking protrusion of the elevating member moves vertically along the concavo-convex portions of the left and right end caps, it is possible to adjust the height of the lifting and lowering of the elevating member and thereby adjust the amount of outside air introduced into the inside space by adjusting the degree of ventilation There is an advantage.

In addition, by providing a cover that can be opened and closed at the front of the filter assembly, there is an advantage that the filter can be protected and the filter can be made invisible to the outside, thereby improving the aesthetics.

1 is a perspective view of a natural ventilation device according to the present invention.
2 is an exploded perspective view of a natural ventilation apparatus according to the present invention.
3 is a view showing a coupling relation between a left end cap, a rotating rack, and an elevating member of a natural ventilation apparatus according to the present invention.
4 is a view showing a coupling relationship between a left end cap and a left front cover of a natural ventilation apparatus according to the present invention.
5 is a view showing a coupling relation between a right end cap, a rotating rack, and an elevating member of a natural ventilation apparatus according to the present invention.
6 is a view showing a coupling relationship between a right end cap and a right front cover of a natural ventilation apparatus according to the present invention.
7 is a view showing a coupling relationship between a rotary rack, a rear opening / closing flap and a front opening / closing flap of a natural ventilation device according to the present invention.
8 is a view showing a coupling relationship between a rotating rack and an elevating member of a natural ventilation apparatus according to the present invention.
9A to 9C are views showing a state in which a lid of a natural ventilation device according to the present invention is opened.
10 is a view showing a coupling relationship between a rotary rack and a rack pressing member of a natural ventilation apparatus according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a natural ventilation device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a natural ventilation apparatus according to the present invention, and FIG. 2 is an exploded perspective view of a natural ventilation apparatus according to the present invention.

4 is a view showing the combination of the left end cap and the left front cover of the natural ventilation apparatus according to the present invention, and FIG. The relationship is shown in Fig.

5 is a view showing an engagement relationship between the right end cap of the natural ventilation apparatus according to the present invention and the rotary rack and the elevation member, FIG. 6 is a view showing the combination of the right end cap and the right front cover of the natural ventilation apparatus according to the present invention The relationship is shown in Fig.

7 is a view showing a coupling relationship between the rotary rack of the natural ventilation device according to the present invention and the rear opening / closing flap and the front opening / closing flap, FIG. 8 is a view showing a coupling relationship between the rotary rack and the elevation member of the natural ventilation device according to the present invention 9A to 9C are views showing a state in which a lid of a natural ventilation apparatus according to the present invention is opened. FIG. 10 is a view showing a connection relationship between a rotary rack of the natural ventilation apparatus and rack pressing members according to the present invention Fig.

The natural ventilation apparatus according to the present invention comprises a body 100, a rotating rack 200 installed inside the body 100, a rear opening / closing flap 300 to be coupled to the rotating rack 200, A filter assembly 500 installed in front of the front opening and closing flap 400 and a cover 500 installed in front of the filter assembly 500. The front opening and closing flap 400 is coupled to the rotary rack 200, An elevating member 700 installed inside the body 100 and a handle 800 connected to the elevating member 700. [

The body 100 includes a left cover 110 installed in the left side of the window frame, a right cover 120 installed in the right side of the window frame, a left end cap 120 installed inside the left cover 110, A right end cap 140 installed on the inner side of the right cover 120 and an upper frame 150 installed between the left and right end caps 130 and 140 and between the left and right end caps 130 and 140. [ A left front cover 170 installed at the front of the left end cap 130 and a right front cover 180 installed at the front of the right end cap 140. [

The left cover 110 and the right cover 120 are disposed so as to be in contact with the left inner surface of the window frame and the right cover 120 is in contact with the right inner surface of the window frame. They are spaced a certain distance from each other.

The left end cap 130 is installed in close contact with the inner surface of the left cover 110. The left end cap 130 has a sliding groove 131 formed on the surface facing the left end of the front opening and closing flap 400 or the rear opening and closing flap 300 in the vertical direction. And the side wall 132 is protruded in a long direction. An elastic pressing piece 133 is provided on the sliding groove 131.

