Combined air intake and exhaust duct and installation method

Abstract

The present invention relates to a combined air intake and exhaust duct and an installation method, and belongs to the technical field of air intake and exhaust ducts in kitchens and bathrooms of residential buildings. The technical scheme is: the exhaust duct and the air intake duct are composed of a wall corner and a combination component; the combination component is composed of a rectangular tube, an extended side one and an extended side two, the extended side one and the extended side two are respectively extended outward along two adjacent sides of the rectangular tube, the ends of the extended side one and the extended side two are respectively close to and fixed to the two sides of the wall corner, the rectangular tube is the exhaust duct, and the space enclosed between the rectangular tube and the two sides of the wall corner is the air intake duct. The beneficial effects of the present invention: the exhaust duct and the air intake duct are assembled by using a combination component at the wall corner, the interface is well sealed, smoke and air leakage is avoided, and the installation efficiency is improved. At the same time, an independent air intake duct is added to avoid the vacuum in the kitchen and bathroom of the residential building caused by the use of exhaust fans and range hoods, and the floor drain does not smell.

Description

Technical Field

[0001] The invention relates to a combined air intake and exhaust duct and an installation method thereof, belonging to the technical field of air intake and exhaust ducts for kitchens and toilets in residential buildings. Background Art

[0002] The smoke exhaust duct in the kitchen and bathroom is also called ventilation duct, exhaust duct, exhaust duct, etc. The common problems of the exhaust duct in the prior art are smoke and odor and low installation efficiency. The main reasons for the smoke and odor and low installation efficiency are: all the smoke exhaust ducts in the existing technology are transported to the building construction site by multiple exhaust ducts prefabricated in the factory, assembled from bottom to top in the corners of the building, and one exhaust duct is installed on each floor of the building. The interface of each floor of the exhaust duct needs to be aligned up and down, and then plastered for sealing; because the prefabricated exhaust ducts need to be installed in the corners of the room, the flatness of the wall in the corner affects the alignment of the exhaust duct interface. In addition, the exhaust ducts prefabricated in batches in the factory have size errors. Generally, the exhaust ducts on each floor differ by 2-3 cm. The exhaust duct interface is misaligned, cannot be plastered, and is not well sealed, which easily causes smoke and air leakage. In addition, the doors and windows of the kitchen and bathroom in the prior art are relatively closed, resulting in poor exhaust. When using exhaust fans and range hoods, a vacuum will be formed in the kitchen and bathroom, causing odor from the floor drain. Summary of the invention

[0003] The purpose of the present invention is to provide a combined air intake and exhaust duct and an installation method, which utilizes the wall corner to use a combination of parts to assemble the smoke exhaust duct and the air intake duct, and the interface is well sealed to avoid smoke and air leakage, thereby improving the installation efficiency. At the same time, an independent air intake duct is added to avoid the vacuum in the residential kitchen and bathroom caused by the use of exhaust fans and range hoods, and the floor drain does not smell, thereby solving the above-mentioned problems existing in the background technology.

[0004] The technical solution of the present invention is:

[0005] A combined air intake and exhaust duct comprises at least one smoke exhaust duct and at least one air intake duct, wherein the smoke exhaust duct and the air intake duct are formed by combining a wall corner and a combination component; the combination component comprises at least the following two combination structures:

[0006] Structure 1: The assembly is composed of a rectangular tube, an extended side 1 and an extended side 2. The extended side 1 and the extended side 2 are respectively extended outward along two adjacent sides of the rectangular tube. The ends of the extended side 1 and the extended side 2 are respectively close to and fixed to the two sides of the wall corner. The rectangular tube is the smoke exhaust duct, and the space enclosed between the rectangular tube and the two sides of the wall corner is the air intake duct.

