A ventilation duct for a breeding house

Abstract

The present invention discloses a ventilation duct for a breeding house, which includes a ventilation duct, a top plate arranged on the ventilation duct, a sliding part arranged between the ventilation duct and the top plate, a fixed wooden square arranged on the top plate, and a wind-gathering duct arranged on the fixed wooden square; the ventilation duct consists of a duct main body in a "U" shape, an A air inlet duct arranged at any one end of the duct main body, a plurality of A air outlet openings penetrating through the left side wall and the right side wall of the duct main body, B air outlet openings symmetrically arranged on the left side wall and the right side wall of the duct main body, and fixing parts respectively arranged on the upper edges of the left side wall and the right side wall of the duct main body. The present application provides a ventilation duct for a breeding house, which effectively expands the single-layer ventilation duct, enables it to effectively achieve the effect of a multi-layer ventilation duct, and at the same time effectively overcomes the "short-circuit circulation effect" generated when using a multi-layer ventilation duct, better improves the use effect of the product, and improves the economic benefits of the product.

Description

Technical Field

[0001] This application relates to the field of ventilation equipment, and more particularly to a ventilation duct for a breeding house. Background Art

[0002] Modern breeding houses are enclosed buildings, so mechanical ventilation is essential for breeding houses. Among them, the mechanical vertical ventilation system has a shorter ventilation travel distance, more effective and uniform ventilation compared to the horizontal ventilation system. The air flow direction of the vertical ventilation system is as follows: air enters the attic above the ceiling board of the building from the building air inlet, and then enters the enclosed breeding house through the automatic air valve distribution system distributed on the ceiling board to achieve air exchange, and then enters the deep pit of the building and finally is discharged outside the building from the building air outlet. Single-layer or multi-layer ventilation ducts are widely used in the vertical ventilation system of breeding houses to change the ventilation direction and improve the ventilation uniformity.

[0003] Among them, the disadvantage of the single-layer ventilation duct is also obvious, that is, the cross-sectional area of the ventilation duct is limited.

[0004] For example, the cross-sectional area of a duct with a height of 0.2 m and a width of 0.8 m is 0.16 m 2 , that is, 1.7 ft 2 . Such a duct is already a duct with a relatively large cross-sectional area in a single-layer ventilation duct, but this cross-sectional area is not sufficient to meet the air exchange requirements for covering all animal bodies in the corresponding optimal enclosed space; there are usually two solutions: First, increase the number of ducts; Second, increase the cross-sectional area of the ducts. However, either of these two solutions will either increase the storey height of the breeding house building or affect the installation of other equipment. And the multi-layer duct system adopts the solution of increasing the number of ducts.

[0005] In a multi-layer ventilation duct system, it is achieved by separating the paths of basic ventilation and cooling ventilation and controlling different ventilation volumes through different ducts. Among them, the basic ventilation is achieved by manually adjusting a slide plate installed parallel to the cross-section of the first duct inlet, and the cooling ventilation automatically controls the automatic opening and closing of a slide plate fixed at the top of another duct through the difference between the temperature change in the enclosed breeding house and the target temperature, so as to realize the automatic adjustment of the perceived temperature in the breeding house.

[0006] Generally, the cross-sectional area of the air outlet in a multi-layer duct system is fixed. The cross-sectional area of the cooling ventilation is calculated according to the maximum ventilation rate in hot weather and is usually evenly distributed along the length of the duct. The length of the air outlet is as long as the length of the duct. In actual installation and application, as long as the height of the air outlet is selected and fixed.

[0007] Then there will be a problem with the cooling ventilation of the multi-layer pipe system: the cross-sectional area of the air inlet controlled by the slide plate changes linearly, while the cross-sectional area of the air outlet for cooling ventilation remains fixed. Before the cross-sectional area of the air inlet opened by the slide plate is smaller than the cross-sectional area of the air outlet for cooling ventilation, the basic wind speed and the cooling wind speed in the closed breeding house will both drop rapidly. In severe cases, the wind speed may even disappear, and ultimately, the ventilation will form a "short-range circulation effect", resulting in insufficient or uneven ventilation in the closed breeding house.