The side wall 132 is protruded from one side of the left end cap 130 as described above and the upper protrusion hole 132a and the lower protrusion hole 132b are spaced apart from each other in the vertical direction.

The left end cap 130 is formed with a through hole 134 passing through the first rack gear 210 of the rotating rack 200 to be described later. A rack pressing piece 134a having elasticity is formed at the rim of the through hole 134. [

In addition, a concave-convex portion 135 is formed on the inner side surface of the left end cap 130, more specifically, on the inner bottom portion of the surface on which the through-hole 134 is formed.

In order to facilitate understanding, the sliding groove 131, the side wall 132, the elastic pressing piece 133, the through hole 134, and the concavo-convex portion 135 are all formed on one side of the left end cap 130 A sliding groove 131, a side wall 132 and an elastic pressing piece 133 are formed on the outer surface of one side thereof and a concave-convex portion 135 is formed on the inner side of one side thereof.

The right end cap 140 is installed in close contact with the inner surface of the right cover 120. The right end cap 140 has a sliding groove 141 formed on the surface facing the right end of the front opening and closing flap 400 or the rear opening and closing flap 300 in the vertical direction. And the side wall 142 protruding in the direction of the arrow. An elastic pressing piece 143 is provided on the sliding groove 141.

An upper projection hole 142a and a lower projection hole 142b are vertically spaced apart from each other in a side wall 142 formed in the right end cap 140. [

The right end cap 140 is formed with a through hole 144 passing through the first rack gear 210 of the rotating rack 200 to be described later. A rack pressing piece 144a having elasticity is formed at the rim of the through hole 144. [

Further, a recessed portion 145 is formed on the inner side surface of the right end cap 140, more specifically, on the inner lower side of the surface on which the through hole 144 is formed.

As can be seen from the above description, the left end cap 130 and the right end cap 140 have the same configuration with only different installation directions. Similarly, the left front cover 170 and the right front cover 180 are different from each other only in their installation positions, and the configurations thereof are the same as those of the left front cover 170 and the right front cover 180 .

The upper frame 150 is installed between the left end cap 130 and the right end cap 140. The upper frame 150 includes an upper panel 151 and an upper assembly 152 slidably installed in front of the upper panel 151.

Both ends of the upper panel 151 are connected to the left and right end caps 130 and 140 to form a rear side contour of the body 100.

The upper assembly 152 is in contact with the upper end of the front opening / closing flap 400 when ventilation is not being performed. When the ventilation is performed, the front opening / closing flap 400 is moved downward to be separated from the upper end of the front opening / closing flap 400, so that a certain space is formed between the front opening / closing flap 400 and the front opening / closing flap 400.

The lower frame 160 is installed between the left end cap 130 and the right end cap 140 and is spaced a certain distance below the upper frame 150. The lower frame 160 includes a lower panel 161 and a lower assembly 162 slidably installed in front of the lower panel 161.

Both ends of the lower panel 161 are connected to the left and right end caps 130 and 140 to form a rear side contour of the body 100 together with the upper panel 151.

The lower assembly 162 is in contact with the lower end of the rear opening / closing flap 300 when not ventilating. When ventilation is performed, the rear opening / closing flap 300 is lifted upwards and separated from the lower end of the rear opening / closing flap 300, so that a certain space is generated between the rear opening / closing flap 300 and the rear opening / closing flap 300.

The left front cover 170 is installed to be movable up and down in front of the left end cap 130. The front surface of the left end cap 130 is opened, and the front surface opened by the left front cover 170 is sealed.

The upper protrusion 173 and the lower protrusion 174 protrude from one side of the left front cover 170 at predetermined intervals. The upper protrusion 173 and the lower protrusion 174 of the left front cover 170 are inserted into the sliding groove 131 of the left end cap 130 so that the left front cover 170 is slid on the left end cap 130 As shown in Fig. When the left front cover 170 is separated from the left end cap 130, the upper protrusion 173 and the lower protrusion 174 are inserted into the upper protrusion hole 132a and the lower protrusion hole 132b of the left end cap 130, (132b) so as to be taken out of the sliding groove (131). When the left front cover 170 is coupled to the left end cap 130, the upper protrusions 173 and the lower protrusions 174 are inserted into the sliding grooves 132a through the upper protrusion holes 132a and the lower protrusion holes 132b, As shown in FIG.

