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GB 6932-2015: Domestic gas instantaneous water heater
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Basic data | Standard ID | GB 6932-2015 (GB6932-2015) | | Description (Translated English) | Domestic gas instantaneous water heater | | Sector / Industry | National Standard | | Classification of Chinese Standard | Y69 | | Classification of International Standard | 97.120 | | Word Count Estimation | 108,123 | | Date of Issue | 2015-09-18 | | Date of Implementation | 2017-01-01 | | Older Standard (superseded by this standard) | GB 6932-2001 | | Quoted Standard | GB/T 191; GB/T 2828.1; GB/T 2828.2; GB/T 3280; GB 4208; GB 4706.1-2005; GB/T 5013.1; GB/T 5023.1; GB/T 5465.2; GB/T 7306.1; GB/T 7306.2; GB/T 7307; GB/T 12113-2003; GB/T 12206-2006; GB/T 13611; GB 14536.1; GB 14536.6; GB/T 16411-2008; GB/T 17624.1; GB/T 17626.4; GB/T 17626.5; GB/T 17626.11; GB/T 17627.1; GB/T 17799.1-1999; GB 19212.10; CJJ 12 | | Regulation (derived from) | National Standard Announcement 2015 No.28 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the terms and definitions of domestic gas instantaneous water heater, classification and type, material and structural requirements, performance requirements, test methods, inspection rules and signs, installation, packaging, transportation and storage. This standard applies to the rated thermal load of not more than 70 kW of home heating water gas instantaneous water heater (hereinafter referred to as hot water heaters); rated thermal load of not more than 70 kW, maximum working pressure heating is not greater than 0.3 MPa, the heating temperature of not more than indoor forced to exhaust, home heating outdoor gas water heater (hereinafter referred to as heating water heater) and household dual-use gas water heater 95 �� (hereinafter referred to as the rejection of two water heaters), including condensing heating water heaters, heating particular requirements for dual-use water heaters and water heaters. This standard does not apply for a gas storage water heater. | GB 6932-2015: Domestic gas instantaneous water heater---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Domestic gas instantaneous water heater
ICS 97.120
Y69
National Standards of People's Republic of China
Replacing GB 6932-2001
Domestic gas instantaneous water heaters
Published 2015-09-18
2017-01-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China issued
Table of Contents
Introduction Ⅲ
1 Scope 1
2 Normative References 1
2 3 Definitions
Category 4 and 5 models
5 Materials and structural requirements 12
6 performance requirements 18
7 22 Test Method
56 8 Inspection Rules
9 flag, installation, packaging, transportation, storage 58
Particular requirements Annex A (normative) heating domestic gas water heater, a home dual type gas water heater 62
Particular requirements Annex B (normative) condensing water heater 72
Annex C (normative) using an alternating current electrical safety heater 79
Annex D (normative) safety and electromagnetic compatibility of electronic control system 88 controls the requirements
Annex E (normative) food content of nitrogen oxides in the combustion flue gas φ [NOx (α = 1)] Grading Rules 93
Annex F (normative) mounting technique requires heater 95
Effects of intrinsic thermal heat loss (normative) indirect method and test device Appendix G of the circulation pump 99
The method of Annex H (normative) determining the ignition time at full load of 100
Foreword
This standard Chapter 5 5.1.6.1,5.1.6.2,5.2.2.2.1,5.2.2.8.1,5.2.2.8.2,5.2.2.9.1,5.2.3.1.1,5.2.3.2.1 ,
Item 5.2.3.3.1,5.2.3.4.1, Chapter 6 boldface in Table 6, Chapter 8 of 8.4.1.1, 9.1.1 in Chapter 9 of b), 9.1.2 of
Item a),) item b, item c), 9.4.1, Appendix A A.2.2.2 of item a) item, b), the term A.2.2.3 b), A.2.3.1, A.2.3.2.3 of a)
Xiang, boldface Table A.1, Appendix B Table B.1 boldface, Appendix C C.2.1, C.2.2, C.7.4 to the bold C.7.1
Portion, boldface bold portion of C.9.1 to C.9.3, C.13.1 to C.13.11 of the bold portion C.14.1 to C.14.5,
Appendix F boldface items F.4.1.1, F.4.1.2, F.4.1.4 and first paragraph a) are mandatory, others are recommended.