[0007] Structure 2: The assembly is composed of a large L-shaped plate and a small L-shaped plate. The length of both sides of the large L-shaped plate is greater than that of both sides of the small L-shaped plate. The ends of both sides of the large L-shaped plate are respectively close to and fixed to the two sides of the wall corner. The small L-shaped plate is buckled inside the large L-shaped plate. A rectangular tube is formed between the small L-shaped plate and the large L-shaped plate. The two sides of the large L-shaped plate outside the rectangular tube are the extended side 1 and the extended side 2 respectively. The rectangular tube is the smoke exhaust duct, and the space enclosed between the rectangular tube and the two sides of the wall corner is the air intake duct. The small L-shaped plate is the middle partition plate between the smoke exhaust duct and the air intake duct.

[0008] The final structure of the two combined structures is the same, but the combination method is different.

[0009] Furthermore, an exhaust port is provided on the smoke exhaust duct and is connected to the kitchen and bathroom of the residence, and an exhaust check valve is provided on the exhaust port; an air inlet is provided on the air inlet duct and is connected to the kitchen and bathroom of the residence, and an air inlet check valve is provided on the air inlet; the air inlet duct is connected to the air outside the residence through an air inlet pipe, and the air enters the kitchen and bathroom of the residence through the air inlet pipe, the air inlet duct and the air inlet, thereby destroying the vacuum generated in the kitchen and bathroom of the residence when using an exhaust fan and a range hood, avoiding odor from the floor drain and smoke and odor cross-talk, and keeping the air in the kitchen and bathroom of the residence fresh.

[0010] Furthermore, the air intake pipe is preset in the wall of the house, one end of the air intake pipe is connected to the air inlet duct, and the other end of the air intake pipe is connected to the air outside the house, and an air intake filter is provided on the air intake pipe.

[0011] Furthermore, a plurality of transversely arranged sealing partition plates are provided in the air inlet duct to divide the air inlet duct into a plurality of mutually independent spaces, and each independent space is provided with an air inlet pipe connected to the air outside the residence.

[0012] Furthermore, the smoke exhaust duct and the air intake duct are arranged in parallel, and share a same middle partition plate to separate the smoke exhaust duct and the air intake duct.

[0013] Furthermore, an air supply port is provided on the middle partition plate located at the bottom of the smoke exhaust duct and the air inlet duct, and a check valve is provided on the air supply port to unidirectionally connect the bottom of the smoke exhaust duct and the air inlet duct.

[0014] Furthermore, a hood is provided on the top of the smoke exhaust duct.

[0015] A method for installing a combined air intake and exhaust duct, wherein the floor slabs at the bottom and top of the corners of the kitchen and bathroom are both provided with floor slab reserved holes, a positioning sealing support is arranged in the floor slab reserved holes, the overall shape of the positioning sealing support matches the cross-sectional shape of the assembly, the assembly is arranged between the bottom and top positioning sealing support, the positioning sealing support is fixed on the floor slab next to the floor slab reserved holes, the positioning sealing support is composed of positioning ribs, a rectangular positioning plate and an L-shaped positioning plate, four of the rectangular positioning plates form a rectangular positioning frame, the inner diameter of the rectangular positioning frame matches the inner diameter of the rectangular tube, an L-shaped positioning plate is arranged outside the rectangular positioning frame, the distance between the L-shaped positioning plate and the rectangular positioning frame matches the thickness of the rectangular tube, the two ends of the L-shaped positioning plate are respectively connected to the rectangular positioning frame through corresponding positioning ribs, and the two positioning ribs respectively match the positions of the extended side one and the extended side two;

[0016] The positioning sealing support member is arranged in a reserved hole in the floor slab, wherein the lower part of the positioning sealing support member is located at the top of the lower residence and matches the top of the assembly of the lower residence, and the upper part of the positioning sealing support member is located at the bottom of the upper residence and matches the bottom of the assembly of the upper residence; the gaps between the positioning sealing support member and the assembly of the upper residence and the assembly of the lower residence are sealed by mortar; the ends of the extended side one and the extended side two of the assembly are both load-bearing angles, and the load-bearing angles are inclined structures, and the gaps between the inclined structures of the load-bearing angles and the wall corners are filled with anti-cracking mortar, and are fixed and sealed with the wall corners, so as to form an airtight smoke exhaust duct and air intake duct as a whole.

