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Construction industry industry standard of the People's Republic of China JG/T
3044—1998
Ventilation duct for residential kitchen
Ventilation duct for residential kitchenConstruction standard
1998-02-09Released
Ministry of Construction of the People's Republic of China
Implementation on 1998-06-01
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JG/T3044-1998
This standard is formulated in order to improve the functional quality of residential kitchens, eliminate kitchen fume pollution, and coordinate the relationship between kitchen buildings and equipment. The formulation of this standard is the result of scientific research achieved after sufficient theoretical calculations and scientific experiments, and is based on practical application in engineering. At the same time, the opinions of relevant units and experts across the country are widely solicited, and finally the draft is reviewed and finalized by the relevant departments. This standard was proposed by the Standard and Norms Research Institute of the Ministry of Construction. This standard is under the jurisdiction of the China Building Standard Design Institute, the technical authority for building products and equipment standards under the Ministry of Construction. This standard was drafted by the Urban Housing Research Institute of the Ministry of Construction, Shenyang Institute of Architecture and Civil Engineering, and the Science and Technology Trade Company of the Policy Research Center of the Ministry of Construction. The main drafters of this standard are Lin Runquan, Huang Zhigang, Ma Shiming, Wang Yueren, Feng Guohui, Wang Yongbin, Zhu Hong, Liu Xin, Wang Min, Zhang Wanqing, Yin Sushan, Li Yongan, Yang Aili and Li Yongguang. The Ministry of Construction’s Urban Housing Research Institute is entrusted with the responsibility for interpreting the standard. XXS
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Construction Industry Standard of the People's Republic of China
Ventilation duct for residential kitchen1
JG/T30441998
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, transportation and storage of exhaust ducts in residential kitchens. This standard applies to vertical shared exhaust ducts in residential kitchens with gas facilities, which are prefabricated duct products made of wire mesh cement or other reinforced cement materials.
The shared exhaust duct in the bathroom can also be used for reference. 2 Referenced standards
The clauses contained in the listed standards constitute the clauses of this standard through their application in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision and parties using this standard should investigate the possibility of using the most recent versions of the following standards. GB/T175-92 Portland cement, ordinary Portland cement GB199-90 Rapid hardening Portland cement
GB/T1344-92 Slag Portland cement, pozzolanic Portland cement and fly ash Portland cement GB J119-90 Technical specification for application of ordinary concrete admixtures GBJ107-87 Concrete strength test and evaluation standard JGJ51-90 Technical specification for lightweight aggregate concrete 3 Text
This standard adopts the following definitions.
3.1 Exhaust duct is the channel for removing smoke generated by cooking activities. 3.2 The common exhaust duct connected to the branch air ducts in the kitchens on each floor at the same vertical position of the main air duct 3. β Branch air ducts are exhaust ducts that connect the range hood and the main air duct for each floor. 3.4 Main and branch air ducts, which integrate the main air duct and branch air ducts, discharge the kitchen smoke sucked by the kitchen range hoods on each floor into the main air duct through the branch air duct at the same vertical position, and then discharge the smoke into the atmosphere through the main air duct. 3.5 Air inlet: The air inlet opening where the branch air duct is discharged. 3.6 Partition plate is the partition plate between the main air duct and the branch air duct in the main branch air duct. 4: Basic dimensions
See Figure 1 for the overall dimensions and elevation of the exhaust duct, and Figure 2 for the surface view. L--the length of the exhaust duct, generally the building height, can also be divided into half the height; can also be divided into one-third of the height, mm; the outer dimension of the long side of the cross section of the exhaust duct, mm; the outer dimension of the short side of the cross section of the exhaust duct, mm; 8--the wall thickness of the exhaust duct, mm.