This standard was drafted in accordance with rules GB/T 1.1-2009 given.
The standard reference JISS2109.2008 "Gas Water Heater", EN26.1998 "Installation atmospheric household gas burner fast
Fast food "(Amendments comprising 2 and 3).
This standard replaces GB 6932-2001 "Domestic gas instantaneous water heaters."
Compared with this standard GB 6932-2001, except for editorial changes Technical changes are as follows.
--- modified natural structure and the exhaust gas water heater installation requirements (see 5.1.6.1,5.1.6.2,5.2.2.8.1, F.4.1.1);
--- Natural increased water heater exhaust safety device to prevent incomplete combustion (see 5.2.3.3);
--- on the part concerning the structure and use of safe water heaters were perfect (see 5.1.1,5.1.2,5.1.5,5.2.3);
--- increase the gas/air ratio control apparatus according (see 5.2.2.11);
--- standard performance requirements, test methods were perfect (see Chapter 6, Section 7);
--- for domestic heating gas instantaneous water heaters, household gas instantaneous water heater dual-use part of the contents have been revised and improved (see Appendix A);
--- special requirements for increased condensing water heater (see Appendix B);
--- improve the safe use of alternating current electric water heater (see Appendix C);
--- improved electromagnetic compatibility and safety of electronic control systems control requirements (see Appendix D).
This standard, under the jurisdiction of China National Hardware Association, China Association for Standardization.
This standard was drafted. Guangdong Macro Gas Appliance Co., Ltd., Qingdao Economic and Technological Development Zone Haier Water Heater Co., the country burning
Gas appliances Quality Supervision and Inspection Center (Foshan), the national daily Metal Products Quality Supervision and Inspection Center (Shenyang), national gas appliances Quality Supervision
Inspection Center (Tianjin), Zhongshan Vantage Gas Appliance Co., Ltd., the rate of energy (China) Investment Co., Ltd., Guangdong million and the new Electric Company Limited
Secretary, AO Smith (China) Water Heater Co., Ltd., Guangdong Shenzhou Gas Appliances Co., Ltd., Sakura (China) Co., Ltd., to
Are forward Electronics Co., Ltd., the highest Stewart Thermal Technology (Zhongshan) Co., Ltd., Guangdong Midea Electric Manufacturing Co., Ltd. kitchen, Guangdong gold
Mita Industrial Co., Ltd., Guangdong Hesheng Metal Manufacturing Co., Ltd., Shanghai Rinnai Co., Ltd., Ningbo, too kitchenware Ltd., Zhongshan Decker
Kitchen & Bath Co., Ltd., Zhongshan City, Sakura Ice Holdings Limited, Ariston Thermo Products (China) Co., Ltd., Zhejiang German, Italian and kitchen utensils Limited.
The main drafters. Shao Yan, Hu set steel, Zheng Tao, Zhang Mingwei, Jin Feng, Liu Tong, Yi Hongbin, Zhang Kundong, Zhong Song, Qiu step,
Li Jianhao, Huang Jin, Yang Gang, Zhang Jixiang, Liang Guorong, Zhu Baohua, six Tan Ming, Jiang Hua, Xu Deming, Guo Li, Zhou Yulin, quarter soldiers, Pu Xi An.
This standard supersedes the previous editions are.
--- GB 6932-1994, GB 6932-2001.
Domestic gas instantaneous water heaters
1 Scope
This standard specifies a domestic gas water heater terms and definitions, and the classification models, materials and structural requirements, performance requirements, Standard Test
Method, inspection rules and signs, installation, packaging, transportation and storage.
This standard applies to domestic gas water heater hot-water supply load is not greater than the nominal heat of 70kW (hereinafter referred to as hot water heaters);
Nominal heat is not greater than 70kW, working pressure is not greater than the maximum heating 0.3MPa, heating temperature not greater than 95 deg.] C to room Forced
Vent type, home heating outdoor gas instantaneous water heater (hereinafter referred to as heating water heater) and a dual-type household gas instantaneous water heater (hereinafter
Said dual heater), heating comprising condensing water heaters, water heaters, and heating heaters dual specific requirements.
This standard does not apply to gas storage water heater.