[0017] Furthermore, the positioning and sealing support member is fixed to the floor slab next to the reserved hole in the floor slab through a positioning rib support member and a rectangular plate support member; wherein: one end of the two positioning rib support members is fixed to the floor slab through expansion bolts, and the other ends of the two positioning rib support members are respectively welded to the corresponding positioning ribs; the middle part of the rectangular plate support member is welded to the corner of the rectangular positioning frame away from the L-shaped positioning plate, and both ends are fixed to the floor slab through expansion bolts.

[0018] The beneficial effects of the present invention are as follows: the smoke exhaust duct and the air inlet duct are assembled by using the assembly parts at the wall corner, the interface is well sealed, smoke and air leakage is avoided, and the installation efficiency is improved. At the same time, an independent air inlet duct is added to destroy the vacuum generated in the kitchen and bathroom of the house when the exhaust fan and the range hood are used, and there is no smell from the floor drain. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the embodiment of the present invention after installation;

[0020] Figure 2 This is a schematic diagram before installation of an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of an embodiment of the present invention after installation;

[0022] Figure 4 A cross-sectional view of the exhaust port and the air inlet of the assembly after installation of the embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the sealing support member after installation according to an embodiment of the present invention;

[0024] Figure 6 It is a top view schematic diagram of a sealing support member according to an embodiment of the present invention;

[0025] Figure 7 It is a schematic diagram of an assembly of an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the top sealing plate according to an embodiment of the present invention;

[0027] Fig. 9 A schematic diagram of a smoke exhaust duct support member for installing a sealed partition board floor according to an embodiment of the present invention;

[0028] In the figure: assembly 1, smoke exhaust duct 2, air inlet duct 3, exhaust port 4, air inlet 5, sealing partition plate 6, air supply port 7, air inlet pipe 8, wall 9, air inlet filter 10, floor 11, hood 12, top sealing plate 13, middle partition plate 14, exhaust check valve 15, air inlet check valve 16, load-bearing angle 17, floor reserved hole 18, wall corner 19, anti-cracking mortar 20, positioning sealing support 21, mortar 22, rectangular tube 23, extended edge 1 24, extended edge 25, positioning rib support 26, rectangular plate support 27, positioning rib 28, rectangular positioning plate 29, L-shaped positioning plate 30, smoke exhaust duct support 31, edge positioning member 32, corner positioning member 33, smoke exhaust duct through hole 34. DETAILED DESCRIPTION

[0029] The present invention is further described below by way of examples.

[0030] See attached Figure 1-7 A combined air intake and exhaust duct includes at least one exhaust duct 2 and at least one intake duct 3. The exhaust duct 2 and the intake duct 3 are formed by combining a wall corner 19 and a combination 1. The combination 1 includes at least the following two combined structures:

[0031] Structure 1: The assembly 1 is composed of a rectangular tube 23, an extended side 1 24 and an extended side 25. The extended side 1 24 and the extended side 25 are respectively extended outward along two adjacent sides of the rectangular tube 23. The ends of the extended side 1 24 and the extended side 25 are respectively close to and fixed to the two sides of the wall corner 19. The rectangular tube 23 is the smoke exhaust duct 2, and the space enclosed between the rectangular tube 23 and the two sides of the wall corner 19 is the air inlet duct 3.

