Introduction
Chapter 5 and Clause 7.2 are mandatory clauses, while the rest are recommended clauses.
This standard replaces GB 12955-1991 “General Technical Conditions for Steel Fire Doors” and GB 14101-1993 “General Technical Conditions for Wooden Fire Doors.”
Compared with GB 12955-1991 and GB 14101-1993, the main changes in this standard are as follows:
- Added content on the classification of fire doors by material (see 4.1);
- Modified the classification of fire doors based on fire resistance performance, changing from the original classification of Class A, B, and C to “Insulated Fire Doors (Class A),” “Partially Insulated Fire Doors (Class B),” and “Non-Insulated Fire Doors (Class C)” in this edition (GB 12955-1991’s 4.3, GB 14101-1993’s 4.1; this edition’s 4.4);
- The requirements for materials used in fire doors are more comprehensive and specific, adding requirements for the combustibility performance and smoke toxicity of materials other than metal materials (GB 12955-1991 and GB 14101-1993’s 5.1; this edition’s 5.2);
- Removed the requirements for wind pressure deformation resistance, air permeability resistance, and water permeability resistance for wooden fire doors used as exterior doors;
- More specific performance requirements for fire locks (GB 12955-1991’s 5.1.3, GB 14101-1993’s 5.1.4; this edition’s 5.3.1);
- More specific performance requirements for fire hinges (GB 12955-1991’s 5.1.3 and 5.1.4, GB 14101-1993’s 5.1.4, this edition’s 5.3.2);
- More specific performance requirements for door closers (GB 12955-1991’s 5.1.3, GB 14101-1993’s 5.1.4, this edition’s 5.3.3);
- More specific requirements for fire-resistant glass (GB 12955-1991’s 5.1.3, GB 14101-1993’s 5.1.3, this edition’s 5.3.7);
- Added requirements and test methods for the quality of door leaves (see 5.5, 6.6);
- Added requirements and test methods for the deflection in the width direction of door leaves (see 5.7, 6.8.3);
- Added requirements and test methods for the gap between door leaves and door frames (see 5.8.2.6, 6.9.3);
- Added requirements and test methods for the flexibility of fire doors (see 5.9, 6.10);
- Added requirements and test methods for the reliability of fire doors (see 5.10, 6.11);
- Improved the test method for the torsional rigidity of door leaves (GB 14101-1993’s 6.2; this edition’s 6.8.2);
- Added a measurement method for the overlap dimensions between door leaves and door frames (see 6.9.1);
- Added a determination criterion (see 7.2.4);
- Added normative Appendix A (see Appendix A);
- Added normative Appendix B (see Appendix B);
- Added normative Appendix C (see Appendix C);
- Added normative Appendix D (see Appendix D);
Appendices A, B, C, and D of this standard are normative appendices.
This standard was proposed by the Ministry of Public Security of the People’s Republic of China.
This standard is under the jurisdiction of the National Technical Committee on Fire Protection of Standardization Administration of China (SAC/TC113/SC8).
The drafting organizations of this standard include the Ministry of Public Security Tianjin Fire Research Institute, Shenzhen LanDun Industrial Co., Ltd., Shenyang Qiangdun Fire Doors Co., Ltd., Shenzhen Pengji Long Electric Security Co., Ltd., Chongqing Meixin·Mason Door Industry Co., Ltd., Guangdong King Kong Glass Technology Co., Ltd., Tianjin Mingmen Fireproof Building Materials Industrial Co., Ltd., Beijing Guanghua Anfu Industry Door and Window Co., Ltd., and Zhejiang Tangmen Metal Structure Co., Ltd.
The main drafters of this standard are Zhao Huali, Liu Xiaohui, Huang Wei, Li Bo, Li Xiquan, Wang Pengxiang, Zhang Xianghui, Ji Xiang’an, Lü Zili, Yu Yang, Xia Mingxian, Zhang Minggang, Ji Chunchuan, and Tang Junlie.
This standard replaces the following versions of the standards it supersedes: - GB 12955-1991;
- GB 14101-1993.
Please note that some contents of this standard may involve patents. The issuing organization of this standard shall not be responsible for identifying these patents.
Fire Doors
1 Scope
This standard specifies the classification, codes and markings, requirements, test methods, inspection rules, markings, packaging, transportation, and storage of fire doors.
This standard applies to hinged wooden, steel, steel-wood fire doors, and other material fire doors. Fire doors with other opening methods can refer to this standard for implementation.