Note 1. This standard gas referred to is GB/T 13611 "town gas classification and basic characteristics", a predetermined gas GB 13612 "artificial gas", using the GB/T 13611
When outside a predetermined gas, a gas test was carried out with gas provided by the product design, the relevant pressure range with reference to a predetermined GB/T 13611's.
Note 2. domestic gas water heater hot-water supply, heating domestic gas water heater, dual-type gas water heater household collectively domestic gas heat
Water (hereinafter referred to as heater).
2 Normative references
The following documents for the application of this document is essential. For dated references, only applies to the version dated paper
Pieces. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 191 Packaging Pictorial signs
GB/T 2828.1 Sampling procedures - Part 1. press-batch inspection sampling plan reception quality limit (the AQL) search
GB/T 2828.2 Sampling procedures - Part 2. Test batch sampling plan isolated by limiting quality (LQ) search
GB/T 3280 cold rolled steel and stainless steel
GB 4208 shell protection (IP code)
Part 1 GB 4706.1-2005 Safety of household and similar electrical appliances. General requirements
GB/T 5013.1 rated voltage of 450/750V and Rubber insulated cables - Part 1. General Requirements
GB/T 5023.1 rated voltage of 450/750V and below PVC insulated cables - Part 1. General Requirements
GB/T 5465.2 electrical equipment Graphical symbols Part 2. Graphical symbols
GB/T 7306.1 55 ° pipe thread seal Part 1. the inner cylinder and the taper thread external thread
GB/T 7306.2 55 ° pipe thread seal Part 2. Taper internal and the external threads
GB/T 730755 ° non-sealing pipe thread
GB/T 12113-2003 touch current and protective conductor current measurement
GB/T 12206-2006 town gas heating value and relative density of
GB/T 13611 Classification and essential property of city gas
GB 14536.1 household and similar use automatic controller Part 1. General Requirements
GB 14536.6 household and similar use electrical burner automatic controller automatic control system specific requirements
GB/T 16411-2008 domestic gas appliances General Test Method
GB/T 17624.1 Electromagnetic compatibility General EMC basic terms and definitions apply to the interpretation
GB/T 17626.4 Electromagnetic compatibility testing and measurement techniques Electrical fast transient burst immunity test
GB/T 17626.5 Electromagnetic compatibility testing and measurement techniques surge (impact) immunity test
GB/T 17626.11 Electromagnetic compatibility Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests
GB /17627.1 first portion of the high voltage test techniques for low voltage equipment T. Definitions and test requirements
GB/T 17799.1-1999 Electromagnetic compatibility - Generic standards Immunity for residential, commercial and light industrial environments
GB 19212.10 transformers, reactors, power supply devices, and combinations Safety Part 10. Ⅲ portable type for filament transformer
Particular requirements and test power supply unit and
CJJ12 domestic gas burning appliances installation and acceptance
3 Terms and Definitions
GB 4706.1-2005, GB/T 13611, GB 14536.1, GB 14536.6, GB/T 16411-2008, GB/T 17624.1 defined
The following terms and definitions apply to this document.
3.1
Switch having a control linkage moisture gas combustion, utilizing the heat of combustion of the rapid heating device by the water flowing inside the heat exchanger.
3.2
Low calorific value netcalorificvalue
Q1
Under the standard condition 1m3 (or 1kg) complete combustion gas heat released, latent heat of the water vapor does not include the heat released.
3.3
Water temperature fluctuations temperaturefluctuation
In the case where the water and the set water temperature remains constant, the difference between the maximum and minimum temperature of hot water.
3.4
Apply pressure appliedwaterpressure
Water relative maximum and minimum values of the static pressure of the water heater can withstand normal operating manufacturer nameplate.
3.5
Heat load (heat flux) heatinput
The fuel combustion heat released per unit time in the burner, i.e., the product gas of low heating value and the volume flow in the same state.
3.6
Nominal heat load (heat flux nominal) ratedheatinput
Heat load under a predetermined reference atmospheric conditions. This value is the nominal value of the product nameplate, unit of kW (1kW = 3.6MJ/h).
3.7
Minimum heat load (minimum heat flux) minimumheatinput
At a nominal gas pressure, thermal load is minimal when operating gas flow conditions.
3.8
Gas supply pressure gassupplypressure
In the gas inlet of the water heater, measured relative static pressure at runtime.