In this case, when the left front cover 170 is moved upward from the front side of the upper left end cap 130 and is fixed, the elastic pressing piece 133 provided on the left end cap 130 The upper projection 173 is pressed to prevent the left front cover 170 from falling downward. If a force larger than the urging force of the elastic pressing piece 133 is applied to the left front cover 170, the left front cover 170 goes downward.

The right front cover 180 is installed to be movable up and down in front of the right end cap 140. The front end of the right end cap 140 is opened, and the front opened by the right front cover 180 is sealed.

The upper protrusion 183 and the lower protrusion 184 protrude from one side of the right front cover 180 at predetermined intervals. The upper protrusion 183 and the lower protrusion 184 of the right front cover 180 are inserted into the sliding groove 141 of the right end cap 140 so that the right front cover 180 is slid on the right end cap 140 As shown in Fig. When the right front cover 180 is separated from the right end cap 140, the upper protrusion 183 and the lower protrusion 184 are separated from the upper protrusion hole 142a and the lower protrusion hole 142b of the right end cap 140, (142b) so as to be taken out of the sliding groove (141) of the right end cap (140). When the right front cover 180 is coupled to the right end cap 140, the upper protrusion 183 and the lower protrusion hole 142b are connected to each other through the upper protrusion hole 142a and the lower protrusion hole 142b of the right end cap 140, The protrusion 184 may be inserted into the sliding groove 141.

More specifically, in a state in which the right front cover 180 is moved upward from the front surface of the right upper end cap 140 to be fixed, the elastic pressing pieces 143 provided on the right end cap 140 The upper protrusion 183 of the right front cover 180 is pressed to prevent the right front cover 180 from falling downward. If a force larger than the urging force of the elastic pressing piece 143 is applied to the right front cover 180, the right front cover 180 moves downward.

The rotary rack 200 is installed on both the left and right sides of the body 100 when the knob 800 is installed on both the left and right sides. When the knob 800 is installed on only one side of the body, Respectively. The first rack gear 210 and the second rack gear 220 are formed on both sides of the rotary rack 200 with respect to the center.

The first rack gear 210 passes through the left end cap 130 and / or the right end cap 140. More specifically, the left end cap 130 and the right end cap 140 have through holes 134 and 144, respectively. The first rack gear 210 is inserted into the through holes 134 and 144.

The rotary rack 200 has an insertion groove 230 formed on the side of the first rack gear 210 and a rack pressing piece 134a formed on a rim of the through holes 134 and 144 of the left and right end caps 130 and 140. [ And 144a are inserted into the insertion groove 230. The first rack gear 210 rotates in a state where the first rack gear 210 is inserted into the through holes 134 and 144. The first rack gear 210 rotates in the left end cap 130 and / The rack pressing members 134a and 144a are inserted into the insertion groove 230 to prevent the rotary rack 200 from being separated.

The second rack gear 220 is engaged with the front opening and closing flap 400 and the rear opening and closing flap 300. When the second rack gear 220 rotates, Closing flap 400 and the rear opening-closing flap 300 are moved upward or downward.

The rear opening / closing flap 300 is installed behind the rotary rack 200. The rear opening / closing flap 300 serves to open and close a space between the upper panel 151 and the lower assembly 162. More specifically, the rear opening / closing flap 300 is formed with gear teeth to be meshed with the second rack gear 220, so that when the second rack gear 220 rotates, it moves upward or downward, And opens / closes between the upper frame 150 and the lower frame 160.

The front opening / closing flap (400) is installed forward in relation to the rotary rack (200). The front opening / closing flap 400 serves to open and close the ventilation hole 511 of the filter assembly 500 to be described later. More specifically, the front opening / closing flap 400 is provided at the rear surface thereof with gear teeth to be meshed with the second rack gear 220. Therefore, when the second rack gear 220 rotates, it moves upward or downward, And opens and closes the ventilation holes 511 of the filter assembly 500.