[0008] There is another problem with the multi-layer pipe system. Since the slide plate is hidden inside the cooling ventilation pipe, and due to the small height and high position of the air outlet holes for cooling ventilation, in actual production, it is very difficult for the breeding staff working in the closed breeding house to directly observe whether the slide plate is open or closed. Mechanical failures may occur to the slide plate, such as stopping opening, stopping closing, falling off, and loosening, etc. Even when the program parameters are set incorrectly, the slide plate will also malfunction. For example, when the temperature in the breeding house is lower than the target temperature, the slide plate may open incorrectly; or when the temperature in the breeding house is higher than the target temperature, the slide plate may close incorrectly, etc. When the above failures occur on-site, if the production staff cannot directly and timely discover and report them, it will cause incorrect ventilation. If not discovered for a long time, it is very likely to cause the outbreak of diseases in the pig herd, such as diarrhea, cough, etc., which will cause direct and indirect economic losses to the breeding farm owner. Summary of the Invention

[0009] Aiming at the deficiencies of the prior art, the present application provides a ventilation pipe for a breeding house, which effectively expands a single-layer ventilation pipe so that it can effectively achieve the effect of a multi-layer ventilation pipe. At the same time, it effectively overcomes the "short-range circulation effect" generated when using a multi-layer ventilation pipe, better improves the use effect of the product, and improves the economic benefits of the product.

[0010] A ventilation pipe for a breeding house includes a ventilation pipe, a top plate provided on the ventilation pipe, a sliding part provided between the ventilation pipe and the top plate, a fixed wooden square provided on the top plate, and a wind-gathering pipe provided on the fixed wooden square; the ventilation pipe is composed of a pipe body in a "U" shape, an A air inlet provided at any one end of the pipe body, a plurality of A air outlets penetrating through the left and right side walls of the pipe body, B air outlets symmetrically provided on the left and right side walls of the pipe body, and fixing parts respectively provided on the upper edges of the left and right side walls of the pipe body.

[0011] Preferably, the B air outlet is located above the A air outlet; an air outlet sheath is also provided on the A air outlet.

[0012] Further, the sliding part is composed of a skateboard frame and a skateboard assembly arranged in the skateboard frame; the skateboard assembly is composed of a skateboard and side windshields symmetrically arranged on the left and right sides of the skateboard and extending downward; the skateboard frame is composed of slide rails symmetrically arranged on the left and right sides of the skateboard, and frame side strips respectively fixed at the ends and tails of the slide rails and embedded in the slide rails.

[0013] Preferably, the slide rail matches the fixing part, and the edges of the slide rail and the fixing part are tangent; the length of the side windshield is greater than or equal to the length of the B air outlet, and the height of the side windshield is greater than or equal to the height of the B air outlet.

[0014] Furthermore, the top plate is composed of a ceiling plate and a top plate opening formed in the ceiling plate; the top plate opening penetrates the ceiling plate up and down, and the length and width of the ceiling plate both match the main body of the pipeline.

[0015] Preferably, the fixing wooden square is composed of two frame wooden squares arranged in parallel on the ceiling plate and several partition wooden squares arranged in parallel between the frame wooden squares; the bottom surfaces of the frame wooden squares and the partition wooden squares are on the same horizontal plane as the top surface of the ceiling plate.

[0016] In addition, the wind-gathering pipeline is composed of a wind-gathering cylinder and a B air inlet arranged at the end of the wind-gathering cylinder; the wind-gathering cylinder is fixed between two frame wooden squares and two adjacent partition wooden squares.

[0017] Preferably, the cross-section of the wind-gathering cylinder matches the top plate opening.

[0018] Preferably, the ratio of the cross-sectional area of the B air inlet to the cross-sectional area of the B air outlet is 5 - 10.