3.9
Thermal efficiency thermalefficiency
Effective use of incomplete combustion gas heat accounted for a percentage of the total heat release.
3.10
Hot water production capacity hotwaterproductioncapacity
0-2 gas condition, water heater at maximum heat load state, the water pressure was 0.1MPa, the conversion temperature Δt = 25K
Hot water per minute out of time.
3.11
Rated output hot water capacity ratedproductioncapacityofhotwater
Product nameplate nominal value, hot water production capacity given by the manufacturer.
3.12
Water pressure watersupplypressure
Measured at the inlet of a relative static pressure in normal use.
3.13
Flame-flamelift
Burner flame from the fire hole to leave all or part of the phenomenon.
3.14
Tempering lightback
Flame inside the burner ignites.
3.15
Huang Yan yelowflame
(Contact with the cold body) to form a yellow flame at the top of the combustion flame cone.
3.16
Deflagration explosivecombustion
After the dramatic phenomenon of combustion gas and air mixing, combustion noise exceeds 85dB.
3.17
Flame stability flamestability
Flame characteristics within the combustion region of the flame at the burner fire holes either from the flame, nor tempering.
3.18
Ignition burner permanentpilot
For igniting the main burner of the burner, and does not go out during the standby operation allows the burner.
3.19
Main fire burner mainburner
Runtime heater for heating water combustor.
3.20
Flameout protection device flamefailuredevice
When the flame is extinguished, the gas passage means of an automatic cut off.
3.21
Re-ignition automaticre-igniter
Ignition or ignition of the main flame burners extinguished, without completely closing the gas supply is automatically re-ignition function.
3.22
Safety device to prevent incomplete combustion incompletecombustionpreventivedevice
Emission of combustion products reaches a preset threshold, automatically cut off the gas supply means.
3.23
Water vapor linkage watersection
When the water flow or water pressure is higher than the set value of the flow of water gas supply passage is opened, or when the pressure lower than the set water flow off
The off gas passage means.
3.24
Anti-dry safety device anti-drysafetydevice
When the water heater temperature rises, before the appliance can cause damage or accidents, automatically cut off the gas supply means.
3.25
Gas/air ratio control means gas/airratiocontrol
Automatically adjusted according to the combustion air flow rate gas flow, gas flow, or automatically adjusted according to the combustion air flow rate pneumatic proportional control
Device.
3.26
Anti-downdraft exhaust hood draughtdiverter
The flue gas outlet, means downdraft combustion properties of the burner to reduce.
3.27
Sealing structure room-sealedshel
Water heater system and the exhaust system and the combustion air separation chamber housing structure.
3.28
Gas regulator means gasgovernor
Nozzle means before the gas pressure in the gas passage stabilized.
3.29
Combustion chamber combustionchamber
Wherein the combustion gas in the cavity and connected to the heat exchanger.
3.30
Exhaust system exhaustsystem
The product discharged from the combustion system (including the exhaust pipe, anti-down wind means, hood, to exhaust pipes, fans and other parts).
3.31
Standard state standardcondition
Temperature is 0 ℃, an absolute gas pressure in a dry state under conditions of 101.3kPa.
3.32
Reference state referencecondition
Temperature was 15 ℃, the absolute gas pressure in a dry state under conditions of 101.3kPa.
3.33
Found conversion heat load convertedactualheatinput
Under test conditions, the water heater heat flow when using the test gas converted to a value in the reference state.
3.34
Under the conditions specified in this reference, the use of the heat generated by gas combustion, direct heating of the water flowing through the heat exchanger, and using add
Hot water heat exchanger for heating, hot water and heating or dual-function appliance.
3.35
Condensing water heater condensingwaterheater
Under the conditions specified in this reference, the combustion product vapor is partially condensed and the heat released during condensation is part of a
Household water heaters condensing heating efficient use of condensing heating household water heaters, water heaters dual condensing household.
3.36
Condensate condensate
Condensed liquid product condensate formed during combustion.
4 Classification and model
4.1 Classification
4.1.1 The use gas type heater, and the mounting position to the exhaust mode, the intended use, the heating hot water circulation means for categorizing.
4.1.2 divided by type of gas used. artificial gas water heaters, gas heaters, water heaters LPG. Classification of various gas
Code and the rated supply pressure are shown in Table 1.