[0032] Structure 2: Assembly 1 is composed of a large L-shaped plate and a small L-shaped plate. The length of both sides of the large L-shaped plate is greater than that of both sides of the small L-shaped plate. The ends of both sides of the large L-shaped plate are respectively close to and fixed to the two sides of the wall corner 19. The small L-shaped plate is buckled in the large L-shaped plate. A rectangular tube 23 is formed between the small L-shaped plate and the large L-shaped plate. The two sides of the large L-shaped plate outside the rectangular tube 23 are the extended side 1 24 and the extended side 2 25 respectively. The rectangular tube 23 is the smoke exhaust duct 2. The space enclosed between the rectangular tube 23 and the two sides of the wall corner 19 is the air inlet duct 3. The small L-shaped plate is the middle partition plate 14 between the smoke exhaust duct 2 and the air inlet duct 3.

[0033] The final structure of the two combined structures is the same, but the combination method is different.

[0034] See attached Figure 4 and 7 The exhaust duct 2 is provided with an exhaust port 4 which is connected to the kitchen and bathroom of the residence, and an exhaust check valve 15 is arranged on the exhaust port 4; the air inlet duct 3 is provided with an air inlet 5 which is connected to the kitchen and bathroom of the residence, and an air inlet check valve 16 is arranged on the air inlet duct 5. The air inlet duct 3 is connected to the air outside the residence through the air inlet pipe 8. The air enters the kitchen and bathroom of the residence through the air inlet pipe 8, the air inlet duct 3 and the air inlet 5, destroying the vacuum generated in the kitchen and bathroom of the residence when using the exhaust fan and the range hood, avoiding the odor from the floor drain and the cross-smoke odor, and keeping the air in the kitchen and bathroom of the residence fresh.

[0035] See attached Figure 4 The air intake pipe 8 is preset in the wall 9 of the house, one end of the air intake pipe 8 is connected to the air intake duct 3, and the other end of the air intake pipe 8 is connected to the air outside the house. The air intake pipe 8 is provided with an air intake filter 10.

[0036] See attached Figure 1 The air inlet duct 3 is provided with a plurality of transversely arranged sealing partition plates 6, which divide the air inlet duct 3 into a plurality of mutually independent spaces, and each independent space is provided with an air inlet pipe 8 connected with the air outside the residence.

[0037] See attached Figure 1 The smoke exhaust duct 2 and the air intake duct 3 are arranged in parallel, and share the same middle partition plate 14 to separate the smoke exhaust duct 2 and the air intake duct 3.

[0038] See attached Figure 1 The middle partition plate 14 at the bottom of the exhaust duct 2 and the air inlet duct 3 is provided with an air supply port 7, and a check valve (not shown in the figure) is provided on the air supply port 7. The check valve unidirectionally connects the bottom of the exhaust duct 2 and the air inlet duct 3, and can only supply air to the exhaust duct 2, but cannot return air to the air inlet duct 3. When the kitchen and bathroom are exhausted, air is supplied to the exhaust duct 2 when negative pressure is formed in the exhaust duct 2.

[0039] See attached Figure 1A hood 12 is provided on the top of the smoke exhaust duct 2, and the hood 12 is a well-known and commonly used device in the art.

[0040] A method for installing a combined air intake and exhaust duct, wherein the floor 11 at the bottom and top of the wall corner 19 of the kitchen and bathroom is provided with a floor reserved hole 18, a positioning sealing support 21 is arranged in the floor reserved hole 18, the overall shape of the positioning sealing support 21 matches the cross-sectional shape of the assembly 1, the assembly 1 is arranged between the bottom and top positioning sealing support 21, the positioning sealing support 21 is fixed on the floor 11 next to the floor reserved hole 18, and the positioning sealing support 21 is composed of a positioning rib 28, a rectangular positioning plate 29 and an L-shaped positioning plate 30 The four rectangular positioning plates 29 form a rectangular positioning frame, the inner diameter of the rectangular positioning frame matches the inner diameter of the rectangular tube 23, an L-shaped positioning plate 30 is arranged outside the rectangular positioning frame, the distance between the L-shaped positioning plate 30 and the rectangular positioning frame matches the thickness of the rectangular tube 23, and both ends of the L-shaped positioning plate 30 are connected to the rectangular positioning frame through corresponding positioning ribs 28, and the two positioning ribs 28 match the positions of the extended side 1 24 and the extended side 25 respectively;