[0019] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0020] (1) The present invention is an extended design based on a single-layer ventilation pipe. Its main body only has one layer of ventilation pipeline, which can effectively reduce the laying cost of the product and the occupation of the production space by the product.

[0021] (2) The present invention realizes basic ventilation and cooling ventilation on the same pipeline, providing a new air supply method for the industry and promoting the development of the industry well.

[0022] (3) The B air outlet of the present invention can be used as both an air outlet and an observation window. Through the B air outlet, the opening and closing condition of the skateboard can be effectively observed, so that the operator can immediately discover when the equipment fails, improving the safety of product use.

[0023] (4) When the present invention is opened or closed, the cross-sectional areas of the B air inlet and the B air outlet can maintain a fixed ratio, effectively avoiding the occurrence of the "short-circuit circulation effect" and improving the stability of product use.

[0024] Some additional features of this application can be described below. Through the examination of the following description and the corresponding drawings, or the understanding of the production or operation of the embodiments, some additional features of this application are obvious to those skilled in the art. The features disclosed in this application can be realized and achieved through the practice or use of various methods, means, and combinations of the specific embodiments described below. Brief Description of the Drawings

[0025] The drawings described herein are used to provide a further understanding of this application, form a part of this application, and the schematic embodiments and descriptions thereof are used to explain this application and do not constitute a limitation to this application. In each figure, the same reference numerals represent the same components. Among them,

[0026] Figure 1 is the exploded view of the present invention.

[0027] Figure 2 is the three-dimensional view of the present invention when the skateboard is closed.

[0028] Figure 3 is the three-dimensional view of the present invention when the skateboard is partially opened.

[0029] Figure 4 is Figure 3 the three-dimensional view from another angle.

[0030] Figure 5 is the three-dimensional view of the present invention when the skateboard is fully opened.

[0031] Description of the Reference Numerals in the Drawings: 100, ventilation duct; 101, A air inlet duct; 102, A air outlet; 103, B air outlet; 104, air outlet sheath; 105, fixing member; 200, sliding part; 201, skateboard; 202, frame side bar; 203, slide rail; 204, side wind shield part; 300, top plate; 301, ceiling plate; 302, top plate opening; 400, fixed wooden square; 401, frame wooden square; 402, partition wooden square; 500, wind-gathering duct; 501, wind-gathering cylinder; 502, B air inlet. Detailed Description of the Embodiments

[0032] To enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the protection scope of this application.

[0033] It should be noted that if terms such as "first" and "second" are involved in the description and claims of this application and the above-mentioned drawings, they are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of this application described here. In addition, if terms such as "comprising" and "having" and any of their variations are involved, the intention is to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0034] In this application, if terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. are involved, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated device, element, or component must have a specific orientation or be constructed and operated in a specific orientation.

[0035] Moreover, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0036] In addition, in this application, if terms such as "install", "set", "be provided with", "connect", "be connected", "be sleeved" are involved, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can also be internal communication between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] Embodiment

[0039] As Figure 1 shown, a ventilation duct for a breeding house includes a ventilation duct 100, a top plate 300 provided on the ventilation duct 100, a sliding part 200 provided between the ventilation duct 100 and the top plate 300, a fixed wooden square 400 provided on the top plate 300, and a wind-gathering duct 500 provided on the fixed wooden square 400.

[0040] Among them, the function of the ventilation duct is to complete the ventilation of the breeding house, and the sliding part is used to control the air intake volume of the wind-gathering duct and the cooling air outlet volume of the ventilation duct.

[0041] The ventilation duct 100 is composed of a duct main body in a "U" shape, an A air inlet duct 101 provided at any one end of the duct main body, a plurality of A air outlet openings 102 penetrating the left and right side walls of the duct main body, B air outlet openings 103 symmetrically provided on the left and right side walls of the duct main body, and fixing parts 105 respectively provided on the upper edges of the left and right side walls of the duct main body.