Table 1 Gas Category
Code Type of gas Rated gas supply pressure/Pa
Artificial gas 3R, 4R, 5R, 6R, 7R 1000
natural gas
3T, 4T, 6T 1000
10T, 12T 2000
LPG 19Y, 20Y, 22Y 2800
4.1.3 installation position and by way of the exhaust gas to the classification shown in Table 2.
Table 2 and to the mounting position of the exhaust way classification
Code Name schematic classification of content referred to
Natural exhaust type
From the combustion chamber when the air required by the exhaust pipe from
However, the suction force of the flue gas to the outside row
Flue D in FIG. 1
Forced exhaust
When combustion air is taken from the desired chamber, through the action of the fan under
Forced through the flue gas exhaust pipe to the outside row
Q strong emission FIG. 2a), b)
Natural to exhaust
Will exhaust pipe connected to the outdoor use of natural suction force chamber
External air supply and exhaust fumes to the outside
P balanced FIG 3a)
Forced to exhaust
An exhaust pipe connected to the outdoor will by forcing blower chamber
External air supply and exhaust fumes to the outside
G forced to exhaust FIG. 3b)
FIG outdoor food Outdoor W can only be installed outdoors 4
FIG indoor NATURAL vent type 1
a) blowing type b) the wind type
FIG 2 Indoor forced exhaust
a) natural to exhaust b) forced to exhaust
FIG 3 Indoor nature to exhaust, forced to exhaust
4 Outdoor
4.1.4 Table 3 by use classification.
Table 3 use classification
Code schematic use categories using
Type hot water supply for hot water supply is only JS
JN heating type for heating only FIG. 5, FIG. 6
Dual-type heating and hot-water supply dual JL FIG. 7, FIG. 8
5 Open-heating
FIG 6 closed heating type
FIG dual open-7
FIG dual type hermetic 8
4.1.5 hot water circulation in the heating mode classification Table 4.
Table 4 heating hot water circulation way classification
Round-robin fashion content classification code schematic
Open water heater heating the atmosphere circulating passage K in FIG. 5, FIG. 7
Closed heating heater circulation passage to the atmosphere B of FIG. 6, FIG. 8
4.2 Model
4.2.1 Model Type
Type hot-water heater is divided into food, heating, dual heater, condensing water heater.
4.2.2 hot water heater models
4.2.2.1 constitute
4.2.2.2 Code
JS --- represents domestic hot water gas instantaneous water heater for heating water.
4.2.2.3 installation position and to exhaust mode
D --- Natural exhaust type;
Q --- forced exhaust;
P --- Natural to exhaust;
G --- forced to exhaust;
W --- Outdoor.
4.2.2.4 main parameters
The rated thermal load (kW) digits after rounding.
4.2.2.5 Characteristics No.
We designed by the manufacturer, the number of bits is not limited.
Example.
4.2.3 heating, water heaters, dual-use model
4.2.3.1 constitute
4.2.3.2 Code
JN --- represents a heating home heating gas water heater;
JL --- represents a domestic hot water heating and dual-use gas water heater.
4.2.3.3 installation position and to exhaust mode
With 4.2.2.3.
4.2.3.4 cycle way
K --- open;
B --- closed.
4.2.3.5 main parameters
The rated heat input (kW) after taking the whole digit.
4.2.3.6 Characteristics No.
We designed by the manufacturer, the number of bits is not limited.
Example.
4.2.4 condensing water heater models
4.2.4.1 constitute
In addition to the code should be consistent with 4.2.2 and 4.2.3 heating hot water heaters, models constitute rules of dual-use water heaters.
4.2.4.2 Code
--- represents JSL condensing heating household water gas instantaneous water heater for heating water;
Heating the JNL --- represents a household condensation heating gas water heater;
JLL --- denotes a condensation type hot water supply and home dual-type gas instantaneous water heater's heating.
Example 1.
Example 2.
4.2.5 font format
Type the characters that appear in all uppercase characters.
5 Materials and structural requirements
5.1 Material
5.1.1 General Materials
5.1.1.1 during the normal life of the heater, the material should be able to withstand the contemplated mechanical, chemical and thermal effects.
