Some standard content:
JG/T14—1999
According to the requirements of the State Bureau of Quality and Technical Supervision's "Notice on the Abolition of Professional Standards and National Standards to be Transformed after Rectification" (No. 216 of the Bureau of Quality and Technical Supervision (1998)), the Ministry of Construction has cleaned up, rectified and reviewed the national standards approved by the State Bureau of Technical Supervision in 1992 for the Ministry of Construction to be converted into industry standards and the product standards approved and issued by the Ministry of Construction before 1992. The Ministry of Construction confirmed and issued the JGJ77—91 "Ventilation and Air Conditioning Ventilation" standard with the document "Notice on the Announcement of the Results of the Rectification of the Ministry of Construction's Product Standards" (Jianbiao (1999) No. 154), and the new number is JG/T14—1999. In order to facilitate the implementation of the standard, only the cover, first page, and the above-the-margin statement of the original standard are modified accordingly, and this explanation is added and reprinted, and the original standard version is abolished at the same time. 1583
Construction Industry Standard of the People's Republic of China Air outlets and inlets for ventilation and air conditioning Subject content and scope of application
JG/T 14—1999
This standard specifies the classification, basic specifications, technical requirements, test methods, inspection rules and markings, packaging, transportation, storage, etc. of ventilation and air conditioning air outlets (referred to as air outlets).
This standard applies to all types of air outlets and inlets in ventilation and air conditioning systems. Other products with similar uses can also refer to this standard. 2 Reference standards
GB8070 Test method for performance of air distributors GB321 Priority numbers and priority number series
GB5237 Aluminum alloy building profiles
GB11253 Cold-rolled thin steel plates and strips of carbon structural steel and low-alloy structural steel GB8170 Numerical rounding rules
3 Classification and basic specifications
3.1 Classification
3.1.1 Classification by purpose:
a. Air outlet,
b. Air inlet.
3.1.2 Classification by type:
a. Louver air outlet: the shape is square, rectangular, and circular; the blades are single-layer, double-layer, etc.; b. Diffuser: round, square, rectangular, disc-shaped, etc.; C. Nozzle: round, rectangular, spherical, etc.; d. Slit type air outlet: single slit, double slit and multiple slits, etc.; e. swirl air outlet;
f. orifice air outlet (including mesh air outlet); g. special air outlet: such as chair air outlet, lamp air outlet, grate air outlet, grille air outlet, etc. 3.2 Basic specifications
3.2.1 The basic specifications of air outlets are expressed by neck size (referring to the interface size with the air duct) and arranged according to the requirements of GB321, see Table 1 and Table 2 for details.
Diameter D
Specification code
Diameter D
Specification code
Approved by the Ministry of Construction of the People's Republic of China on 1999-06-04 1584
Basic specifications for circular air outlets
Implementation on 1999-06-04
Specification code
Height H
Width W
JG/T 14—1999
Basic specifications for square and rectangular air outlets
32124012
3.2.2 The basic specifications of diffusers can be arranged at equal intervals of 50mm, 60mm and 70mm. 3.3 Model Notation
3.3.1 Model Notation
Specification Code
Classification Code: in Chinese Pinyin
8 012|10 012
1001612516
1003212532bzxz.net
1004012540
Alphabetic representation (see Table 3)
Air outlet code
Table 3 Classification code table
Air outlet name
Single-layer louver air outlet
Double-layer louver air outlet
Circular diffuser
Square diffuser
Rectangular diffuser
Disc diffuser
Circular nozzle
Rectangular nozzle
Spherical nozzle
Classification code
Note: The specification code is expressed by 1/10 of the basic specification value of the air outlet. 3.3.2 Model example:
FJS-3225
indicates a rectangular diffuser with a specification of 320mm×250mmFQP-16
Name of air outlet
Slit air outlet
Swirl air outlet
Orifice air outlet
Mesh air outlet
Chair air outlet
Lamp air outlet
Hole air outlet
Grille air outlet
100 6312563
Classification code
Indicates spherical nozzle, specification is 160mm
FYS-25
Indicates circular diffuser, specification is 250mm
4 Technical requirements
4.1 Basic requirements
JG/T14—1999
4.1.1 Air outlet products shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 4.1.2 The allowable values of dimensional deviation are as follows:
a. The dimensional tolerance of rectangular (including square) air outlets is shown in Table 4. Table 4 Dimensional tolerance
Air outlet side length
300~800
b. The tolerance between the two diagonals of rectangular (including square) air outlets is shown in Table 5. Table 5 Tolerance between two diagonals
Length of diagonal
The size tolerance of circular air outlet is shown in Table 6.
Diameter of air outlet
300~500
Table 6 Size tolerance
4.1.3 The decorative surface of the air outlet should be flat and smooth, and its flatness should meet the specified values in Table 7. Table 7 Flatness
Surface area, m2
Flatness, mm
>0.3,≤0.8
4.1.4 The gap of the joint joint on the decorative surface of the air outlet should not exceed 0.15mm for aluminum profiles and 0.2mm for other materials. 4.1.5 The blades of the air outlet should meet the following requirements: a. The size deviation of the blade spacing should not exceed ±1mm; b. The curvature of the blade is 3/1000mm;
c. The parallelism of the blade is 4/1000mm.
4.2 Appearance requirements
4.2.1 The decorative surface of the air outlet should be free of obvious scratches and indentations. 4.2.2 The color of the decorative surface of the air outlet should be consistent and without mottled phenomenon. 4.2.3 The welding points should be smooth and firm.