[0042] The duct main body of the ventilation duct is basically the same as the existing single-layer ventilation duct, and the difference lies only in the B air outlet openings provided on the side walls of the duct main body. The actual function of the B air outlet openings is to increase the air outlet volume when needed, so as to achieve the effect of cooling and ventilating the external environment.

[0043] The B air outlet openings 103 are located above the A air outlet openings 102; an air outlet sheath 104 is also provided on the A air outlet openings 102.

[0044] The purpose of setting the B air outlet openings above the A air outlet openings is to make the B air outlet openings cooperate more effectively with the sliding part, and at the same time ensure that the normal operation of the A air outlet openings will not be affected by the use of the sliding part.

[0045] The sliding part 200 is composed of a skateboard frame and a skateboard component provided in the skateboard frame; the skateboard component is composed of a skateboard 201 and side wind-blocking parts 204 symmetrically provided on the left and right sides of the skateboard 201 and extending downward; the skateboard frame is composed of slide rails 203 symmetrically provided on the left and right sides of the skateboard 201, and frame side bars 202 respectively fixed at the ends and tails of the slide rails 203 and embedded in the slide rails 203.

[0046] The function of the frame side bars is to complete the overall fixation of the skateboard frame and make the slide rails parallel to each other.

[0047] In addition, a corresponding sliding structure is provided on the skateboard, and the sliding structure is embedded in the slide rail so that the skateboard can move along the slide rail. The sliding structure is a prior art. Structures such as pulleys and slide bars can all be used as the sliding structure to achieve the above purpose. Those skilled in the art can complete the selection, setting, and use of the sliding structure according to actual production and use requirements without creative labor, and thus will not be elaborated here.

[0048] The slide rail 203 matches the fixing member 105, and the edges of the slide rail 203 and the fixing member 105 are tangent; the length of the side wind shield 204 is greater than or equal to the length of the B air outlet 103, and the height of the side wind shield 204 is greater than or equal to the height of the B air outlet 103.

[0049] The function of the fixing member is to facilitate the installation and use of the slide rail and can achieve a sealing effect. The fixing member is a prior art. F-shaped fixing members, L-shaped fixing members, or other models of fixing members that can achieve the above purpose can be selected. Those skilled in the art can select the specific model of the fixing member according to actual installation and use requirements. Their installation and use are both prior arts in this field and can be completed without creative labor, so they will not be elaborated here.

[0050] The length and height of the side wind shield are both greater than or equal to those of the B air outlet to ensure that the side wind shield can completely block the B air outlet, so that the B air outlet of the product can be completely closed, avoiding the situation where the use effect of the product is reduced due to air leakage from the B air outlet.

[0051] It should be noted that the sliding of the skateboard can be manually controlled by an operator through pushing or pulling, or can be controlled by setting structures such as telescopic rods and drive motors. The above control methods are all conventional control methods in this field. Those skilled in the art can complete their setting and use without creative labor, so the specific control structure is not shown and described in the figure.

[0052] The top plate 300 is composed of a ceiling plate 301 and a top plate opening 302 opened on the ceiling plate 301; the top plate opening 302 penetrates the ceiling plate 301 up and down, and the length and width of the ceiling plate 301 both match the pipeline main body.

[0053] The top plate is basically the same as the top plate of the existing single-layer ventilation pipeline, except that it is arranged above the sliding part and is provided with a top plate opening for air intake. Its setting and use methods are both prior arts. Those skilled in the art can complete its setting and use without creative labor, so they will not be elaborated here.

[0054] The fixed wooden square 400 is composed of two frame wooden squares 401 arranged in parallel on the ceiling board 301 and several partition wooden squares 402 arranged in parallel between the frame wooden squares 401; the bottom surfaces of the frame wooden squares 401 and the partition wooden squares 402 are located on the same horizontal plane as the top surface of the ceiling board 301.

[0055] The function of the fixed wooden square is to facilitate the overall installation of the product and the connection and fixation of the air-gathering duct. The distance between the partition wooden squares can be adjusted according to actual needs. Their setting and use are both prior arts in this field, and those skilled in the art can complete their setting and use without creative labor, so no further elaboration will be made here.