Approved by the Ministry of Construction of the People's Republic of China on February 9, 1998 and implemented on June 1, 1998
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Elevation Schematic Diagram
Classification and Model Compilation
Exhaust Duct Classification
Air Inlet
Exhaust duct products are classified according to cross-sectional dimensions, and their codes are shown in Table 1. Branch air duct
Main air duct
A-A cross-section
Exhaust duct products are divided into two types according to the direction of the air inlet opening, and their codes are ZYH respectively, see Figure 3. (Z is the opening direction of the left air inlet, Y is the opening direction of the right air inlet, and H is the opening direction of the side air inlet) Wall
Air inlet
Branch duct
Main air duct
Classification of exhaust duct
Branch duct
Main air duct
Air inlet
Branch duct
Main air duct
Figure 3 Schematic diagram of classification of air inlet opening directions
Table 1 Exhaust duct products are classified by cross-sectional dimensions
Pipe length (L)
Building storey height
Building storey height
Building storey height
Building storey height
Building storey height
Building storey height
Building storey height
Building storey height
Building storey height
Building storey height
Building storey height
Building storey height
Building storey height
Building storey height
Building storey height
Building storey height||tt| |Building height
Cross section (aXb)
500×300
500×280
500×250
500×350
560×300
600×300
700×400
800×400
800×500
200×20 0
250×250
300×250
380×240
Wall thickness (8)
Air inlet area (F)
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5.1.3 Code for the total number of floors of the building: 9 represents the total number of floors is nine, 6 represents the total number of floors is six, 5 represents the total number of floors is five, and so on.
5.1.4 The exhaust duct shall be coded according to the floor number on which it is installed. The codes are: 0, 12, 3, 4, ... 5.1.4.1 According to the height of the floors, the required exhaust ducts should be installed in the order of 1, 2, 3, 4, ... floors, and should be marked with the floor codes: 1, 2, 3, 4, respectively.
5.14.2 For exhaust ducts that are not installed in the order of the height of the floors, that is, the exhaust ducts can be installed arbitrarily, the code is: 0. 5.2
Exhaust duct model compilation
Code for the location of the exhaust duct installed on a certain floor
Code for the total number of floors of the building
Classification code for the direction of the air inlet opening (Z, YH) Classification code for the cross-sectional size (A, B, C, D, E, F, GJH, K, M, N, Q, R) Code for the kitchen exhaust duct
Marking example: The cross-sectional size is 500mm×280mm, the air inlet is on the right, the total number of floors of the building is six and the exhaust duct is installed on the third floor, its code is: | |tt||PCBY6-3JB/T3044
Marking example: The cross-sectional size is 500mm×300mm, the air inlet is on the left, the total number of floors of the building is five and there is no installation sequence requirement, that is, the residential kitchen exhaust duct code that needs to be installed is: PCAZ5-0JG/T3044
6 Technical requirements
6.1 Raw materials
6.1.1 Cement should be silicate cement with a grade not lower than 425, and slag silicate cement and rapid hardening silicate cement with a grade not lower than 425 can also be used. Its performance should conform to the requirements of GB/T175, GB199, GB/T1344 and GBJ107. 6.1.2 The reinforcement material should be No. 22 tortoise shell mesh or other alternative materials. The steel bars should be in the form of round bars with a diameter of 4 to 6 mm. 6.1.3 The particle size of lightweight aggregate and fine stone should not be greater than 1/3 of the exhaust duct wall thickness, and its performance should comply with the requirements of JGJ51. 6.2 Admixtures are allowed in concrete, but they must comply with the provisions of GBJ119. 6.β Appearance quality
6.3.1 The inner and outer surfaces of the exhaust duct should be smooth and free of holes. 6.3.2 Cracks are not allowed on the inner and outer surfaces of the exhaust duct, but surface cracks and shrinkage cracks in the mortar layer are not limited. 6.3.3 The inner corners of the exhaust duct should be rounded. 6.3.4 The end surface of the exhaust duct should be smooth and free of burrs. 6.3.5 Repairs are allowed for exhaust duct products with the following conditions: a) The pitting and honeycomb do not exceed 1/20 of the total area, and the area of each piece does not exceed 0.005m. b) End face damage: The depth of the partition should not exceed 10mm, the width should not exceed 20mm, the depth of the outer wall should not exceed 50mm, and the width should not exceed 100mm.