The filter assembly 500 includes a filter frame 510 and a filter 520 installed in the filter frame 510.

The filter frame 510 is disposed in front of the front opening and closing flap 400 and has an upper end connected to the upper assembly 152 of the upper frame 150 and a lower end connected to the lower end of the lower frame 160 Assembly 162. As shown in FIG. The filter frame 510 has a plurality of vent holes 511 formed thereon.

The filter 520 is installed in a sliding manner of the filter frame 510, and is installed in front of the vent hole 511.

Both ends of the lid 600 are respectively mounted on the left front cover 170 and the right front cover 180 and are installed in front of the filter frame 510. More specifically, the left front cover 170 and the right front cover 180 are provided with mounting grooves 171 and 181, respectively, and the lower ends thereof have fitting grooves 172 and 182, respectively. And the lower end thereof is fitted in the fitting grooves 172, When the user pushes up the lid 600 in this state upward, the left and right front covers 170 and 180 are also raised. When the user lowered the left and right front covers 170 and 180, the left and right front covers 170 and 180 are also lowered.

The elevating member 700 is installed inside the left end cap 130 and the right end cap 140. The left end cap 130 and the right end cap 140 are opened on the front surface and a hollow space is formed therein. An elevating member 700 is inserted into the hollow space.

The gear teeth 710 of the elevating member 700 are connected to the left end cap 130 and the right end cap 710. The gear teeth 710 of the elevating member 700 are vertically long, 140 of the rotary rack 200 inserted through the through holes 134, 144 of the first and second rack gears 140, 140. Therefore, when the lifting member 700 is lifted upward or downward, the rotary rack 200 rotates clockwise or counterclockwise.

A locking protrusion 720 is protruded from one side surface of the elevating member 700. The locking protrusions 720 move when the protrusions 135 and 145 formed on the inner surfaces of the left and right end caps 130 and 140 are sequentially engaged. Therefore, when the elevating member 700 is moved upward, the engaging protrusions 720 are fitted into the recesses formed in the concave and convex portions 135 and 145. In the state where the engaging protrusions 720 are fitted into the groove portions at certain specific positions, When the rising of the member 700 is stopped, the elevating member 700 stops at that position. If the elevating member 700 is to be further elevated, the user may grasp the handle 800 and push it up with a larger force.

The upper portion of the handle 800 is coupled to the elevating member 700. Therefore, when the user holds the handle 800 and pushes it upward, the lifting member 700 is lifted upward, and when the lifting member 700 is pulled downward, the lifting member 700 is pulled downward.

Meanwhile, a packing 900 is installed on the front surfaces of the left and right covers 110 and 120. The packing (900) is brought into close contact with the ends of the left and right front covers (170, 180) to minimize leakage of air flowing in and out of the room.

The operation of the natural ventilation system according to the present invention will be briefly described below.

When ventilation of the indoor space is required, the user grasps the cover 600 and pulls it downward.

When the lid 600 is pulled downward, the left and right front covers 170 and 180 are also pulled downward, and the filter 520 is exposed to the indoor space.

In this state, when the user grips the handle 800 and pushes it upward, the lift member 700 is lifted upward, and the rotary rack 200 is rotated by the tooth coupling with the lift member 700. [

When the rotary rack 200 rotates, the front opening / closing flap 400 is lowered to the lower side of the filter 520, and the rear opening and closing flap 300 is lifted up to the upper panel 150 151 and the lower panel 161 of the lower frame 160. As shown in FIG.

The air in the indoor space is continuously passed through the ventilation holes 511 of the filter assembly 500 and the filter and then discharged to the outside through the gap between the upper panel 151 and the lower panel 161. Conversely, the outdoor air flows into the body part 100 through the pipe between the upper panel 151 and the lower panel 161, and then flows through the filter 520 and the ventilation hole 511 in succession to the indoor space do.