[0056] The air-gathering duct 500 is composed of an air-gathering cylinder 501 and a B air inlet 502 arranged at the end of the air-gathering cylinder 501; the air-gathering cylinder 501 is fixed between two frame wooden squares 401 and two adjacent partition wooden squares 402.

[0057] The B air inlet is used to introduce air flow to cool the room. The introduction method can be natural introduction or fan introduction. The above methods are all prior arts in this field, so no further elaboration will be made here.

[0058] The cross-section of the air-gathering cylinder 501 matches the opening 302 of the top plate.

[0059] The ratio of the cross-sectional area of the B air inlet to the cross-sectional area of the B air outlet is 5 - 10.

[0060] Don D. Jones and William H. Friday's research found that the width of the breeding house covered by the unilateral holes of the duct should not exceed 20 feet (about 6.1 meters), and the best size is 15 feet, that is, 4.57 meters. In order to save the duct, the duct is normally designed with bilateral holes. Therefore, the coverage width of 1 duct is between 30 - 40 feet, that is, between 9.1 - 12.2 meters. Designed according to the maximum width, a breeding house with a width of 40 feet and a length of 50 feet can raise 240 growing pigs. Don D. Jones and William H. Friday disclosed that the ventilation rates for humidity control, odor control, and hot climate ventilation of growing pigs are 5 cfm, 18 cfm, and 120 cfm respectively. Therefore, the ventilation rates for humidity control, odor control, and hot climate ventilation of 240 growing pigs are 1200, 4320, and 28800 cfm. Usually, the maximum wind speed designed for the pig house is 1500 fpm. To meet the requirements of humidity control, odor control, and hot climate ventilation rate of this breeding house, the minimum cross-sectional areas required for the duct are 0.8 ft 2 、2.9 ft 2 and 20 ft 2Therefore, the cross-sectional area of a single-layer duct can only meet the ventilation rate for humidity control in cold climates. If the ventilation rate requirements for odor control of 240 growing pigs and in hot climates are to be met, either the cross-sectional area or the number of ducts needs to be increased.

[0061] From an economic perspective, the ducts need to be distributed according to the maximum distance. However, at this time, the ducts can only meet the ventilation volume requirements for humidity control in the breeding house in cold climates, far from meeting the ventilation rate requirements in mild and hot climates.

[0062] In the actual production process, there is no strict definition of cold, mild, and hot climates. There is only the concept of the ventilation volume adjustment critical point. The critical point divides the ventilation volume into two concepts, namely the basic ventilation volume and the cooling ventilation volume. Below the critical point is called the basic ventilation volume, and above the critical point is called the cooling ventilation volume. To maintain a relatively stable perceived temperature in a closed breeding house, it is necessary to adjust these two ventilation volumes well.

[0063] The basic ventilation volume is related to the animal species, animal age, and animal weight, showing a positive correlation. The cooling ventilation volume varies continuously with the ambient temperature, animal species, animal weight, and animal activity level, also showing a positive correlation.

[0064] However, the existing single-layer ventilation ducts are difficult to meet the above requirements. Therefore, it is necessary to increase the cross-sectional area of the single-layer ducts to improve their basic ventilation volume and cooling ventilation volume. However, this approach will greatly increase the site setup cost.

[0065] However, the product of the present application can effectively overcome the above problems.

[0066] As Figure 2 shown, when the slide plate is closed, air flows into the duct from the A air inlet and exits the duct from the A air outlet, thus completing the basic ventilation.

[0067] As Figures 3 - 5 shown, when the slide plate is opened, air flows into the duct from the A air inlet and the B air inlet respectively, and exits the duct from the A air outlet and the B air outlet respectively, thus completing both the basic ventilation and the cooling ventilation simultaneously.

[0068] During use, when the ambient temperature in the breeding house is 0.9 °C higher than the target temperature, the slide plate moves to expand the cross-sectional areas of the B air inlet and the B air outlet to increase the cooling ventilation volume of the product.