6.4 Dimensions and dimensional tolerances
6.4.1 Dimensions
The product dimensions shall comply with the provisions of Table 1. .bzsoso.Com Engineering Construction Standard Full Text Information System
6.4.2 Dimension tolerances
6.4.2.1 The allowable tolerances of exhaust duct product dimensions shall comply with the requirements of Table 2. Table 2 Allowable tolerances of exhaust duct product dimensions
Cross-section outer corridor tolerance
Note: Verticality refers to the four outer walls of the pipe body relative to the end face of the pipe body. 0
Diagonal of cross section
Verticality
6.4.2.2 The allowable error of the installation distance between the exhaust duct partition and the outer wall of the branch duct side of the pipe wall shown in Figure 2 is ±4mm. 6.5 Bearing capacity of pipe body
6.5.1 The design bearing capacity of the pipe body shall not be less than 25kN. 6.5.2
Vertical failure load of pipe body shall not be less than 38N
Test method
Bearing capacity test method of pipe body
Bearing capacity test of pipe body is the axial vertical load test of the product. 7.1.2
Bearing capacity test method of pipe body is shown in Figure 4.
1-Hydraulic jack 2-Pressure sensor; 3-Pad; 4-Exhaust duct; 5-Pad Figure 4 Simple diagram of inspection and loading
7.2 Inspection method of pipe body
7.2.1 Appearance quality inspection
Visual inspection of the inner and outer surfaces of the exhaust duct products are flat and free of holes, and visual inspection of the two end surfaces of the exhaust duct products are flat and free of burrs. 7.2.2 Dimension inspection
7.2.2.1 The length, cross-sectional outer corridor dimension, diagonal, wall thickness, verticality and straightness are measured with a steel ruler with an accuracy of 0.5mm. mm
Straightness
7.2.2.2 The straightness inspection is to place the steel plate ruler on the diagonal of the product surface and use a feeler gauge to inspect the maximum gap between the product surface and the steel plate ruler.
Verticality inspection is to place the angle ruler against the end face of the product and measure the maximum gap between the other angle ruler edge and the product surface. Crack inspection is visual inspection.
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8 Inspection Rules
8.1 Inspection Items
Manufacture inspection is divided into factory inspection and type inspection. 8.1.1 Factory inspection includes appearance quality and dimensional tolerance. 8.1.2 Type inspection includes appearance quality, dimensional tolerance and pipe body bearing capacity. 8.2 Factory inspection
8.2.1 Sampling and batching
Sampling is carried out by random sampling method according to batch. Exhaust duct products with the same specifications, the same raw materials and the same process are divided into ten batches, each batch is 1,000 pieces. When the total number of exhaust duct products is less than one batch, it is also inspected as a batch, and 5 pieces are sampled from each batch. 8.3 Type inspection
Exhaust duct products with the same specifications, the same raw materials, and the same process are considered as a batch, and each batch is 1,000 pieces. When the total number of exhaust duct products is less than one batch, it is also considered as a batch inspection, and 5 pieces are sampled from each batch. 8.3.1 Type inspection should be carried out in any of the following situations: a) Production finalization identification of new products (or conversion of old products); b) After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c) In normal production, regular inspection or after a certain number of products have been accumulated, it should be inspected periodically; d) After the product has been discontinued for more than half a year and resumed production, e) When the factory inspection results are significantly different from the previous type inspection; f) When the national quality supervision agency proposes a requirement for type inspection; g) When each length specification of products has been produced continuously for half a year or the cumulative number reaches 20,000. 8.3.2
Dimension and dimensional tolerance inspections shall comply with the provisions of 6.4.1 and 6.4.2. Appearance quality inspection shall comply with the provisions of 6.3 and 7.2.1. The pipe body bearing capacity test shall be carried out in accordance with 6.5 and 7.1. 8.4.1 Qualified products: All unit products that meet the indicators specified in 6.3.1 to 6.3.5, have minor defects within the allowable repair range, and whose dimensional tolerances meet the conditions in Table 2 of 6.4.2.1 and the pipe body bearing capacity meets the design requirements shall be accepted as qualified products. 9 Marking, transportation, purchase and storage
Marking and factory certificate
9.1.1 Product marking
9.1.1.1 Mark the model, variety, manufacturing date and manufacturer on the outer surface of the product. The marking includes the following contents: 1) Manufacturer name;www.bzxz.net
2) Product code:
3) Product production date.