[0041] The positioning sealing support member 21 is arranged in the reserved hole 18 of the floor slab, wherein the lower part of the positioning sealing support member 21 is located at the top of the lower residence and matches the top of the assembly 1 of the lower residence, and the upper part of the positioning sealing support member 21 is located at the bottom of the upper residence and matches the bottom end of the assembly 1 of the upper residence; the gaps between the positioning sealing support member 21 and the assembly 1 of the upper residence and the assembly 1 of the lower residence are sealed by mortar 22; the ends of the extended side 1 24 and the extended side 25 of the assembly 1 are both load-bearing angles 17, and the load-bearing angle 17 is an inclined structure. The gap between the inclined structure of the load-bearing angle 17 and the wall corner 19 is filled with anti-cracking mortar 20, and fixed and sealed with the wall corner 19, forming an airtight smoke exhaust duct 2 and air intake duct 3 as a whole.

[0042] The positioning sealing support member 21 is fixed to the floor 11 next to the reserved hole 18 of the floor through a positioning rib support member 26 and a rectangular plate support member 27; wherein: one end of the two positioning rib support members 26 is fixed to the floor 11 through expansion bolts, and the other ends of the two positioning rib support members 26 are respectively welded to the corresponding positioning ribs 28; the middle part of the rectangular plate support member 27 is welded to the corner of the rectangular positioning frame away from the L-shaped positioning plate 30, and both ends are fixed to the floor 11 through expansion bolts.

[0043] Specific installation steps of this embodiment:

[0044] First floor: install the assembly 1 in the reserved holes 18 at the bottom and top of the floor at the corner 19 of the wall, and place it upright against the corner 19; the extended side 1 24 and the extended side 25 of the assembly 1 are designed to be load-bearing angles 17 near the wall surface, and are filled with anti-cracking mortar 20 to bear the vertical force. The angles at the ends of the extended side 1 24 and the extended side 25 are for applying the anti-cracking mortar 20 to avoid air leakage.

[0045] Installation layer by layer: A positioning sealing support 21 is provided in the reserved hole 18 of the floor between the upper and lower layers. The lower part of the positioning sealing support 21 is in the lower residence, aligned with the top of the assembly 1 of the lower residence, and the upper part of the positioning sealing support 21 is in the upper residence, matching the bottom of the assembly 1 of the upper residence, used to support the assembly 1 of the upper residence, and the positioning sealing support 21 and the assemblies 1 of the upper and lower residences are sealed by mortar 22. The ends of the extended side 1 24 and the extended side 25 of the assembly 1 are load-bearing angles 17, which are sealed and fixed with the two sides of the wall corner 19 by anti-cracking mortar 20, forming an airtight exhaust duct 2 and air intake duct 3 as a whole; the outside is then sealed with concrete to make it less likely to leak, and it can be installed upward in sequence.

[0046] The positioning sealing support member 21 is fixed to the floor 11 next to the reserved hole 18 of the floor through the positioning rib support member 26 and the rectangular plate support member 27. One end of the two positioning rib support members 26 is fixed to the floor through expansion bolts, and the other ends of the two positioning rib support members 26 are respectively welded to the corresponding positioning ribs 28; the middle part of the rectangular plate support member 27 is welded to the corner of the rectangular positioning frame, and the two ends are fixed to the floor through expansion bolts, which plays a positioning and supporting effect.