4.3 Performance requirements
4.3.1 Mechanical properties
a. The movable parts of the air outlet should move freely, have uniform damping, and no stuck or loose. b. Products with adjustable or detachable guide vanes should be easy and reliable to adjust and disassemble, and no looseness after positioning. 4.3.2 Aerodynamic performance
a. The rated air volume and range values of the air outlet under standard test conditions should be determined. The standard test conditions are: under standard state air, the terminal velocity of the jet is 0.5m/s, and the total air pressure is 10Pa. 1586
JG/T 14 - 1999
b. When the speed of the tuyere at the neck is 6m/s, the total pressure loss shall not exceed 100Pa. c. The values of aerodynamic performance shall comply with the numerical rounding rules of GB8170. The air volume shall be rounded to an integer with a zero decimal; the range (or diffusion radius) and pressure loss shall be rounded to one decimal place, and the local resistance coefficient shall be rounded to two decimal places. 4.4 Material requirements
The tuyere shall be made of materials with good corrosion resistance and easy to form. a. When aluminum profiles are used, they shall comply with the provisions of GB5237. b. When steel is used, they shall comply with the provisions of GB11253. C. Other materials may also be used according to the requirements of use. However, they shall meet the strength and durability requirements of the tuyere and shall comply with the provisions of relevant material standards.
Test method
5.1 Aerodynamic performance test
The aerodynamic performance of the air outlet shall be tested in accordance with the test items, devices and methods specified in GB8070. 5.2 Dimension measurement
The various dimensions and deviations of the air outlet shall be measured with a steel ruler, feeler gauge or sample. 5.3 Appearance inspection
The appearance inspection shall be carried out visually under an illumination of not less than 300 1x. 5.4 Mechanical performance inspection
It shall be inspected by hand or with special tools (such as sample) under normal use conditions. 5.5 Transportation test
After the packaged air outlet is stably placed on a truck (the truck travels 300km on a third-class highway at a speed of 25-30km/h) or shaken on a simulated vibration table, the dimensional deviation, appearance and mechanical performance shall be re-measured. 6 Inspection rules
6.1 Inspection categories and inspection items
6.1.1 Air vent inspection is divided into factory inspection (or delivery inspection) and type inspection. 6.1.2 Inspection items are as per Table 8.
Table 8 Inspection items for air inlets
Note: Item 6 does not need to be inspected for air inlets.
Name of inspection item
Dimensional deviation
Mechanical properties
Pressure loss and local resistance coefficient
Range (or diffusion radius)
Transportation test
Packaging, marking
Clause of this standard
4.1.2~4.1.5
4.2.1~~4.2.3
4.3.1 and 5.4
4.3.2 and 5.1
4.3.2 and 5.1
4.3.2 and 5.1
6.2 Factory inspection
JG/T 14 1999
6.2.1 Each air outlet must be inspected and qualified by the inspection department of the manufacturer, and can only leave the factory with a quality inspection certificate. 6.2.2 The factory inspection of air outlets should generally be carried out item by item according to the contents of 1, 2, 3, and 8 in Table 8. Only after passing the inspection can they be put into the warehouse. 6.3 Type inspection
6.3.1 Type inspection should be carried out when the air outlet has one of the following conditions: a. When the new product produced by trial production is finalized;
b. When the product structure, manufacturing process, materials, etc. are changed, which have an impact on product performance; c. When production is resumed after a long period of suspension;
d. When the product is transferred to another factory for production;
e. In mass production, it should be carried out at least once every two years; f. When the national quality supervision agency puts forward type inspection requirements. 6.3.2 Type inspection of air outlets should include all items in Table 8. 6.3.3
Type inspection sampling method: samples should be drawn from qualified products of the manufacturer. The number of samples to be drawn shall be in accordance with Table 9. Table 9 Number of samples to be inspected
Number of samples to be inspected
Number of samples to be inspected
100~500
6.3.4 Judgment rule: if one of the samples fails the inspection, double the number of samples to be drawn. If there is still one sample that fails the inspection, the batch of tuyere shall be judged as unqualified products.
7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Each product shall have the manufacturer's trademark and be fixed in a conspicuous position. 7.1.2 The packaging box of the product shall indicate: a. Name, trademark or code of the tuyere;
b. Name of the manufacturer;
c. Model and specification of the tuyere;
d. Factory number;
e. Date of manufacture;
f. Quantity and weight.
7.1.3 The packaging box should be marked with signs such as moisture-proof, anti-expansion, no rolling, and handle with care. 7.2 Packaging
7.2.1 Each product should be wrapped with a plastic bag or other protective materials. 7.2.2 The wrapped products should be laid flat in the carton and padded with soft materials. The packaging cartons must be tied tightly and firmly. 7.2.3 The packaging box should contain relevant documents such as packing list and product certificate. 7.3 Transportation and storage
7.3.1 The products should not be hit, squeezed, thrown, or exposed to rain or snow during transportation. 7.3.2
The products should be stored in a ventilated and dry warehouse. They should not be stacked too high, and there should be no corrosive gas around. 1588
Additional Notes:
This standard was proposed by the Standard and Norm Research Institute of the Ministry of Construction. This standard is under the jurisdiction of the China Academy of Building Research. JG/T14—1999
This standard was drafted by the China Academy of Building Research, Beijing Equipment Installation Engineering Company, Beijing Qingyun Instrument Factory, and Shaanxi Equipment Installation Engineering Company.
The main drafters of this standard are Zou Yueqin, Peng Rong, Wang Fusheng, Ma Jiafu, and Yan Xiling. This standard is entrusted to the China Academy of Building Research for interpretation. 1589
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