9.1.1.2 The mark should be sprayed or handwritten on the upper part of the exhaust duct inlet, 100mm away from the upper edge of the air inlet. For example: Beijing Housing Equipment Products Industry Company PCBY6-3 Excellent 19X× Year × Month ×× Day Manufacturing 9.1.1.3 Draw a symbol on the outer surface of the product above the air inlet in the middle of the exhaust duct according to the air flow direction in the exhaust duct: "". 9.1.2 Factory Certificate
All products that are allowed to leave the factory after passing the inspection should be filled in with the factory certificate. Its content should include: a) Certificate number;
b) Manufacturer name and manufacturing date;
c) Product specifications and quantity;
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d) Appearance size test results,
e) Pipe body bearing capacity (for type inspection); f) Seal of the manufacturer's inspection department, signature and seal of the inspector. 9.2 Transportation
When using various transportation tools to transport exhaust duct products, they must be fixed to reduce vibration and prevent collision during transportation. They should be lifted and placed gently during loading and unloading, and throwing is strictly prohibited.
9.3 Storage
The stacking site of exhaust duct products must be solid and flat, and ventilation ducts of different specifications should be stacked separately. The stacking height shall not exceed 2m. V88
bzsoso,co3 Type inspection
Exhaust duct products with the same specifications, the same raw materials, and the same process are considered as a batch, and each batch is 1,000 pieces. When the total number of exhaust duct products is less than one batch, it is also considered as a batch inspection, and 5 pieces are sampled from each batch. 8.3.1 Type inspection should be carried out in any of the following situations: a) Production finalization identification of new products (or conversion of old products); b) After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c) In normal production, regular inspection or after a certain number of products have been accumulated, it should be inspected periodically; d) After the product has been discontinued for more than half a year and resumed production, e) When the factory inspection results are significantly different from the previous type inspection; f) When the national quality supervision agency proposes a requirement for type inspection; g) When each length specification of products has been produced continuously for half a year or the cumulative number reaches 20,000. 8.3.2
Dimension and dimensional tolerance inspections shall comply with the provisions of 6.4.1 and 6.4.2. Appearance quality inspection shall comply with the provisions of 6.3 and 7.2.1. The pipe body bearing capacity test shall be carried out in accordance with 6.5 and 7.1. 8.4.1 Qualified products: All unit products that meet the indicators specified in 6.3.1 to 6.3.5, have minor defects within the allowable repair range, and whose dimensional tolerances meet the conditions in Table 2 of 6.4.2.1 and the pipe body bearing capacity meets the design requirements shall be accepted as qualified products. 9 Marking, transportation, purchase and storage
Marking and factory certificate
9.1.1 Product marking
9.1.1.1 Mark the model, variety, manufacturing date and manufacturer on the outer surface of the product. The marking includes the following contents: 1) Manufacturer name;
2) Product code:
3) Product production date.