[0047] Refer to the attached Figure 1 , 8 The top of the air inlet 3 on the top layer is provided with a top sealing plate 13, and the air inlet 3 on the middle layer is divided into several independent spaces by a sealing partition plate 6 to prevent air from flowing up and down. The working principle is that when the kitchen and bathroom turn on the range hood or the exhaust fan and the range hood, air is taken in from the air inlet 5 to form ventilation. The exhaust port 4 is provided with an exhaust check valve 15 that only exhausts but does not take in air, and the air inlet 5 is provided with an air intake check valve 16 that only takes in air but does not exhaust.

[0048] The top sealing plate 13 has the same structure and shape as the sealing partition plates 6 of other layers, and is provided with smoke exhaust duct through holes 34 to facilitate keeping the smoke exhaust duct 2 unobstructed.

[0049] Refer to the attached Figure 1 , 89. For floors with transversely arranged sealing partition panels 6 in the air inlet duct 3, it is necessary to install a smoke exhaust duct supporting member 31 on the floor 11 next to the reserved hole 18 in the floor at the corner 19. The smoke exhaust duct supporting member 31 is a rectangular frame, and the inner diameter of the rectangular frame matches the inner diameter of the smoke exhaust duct 2; the lower part of the smoke exhaust duct supporting member 31 is in the lower residential building and matches the top end of the smoke exhaust duct 2 of the lower residential building, and the upper part of the smoke exhaust duct supporting member 31 is in the upper residential building and matches the bottom end of the smoke exhaust duct 2 of the upper residential building.

[0050] The exhaust duct support member 31 is used to support the exhaust duct 2 of the upper residential assembly 1 and align the exhaust duct 2 of the lower residential assembly 1. The gaps between the exhaust duct support member 31 and the exhaust ducts 2 of the upper residential assembly and the lower residential assembly are sealed by mortar 22.

[0051] The corner of the smoke exhaust duct support member 31 is fixed to the floor slab 11 via a corner positioning member 33 , and the edges on both sides of the corner are fixed to the floor slab 11 via corresponding edge positioning members 32 .

[0052] The cross-sectional dimensions of the sealed partition plate 6 match those of the reserved holes 18 in the floor slab. The sealed partition plate 6 is installed on the reserved holes 18 in the floor slab of the upper residence. The sealed partition plate 6 separates the air inlet duct 3 between the assemblies 1 of the upper residence and the lower residence to prevent air from flowing between the upper and lower floors. At the same time, a smoke exhaust duct through hole 34 is provided on the sealed partition plate 6. The aperture of the smoke exhaust duct through hole 34 matches the inner diameter of the smoke exhaust duct 2, so that the smoke exhaust duct 2 between the assemblies 1 of the upper residence and the lower residence remains unobstructed.

Claims

1. A combined air intake and exhaust duct, characterized in that: It comprises at least one smoke exhaust duct (2) and at least one air inlet duct (3), wherein the smoke exhaust duct (2) and the air inlet duct (3) are formed by combining a wall corner (19) and a component (1); the component (1) comprises the following two combined structures: Structure 1: The assembly (1) is composed of a rectangular tube (23), an extended side 1 (24) and an extended side 2 (25); the extended side 1 (24) and the extended side 2 (25) are respectively extended outward along two adjacent sides of the rectangular tube (23); the ends of the extended side 1 (24) and the extended side 2 (25) are respectively close to and fixed to the two sides of the wall corner (19); the rectangular tube (23) is the smoke exhaust duct (2); and the space enclosed between the rectangular tube (23) and the two sides of the wall corner (19) is the air inlet duct (3); Structure 2: The assembly (1) is composed of a large L-shaped plate and a small L-shaped plate. The length of both sides of the large L-shaped plate is greater than that of both sides of the small L-shaped plate. The ends of both sides of the large L-shaped plate are respectively close to and fixed to the two sides of the wall corner (19). The small L-shaped plate is buckled inside the large L-shaped plate. A rectangular tube (23) is formed between the small L-shaped plate and the large L-shaped plate. The two sides of the large L-shaped plate outside the rectangular tube (23) are respectively an extended side 1 (24) and an extended side 2 (25). The rectangular tube (23) is the smoke exhaust duct (2). The space enclosed between the two sides of the rectangular tube (23) and the wall corner (19) is the air intake duct (3). The small L-shaped plate is the middle partition plate (14) between the smoke exhaust duct (2) and the air intake duct (3). The final structure of the two combined structures is the same, but the combination method is different; The exhaust duct (2) is provided with an exhaust port (4) which is connected to the kitchen and bathroom of the residence, and an exhaust check valve (15) is provided on the exhaust port (4); the intake duct (3) is provided with an intake port (5) which is connected to the kitchen and bathroom of the residence, and an intake check valve (16) is provided on the intake port (5); the intake duct (3) is connected to the air outside the residence through an intake pipe (8), and the air enters the kitchen and bathroom of the residence through the intake pipe (8), the intake duct (3) and the intake port (5); the intake pipe (8) is preset in the wall (9) of the residence, one end of the intake pipe (8) is connected to the intake duct (3), and the other end of the intake pipe (8) is connected to the air outside the residence.