100: Body part 110: Left cover
120: right cover 130: left end cap
131: sliding groove 132: side wall
132a: upper projection hole 132b: lower projection hole
133: Elastic pressing piece 134: Through hole
134a: rack pressing piece 135: concave / convex portion
140: Right end cap 141: Sliding groove
142: side wall 142a: upper projection hole
142b: Lower protrusion hole 143: Elastic pressing piece
144: Through hole 144a: Rack pressing piece
145: concave / convex portion 150: upper frame
151: upper panel 152: upper assembly
160: lower frame 161: lower panel
162: Lower assembly 170: Left front cover
171: mounting groove 172: fitting groove
173: Upper projection 174: Lower projection
180: right front cover 181: mounting groove
182: fitting groove 183: upper projection
184: Lower protrusion 200: Rotating rack
210: first rack gear 220: second rack gear
300: rear opening / closing flap 400: front opening / closing flap
500: filter assembly 510: filter frame
511: vent hole 520: filter
600: lid 700: elevating member
710: gear teeth 720:
800: Handle 900: Packing

Claims (6)

The left and right covers 110 and 120 are installed on the left and right covers 110 and 120 and the left and right end caps 130 and 140 are installed inside the left and right covers 110 and 120. The upper frame 150 is disposed between the left and right end caps 130 and 140, A lower frame 160 installed between the left and right end caps 130 and 140 and spaced apart from the lower frame 150 by a predetermined distance and left and right side frames 140 and 140 installed in front of the left and right end caps 130 and 140, A body part 100 composed of front covers 170 and 180;
A first rack gear 210 and a second rack gear 220 are formed on both sides of the center of the body 100 and the first rack gear 210 is connected to the left end cap A rotating rack 200 passing through the left end cap 130 or the right end cap 140;
A rear opening / closing flap (300) installed at the rear of the rotary rack (200) to open / close between the upper frame (150) and the lower frame (160) by engaging with the second rack gear (220);
A front opening / closing flap (400) installed at a front side of the rotary rack (200) and engaged with the second rack gear (220);
A plurality of ventilation holes 511 are formed on the upper side of the front opening and closing flap 400 and a filter frame 510 having upper and lower ends fixed to the upper frame 150 and the lower frame 160, And a filter 520 installed on the filter frame 510 and installed in front of the ventilation hole 511;
A lid 600 installed at the front of the filter frame 510 with both ends thereof fixed to the left and right front covers 170 and 180;
An elevating member 700 installed inside the left and right end caps 130 and 140 and coupled to the first rack gear 210;
And a handle 800 coupled to the elevating member 700 so that an upper end of the elevating member 700 is pushed upward or pulled downward.
The method according to claim 1,
Upper protrusions 173 and 183 and lower protrusions 174 and 184 are formed at regular intervals on one side of the left and right front covers 170 and 180,
The upper and lower protrusions 173 and 183 and the lower protrusions 174 and 184 are slidably inserted into one side surface of the left and right end caps 130 and 140. The sliding grooves 131 and 141 are vertically formed by the side walls 132 and 142, The upper protrusions 173 and 183 and the upper protrusions 174 and 184 pass through the side walls 132 and 142. The upper protrusions 173 and 183 pass through the upper protrusions 173 and 183, 132a, 142a and the lower projection holes 132b, 142b.
The method according to claim 1,
A locking protrusion 720 is formed on one side surface of the elevating member 700,
Wherein protrusions (135, 145) are formed on the inner side surfaces of the left and right end caps (130, 140) so that the protrusions (720) are sequentially engaged with the protrusions (135, 145).
The method according to claim 1,
The rotary rack 200 has an insertion groove 230 formed on the side of the first rack gear 210 and a through hole 134 and 144 formed in the left and right end caps 130 and 140, And the pressure pieces (134a, 144a) are formed.
The method according to claim 1,
The upper frame 150 includes an upper panel 151 and an upper assembly 152 disposed in front of the upper panel 151 and contacting the upper end of the front opening and closing flap 400 when not ventilating ,
The lower frame 160 includes a lower panel 161 and a lower assembly 162 disposed in front of the lower panel 161 and contacting the lower end of the rear opening and closing flap 300 when not ventilating Features natural ventilation.
The method according to claim 1,
Wherein a packing (900) is installed on a front surface of the left and right covers (110, 120).

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