2 Normative References
The following documents are essential for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 708 Dimensions, Shape, Weight, and Permissible Deviations for Cold-Rolled Steel Plates and Strips
GB/T 709 Dimensions, Shape, Weight, and Permissible Deviations for Hot-Rolled Steel Plates and Strips
GB/T 2828.1 Sampling Procedures for Inspection by Attributes Part 1: Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-Lot Inspection
GB/T 4823-1995 Defects of Sawn Timber (eqv ISO 1029:1974)
GB/T 5823-1986 Terminology of Building Windows and Doors
GB/T 5824 Series of Dimensions for Building Windows and Door Openings
GB/T 5907-1986 Basic Terms of Fire Protection Part One
GB/T 6388 Markings for Handling of Goods
GB/T 7633 Methods for Fire Resistance Tests of Doors and Shutters
GB 8624-2006 Classification for Combustion Performance of Building Materials and Products
GB/T 8625-2005 Test Methods for Incombustibility of Building Materials
GB 9969.1 General Principles for Preparation of Instructions for Use of Industrial Products
GB/T 13306 Plates
GB/T 14436 General Principles for Industrial Product Guarantee Documents
GB 15763.1 Safety Glazing Materials in Building – Fire-Resistant Glazing
GB 16807 Fire-Resistant Expansion Seal Material
GB/T 20285-2006 Hazardous Classification for Smoke Toxicity of Materials
GA 93 Door Closers for Fire Doors
JG/T 122-2000 Wooden Doors and Windows for Buildings
QB/T 2474 Pin Tumbler Cylinder Locks
3 Terms and Definitions
The terms and definitions established in GB/T 5823-1986 and GB/T 5907-1986, as well as the following terms and definitions, apply to this standard.
3.1
Hinged Fire Doors fire resistant side hung doorsets
Consisting of door frames, door leaves, and fire-resistant hardware accessories such as fire hinges and fire locks, with hinges as the axis perpendicular to the ground, which can rotate in a clockwise or counterclockwise direction to open or close the door leaves.
3.2
Wooden Fire Doors fire resistant timber doorsets
Doors made of flame-retardant wood or flame-retardant wood products for door frames, door leaf skeletons, door leaf panels, and if filled with materials, filled with fire-resistant and heat-insulating materials that are non-toxic and harmless to the human body, equipped with fire-resistant hardware accessories, having a certain level of fire resistance performance.
3.3
Steel Fire Doors fire resistant steel doorsets
Doors made of steel materials for door frames, door leaf skeletons, and door leaf panels, and if filled with materials, filled with fire-resistant and heat-insulating materials that are non-toxic and harmless to the human body, equipped with fire-resistant hardware accessories, having a certain level of fire resistance performance.
3.4
Steel-Wood Fire Doors fire resistant timber doorsets with steel structure
Doors made of steel and flame-retardant wood materials or flame-retardant wood products for door frames, door leaf skeletons, door leaf panels, and if filled with materials, filled with fire-resistant and heat-insulating materials that are non-toxic and harmless to the human body, equipped with fire-resistant hardware accessories, having a certain level of fire resistance performance.
3.5
Other Material Fire Doors other material fire resistant doorsets
Doors made of inorganic non-combustible materials other than steel, flame-retardant wood, or flame-retardant wood products for door frames, door leaf skeletons, door leaf panels, and if filled with materials, filled with fire-resistant and heat-insulating materials that are non-toxic and harmless to the human body, equipped with fire-resistant hardware accessories, having a certain level of fire resistance performance.
3.6
Insulated Fire Doors (Class A) fully insulated doorsets
Fire doors that meet both fire integrity and insulation requirements within a specified time.
3.7
Partially Insulated Fire Doors (Class B) partially insulated doorsets
3.8 Non-Insulated Fire Doors (Class C)
Fire doors that can meet the requirements of fire integrity within a specified time.
4 Classification, Codes, and Markings
4.1 Classification and Codes by Material
4.1.1 Wooden fire doors, code: MFM;
4.1.2 Steel fire doors, code: GFM;
4.1.3 Steel-wood fire doors, code: GMFM;
4.1.4 Other material fire doors, code: FM. ( represents the specific description of other materials in uppercase pinyin letters)
4.2 Classification and Codes by the Number of Door Leaves
4.2.1 Single-leaf fire doors, code: 1.
4.2.2 Double-leaf fire doors, code: 2.
4.2.3 Multi-leaf fire doors (fire doors with more than two door leaves), the code is represented by the number of door leaves in digits.
4.3 Classification and Codes by Structural Type
4.3.1 Fire doors with fire-resistant glass on the door leaf, code: b.
4.3.2 Fire door frames: Double-groove frames are coded as s, single-groove frames as d.
4.3.3 Fire doors with vision panels, code: l.
4.3.4 Fire doors with glass and vision panels, code: bl.
4.3.5 Fire doors without glass, code omitted.
4.4 Classification and Codes by Fire Resistance Performance
The classification and codes of fire doors by fire resistance performance are shown in Table 1.
4.5 Other Codes and Markings
4.5.1 Other Codes
4.5.1.1 Bottom frame code
Fire doors with a bottom frame are coded as k.
4.5.1.2 Code for the closing direction of hinged door leaves
The code for the closing direction of hinged door leaves is shown in Table 2.
Note: For double-leaf fire doors, the closing direction code is represented by the closing direction of the door leaf where the lock is installed.