2. A method for installing a combined air intake and exhaust duct according to claim 1, characterized in that: The floor slab (11) at the bottom and top of the wall corner (19) of the kitchen and bathroom is provided with a floor slab reserved hole (18), a positioning sealing support member (21) is arranged in the floor slab reserved hole (18), the overall shape of the positioning sealing support member (21) matches the cross-sectional shape of the assembly (1), the assembly (1) is arranged between the bottom and top positioning sealing support members (21), the positioning sealing support member (21) is fixed on the floor slab (11) next to the floor slab reserved hole (18), and the positioning sealing support member (21) is composed of a positioning rib (28), a rectangular positioning plate (29) and a positioning rib (28). and an L-shaped positioning plate (30), the four rectangular positioning plates (29) enclosing a rectangular positioning frame, the inner diameter of the rectangular positioning frame matching the inner diameter of the rectangular tube (23), the L-shaped positioning plate (30) being arranged outside the rectangular positioning frame, the distance between the L-shaped positioning plate (30) and the rectangular positioning frame matching the thickness of the rectangular tube (23), the two ends of the L-shaped positioning plate (30) being connected to the rectangular positioning frame through corresponding positioning ribs (28), the two positioning ribs (28) matching the positions of the extended side 1 (24) and the extended side 2 (25) respectively; The positioning sealing support member (21) is arranged in a reserved hole (18) in the floor slab, wherein the lower part of the positioning sealing support member (21) is located at the top of the lower residence and matches the top of the assembly (1) of the lower residence, and the upper part of the positioning sealing support member (21) is located at the bottom of the upper residence and matches the bottom of the assembly (1) of the upper residence; the gap between the positioning sealing support member (21) and the assembly (1) of the upper residence and the assembly (1) of the lower residence is sealed by mortar (22); the ends of the extended edge 1 (24) and the extended edge 2 (25) of the assembly (1) are both load-bearing angles (17), and the load-bearing angle (17) is an inclined structure. The gap between the inclined structure of the load-bearing angle (17) and the wall corner (19) is filled with anti-cracking mortar (20), and is fixed and sealed with the wall corner (19), so that the whole constitutes an airtight smoke exhaust duct (2) and air intake duct (3).

3. The method for installing a combined air intake and exhaust duct according to claim 2, characterized in that: The positioning seal support member (21) is fixed to the floor slab (11) beside the reserved hole (18) of the floor slab via a positioning rib support member (26) and a rectangular plate support member (27); wherein: one end of the two positioning rib support members (26) is fixed to the floor slab (11) via expansion bolts, and the other ends of the two positioning rib support members (26) are respectively welded to the corresponding positioning ribs (28); the middle part of the rectangular plate support member (27) is welded to the corner of the rectangular positioning frame away from the L-shaped positioning plate (30), and the two ends are fixed to the floor slab (11) via expansion bolts.

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