5.1.1.2 material in contact with the gas and combustion products, should be corrosion resistant or corrosion-resistant after treatment.
5.1.1.3 combustion chamber housing should be made of metal material.
5.1.1.4 material involving water heater safety changes, its characteristics manufacturer shall be guaranteed.
5.1.1.5 in contact with an acidic material should be resistant to corrosion or condensate with a protective corrosion resistant coating.
5.1.1.6 prohibit the use of asbestos-containing materials.
5.1.2 material in contact with the water
5.1.2.1 metallic material in contact with water, during the service life, the material should guarantee against corrosive effects, shall withstand the mechanical, chemical and thermal Movies
Ring, and should not pollute the water.
5.1.2.2 plastic materials in contact with water during the service life, the material should meet the mechanical, physical and chemical performance requirements, UV resistance, aging, corrosion
The impact should not pollute the water.
5.1.2.3 Other nonmetallic and auxiliary materials, rubber, sealants, adhesives and lubricants used in the moving parts in contact with water or the like, not dirty
Dyed water quality.
5.1.3 material gas line
5.1.3.1 piping system components should be corrosion resistant, m.p. than 350 ℃ metallic material or a non-combustible material (sealing, the lubricating material
except).
5.1.3.2 made in copper or soft copper tube and to the surface treatment of carbon steel for a gas delivery tube, the inner tube surface for corrosion protection coating
Layer treated to prevent corrosion of sulfide gas.
5.1.3.3 The materials used, such as oil seal, gasket, etc. In addition to meeting the performance requirements of a seal, the gas should be corrosion-resistant.
5.1.4 Materials burner
5.1.4.1 burner should be corrosion-resistant, metallic material melting point greater than 700 deg.] C or non-combustible materials, may not affect the use of the defect.
5.1.4.2 burner flame port portions of the above stainless steel or equivalent corrosion and temperature resistant materials should be used.
5.1.4.3 nozzle, nozzle carriage, adjustable air board should be made of metal or non-combustible materials deg.] C melting point greater than 500, and has a corrosion resistance.
twenty one
5.1.4.4 ignition burner air supply pipe of a metal material is not less than the inner diameter 2mm, melting point greater than 500 deg.] C should be used.
5.1.5 heat exchanger material
The heat exchanger is connected to the hot water heater and the combustion chamber, should be corrosion resistant, is greater than the melting point of the metal material 700 deg.] C.
5.1.6 material by means of the flue gas
5.1.6.1 NATURAL exhaust gas water heater exhaust pipe should be made of metal or corrosion resistant surface is corrosion-resistant material over the metal,
Which should meet the corrosion UV and long-term outdoor use of anti-rust capability, the thickness of the metallic material should satisfy the necessary wind energy
Force (lateral load is applied to 1.5kN/m2 in the exhaust pipe side). Shall not be used as a natural aluminum corrugated tube water heater exhaust gas exhaust pipe.
5.1.6.2 forced exhaust, natural to exhaust, forced exhaust pipe to the exhaust gas water heater is equipped with an exhaust pipe or to the thickness should be not less
To 0.3 mm (nominal dimensions) and in the stainless steel of austenitic steel in 3280 GB/T , or the thickness not less than 0.8mm (nominal ruler
Inch) carbon steel plate treated sided enamel, or equivalent level with more corrosion-resistant, flame temperature, and other material properties. The sealing member, the pad should be
A flexible corrosion-resistant materials.
5.1.7 Case Material
Corrosion-resistant materials should be used or a corrosion-resistant surface over which the sealing member, a flexible pad with corrosion-resistant materials. Outdoor hot
Water trap housing should also conform to the requirements of UV resistance.
5.2 Structure
General Structure 5.2.1
5.2.1.1 heater member should take into account the design and manufacture of safe, strong and durable, reliable overall structure, not during normal operation
Due to damage or affect the use of functional failure.
5.2.1.2 portion of each connecting member (e.g., bolts, etc.) should be strong, reliable, food can be easily fixed to the wall or the floor, can not use
Loose.
5.2.1.3 The water should penetrate into the gas passage.
5.2.1.4 can produce a self-tapping screw type can not be applied to the chips based on the gas communicating passage portion.
5.2.1.5 food designed to be easy to clean and service, parts of the surface should be smooth hand may contact mus...
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