9.1.1.2 The mark should be sprayed or handwritten on the upper part of the exhaust duct inlet, 100mm away from the upper edge of the air inlet. For example: Beijing Housing Equipment Products Industry Company PCBY6-3 Excellent 19X× Year × Month ×× Day Manufacturing 9.1.1.3 Draw a symbol on the outer surface of the product above the air inlet in the middle of the exhaust duct according to the air flow direction in the exhaust duct: "". 9.1.2 Factory Certificate
All products that are allowed to leave the factory after passing the inspection should be filled in with the factory certificate. Its content should include: a) Certificate number;
b) Manufacturer name and manufacturing date;
c) Product specifications and quantity;
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d) Appearance size test results,
e) Pipe body bearing capacity (for type inspection); f) Seal of the manufacturer's inspection department, signature and seal of the inspector. 9.2 Transportation
When using various transportation tools to transport exhaust duct products, they must be fixed to reduce vibration and prevent collision during transportation. They should be lifted and placed gently during loading and unloading, and throwing is strictly prohibited.
9.3 Storage
The stacking site of exhaust duct products must be solid and flat, and ventilation ducts of different specifications should be stacked separately. The stacking height shall not exceed 2m. V88
bzsoso,co3 Type inspection
Exhaust duct products with the same specifications, the same raw materials, and the same process are considered as a batch, and each batch is 1,000 pieces. When the total number of exhaust duct products is less than one batch, it is also considered as a batch inspection, and 5 pieces are sampled from each batch. 8.3.1 Type inspection should be carried out in any of the following situations: a) Production finalization identification of new products (or conversion of old products); b) After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c) In normal production, regular inspection or after a certain number of products have been accumulated, it should be inspected periodically; d) After the product has been discontinued for more than half a year and resumed production, e) When the factory inspection results are significantly different from the previous type inspection; f) When the national quality supervision agency proposes a requirement for type inspection; g) When each length specification of products has been produced continuously for half a year or the cumulative number reaches 20,000. 8.3.2
Dimension and dimensional tolerance inspections shall comply with the provisions of 6.4.1 and 6.4.2. Appearance quality inspection shall comply with the provisions of 6.3 and 7.2.1. The pipe body bearing capacity test shall be carried out in accordance with 6.5 and 7.1. 8.4.1 Qualified products: All unit products that meet the indicators specified in 6.3.1 to 6.3.5, have minor defects within the allowable repair range, and whose dimensional tolerances meet the conditions in Table 2 of 6.4.2.1 and the pipe body bearing capacity meets the design requirements shall be accepted as qualified products. 9 Marking, transportation, purchase and storage
Marking and factory certificate
9.1.1 Product marking
9.1.1.1 Mark the model, variety, manufacturing date and manufacturer on the outer surface of the product. The marking includes the following contents: 1) Manufacturer name;
2) Product code:
3) Product production date.
9.1.1.2 The mark should be sprayed or handwritten on the upper part of the exhaust duct inlet, 100mm away from the upper edge of the air inlet. For example: Beijing Housing Equipment Products Industry Company PCBY6-3 Excellent 19X× Year × Month ×× Day Manufacturing 9.1.1.3 Draw a symbol on the outer surface of the product above the air inlet in the middle of the exhaust duct according to the air flow direction in the exhaust duct: "". 9.1.2 Factory Certificate
All products that are allowed to leave the factory after passing the inspection should be filled in with the factory certificate. Its content should include: a) Certificate number;
b) Manufacturer name and manufacturing date;
c) Product specifications and quantity;
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d) Appearance size test results,
e) Pipe body bearing capacity (for type inspection); f) Seal of the manufacturer's inspection department, signature and seal of the inspector. 9.2 Transportation
When using various transportation tools to transport exhaust duct products, they must be fixed to reduce vibration and prevent collision during transportation. They should be lifted and placed gently during loading and unloading, and throwing is strictly prohibited.
9.3 Storage
The stacking site of exhaust duct products must be solid and flat, and ventilation ducts of different specifications should be stacked separately. The stacking height shall not exceed 2m. V88
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