[0069] When the ambient temperature in the breeding house is 0.5 °C lower than the target temperature plus 0.5 °C, the slide plate moves to reduce the cross-sectional areas of the B air inlet and the B air outlet to decrease the cooling ventilation volume of the product.

[0070] When the environmental temperature in the breeding house is between the target temperature plus 0.5°C and 0.9°C, the slide stops moving, and the cross-sectional areas of the B air inlet and the B air outlet do not change, so that the cooling ventilation volume can be kept stable.

[0071] It should be noted that all the features disclosed in this specification, or all the steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

[0072] In addition, the above specific embodiments are exemplary. Those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also belong to the disclosure scope of the present invention and fall within the protection scope of the present invention. Those skilled in the art should understand that the description and drawings of the present invention are illustrative and do not constitute a limitation on the claims. The protection scope of the present invention is defined by the claims and their equivalents.

Claims

1. A ventilation duct for a breeding house, comprising a ventilation duct (100) and a top plate (300) arranged on the ventilation duct (100), characterized in that, It further includes a sliding part (200) arranged between the ventilation duct (100) and the top plate (300), a fixed wooden square (400) arranged on the top plate (300), and a wind-gathering duct (500) arranged on the fixed wooden square (400); the ventilation duct (100) consists of a "U"-shaped duct main body, an A air inlet duct (101) arranged at any one end of the duct main body, several A air outlet openings (102) penetrating through the left and right side walls of the duct main body, B air outlet openings (103) symmetrically arranged on the left and right side walls of the duct main body, and fixing parts (105) respectively arranged on the upper edges of the left and right side walls of the duct main body; the B air outlet opening (103) is located above the A air outlet opening (102); an air outlet sheath (104) is further arranged on the A air outlet opening (102); the sliding part (200) consists of a skateboard frame and a skateboard assembly arranged in the skateboard frame; the skateboard assembly consists of a skateboard (201) and side wind-blocking parts (204) symmetrically arranged on the left and right sides of the skateboard (201) and extending downward; the skateboard frame consists of slide rails (203) symmetrically arranged on the left and right sides of the skateboard (201), and frame side strips (202) respectively fixed at the ends and tails of the slide rails (203) and embedded in the slide rails (203); the slide rails (203) are matched with the fixing parts (105), and the edges of the slide rails (203) and the edges of the fixing parts (105) are tangent; the length of the side wind-blocking part (204) is greater than or equal to the length of the B air outlet opening (103), and the height of the side wind-blocking part (204) is greater than or equal to the height of the B air outlet opening (103).

2. The ventilation duct for a breeding house according to claim 1, characterized in that, the top plate (300) consists of a ceiling plate (301) and a top plate opening (302) opened on the ceiling plate (301); the top plate opening (302) penetrates through the ceiling plate (301) vertically, and the length and width of the ceiling plate (301) are both matched with the duct main body.

3. The ventilation duct for a breeding house according to claim 2, wherein, the fixed wooden square (400) consists of two frame wooden squares (401) arranged in parallel on the ceiling plate (301) and several partition wooden squares (402) arranged in parallel between the frame wooden squares (401); the bottom surfaces of the frame wooden squares (401) and the partition wooden squares (402) are on the same horizontal plane as the top surface of the ceiling plate (301).

4. The ventilation duct for a breeding house according to claim 3, characterized in that, the wind-gathering duct (500) consists of a wind-gathering cylinder (501) and a B air inlet (502) arranged at the end of the wind-gathering cylinder (501); the wind-gathering cylinder (501) is fixed between two frame wooden squares (401) and two adjacent partition wooden squares (402).

5. The ventilation duct for a breeding house according to claim 4, characterized in that the cross-section of the wind-gathering cylinder (501) is matched with the top plate opening (302).

6. The ventilation duct for a breeding house according to claim 5, characterized in that, the ratio of the cross-sectional area of the B air inlet (502) to the cross-sectional area of the B air outlet opening (103) is 5 - 10:1.

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