Table 1 Classification by Fire Resistance Performance
Name
Fire Resistance Performance
Code
Insulated Fire Doors
(Class A)
Fire insulation ≥0.50 h
Fire integrity ≥0.50 h
A0.50 (Class C)
Fire insulation ≥1.00 h
Fire integrity ≥1.00 h
A1.00 (Class B)
Fire insulation ≥1.50 h
Fire integrity ≥1.50 h
A1.50 (Class A)
Fire insulation ≥2.00 h
Fire integrity ≥2.00 h
A2.00
Fire insulation ≥3.00 h
Fire integrity ≥3.00 h
A3.00
Partially Insulated Fire Doors
(Class B)
Fire insulation ≥0.50 h
Fire integrity ≥1.00 h
B1.00
Fire integrity ≥1.50 h
B1.50
Fire integrity ≥2.00 h
B2.00
Fire integrity ≥3.00 h
B3.00
Non-Insulated Fire Doors
(Class C)
Fire integrity ≥1.00 h
C1.00
Fire integrity ≥1.50 h
C1.50
Fire integrity ≥2.00 h
C2.00
Fire integrity ≥3.00 h
C3.00
Table 2 Code for Closing Direction of Hinged Door Leaves
Code
Description
Illustration
5
Door leaf closes clockwise
6
Door leaf closes counterclockwise
4.5.2 Markings
The marking of fire doors is as follows:
Example 1: GFM-0924-bslk5 A1.50 (Class A)-1. Represents an insulated (Class A) steel fire door with an opening width of 900 mm and an opening height of 2400 mm, the door leaf embedded with glass, double-groove frame, with vision panel, with bottom frame, door leaf closes clockwise, fire integrity and fire insulation time not less than 1.50 h of Class A single-leaf fire door.
Example 2: MFM-1221-d6B1.00-2. Represents a partially insulated (Class B) wooden fire door with an opening width of 1200 mm and an opening height of 2100 mm, the door leaf without glass, single-groove frame, without vision panel, without bottom frame, door leaf closes counterclockwise, fire integrity time not less than 1.00 h, fire insulation time not less than 0.50 h of double-leaf fire door.
4.5.3 Specifications
The specifications of fire doors are represented by the dimensions of the opening, which should comply with the related provisions of GB/T 5824. Special opening dimensions can be determined through consultation between the manufacturer and the user as needed.
6.8.4 Difference in Diagonal Lengths of Door Frame Inner Cutouts |L1′-L2′|
Measured with a steel tape measure.
Figure 13 Schematic Diagram of Measuring Positions for Diagonal Lengths of Door Frame Inner Cutouts
6.9 Fit Tolerance
6.9.1 Overlap Dimension Between Door Leaf and Frame (see Figure 14)
6.9.1.1 In the state of use, install the test piece on the test frame with the door leaf in a closed position, mark the middle of the left, right, and top intersections of the door leaf and frame with a scribe, then measure the overlap width with a steel ruler.
6.9.1.2 The overlap width between the door leaf and frame is taken as the minimum measured value.
6.9.2 Clearance Between Door Leaf and Frame
In the state of use, install the test piece on the test frame with the door leaf in a closed position. Measure the clearance on the hinge side, lock side, top frame, bottom frame, and between double or multiple door leaves with a feeler gauge, taking the maximum thickness that can be inserted as the measurement value.
6.9.3 Gap Between Door Leaf and Frame (see Figure 14)
In the state of use, install the test piece on the test frame with the door leaf in a closed position. Measure the gap between the door leaf and frame with a feeler gauge, taking the maximum thickness that can be inserted as the measurement value.
Figure 14 Schematic Diagram of Overlap Dimension and Gap Between Door Leaf and Frame
6.9.4 Difference in Plane Elevation Between Frame and Door Leaf on the Opening Side R
6.9.4.1 With the door leaf closed, measure the difference in plane elevation between the frame and door leaf using a vernier caliper. The measurement positions are indicated in Figure 15 at positions R1, R2, R3…R6.
6.9.4.2 The difference in plane elevation R between the frame and door leaf is taken as the extreme value of the measured values.
Figure 15 Schematic Diagram of Measurement Positions for Difference in Plane Elevation Between Frame and Door Leaf
6.10 Flexibility
6.10.1 Opening and Closing Flexibility
With the fire door in use, install the test piece on the test frame and assess the opening and closing flexibility by hand feel and visual inspection.
6.10.2 Door Leaf Opening Force F
In the state of use, install the test piece on the test frame with the door leaf in a closed position. Apply a force gauge to the door handle perpendicular to the door leaf and pull the door open, measuring and recording the door leaf opening force F.
6.11 Reliability
6.11.1 Test Frame
A adjustable frame to suit the installation of fire doors of different sizes and specifications. The frame should have sufficient rigidity to avoid deformation that could affect test results during the test.
6.11.2 Test Piece
Includes the door frame, door leaf, and fire hardware accessories such as fire locks, door closers, and sequence selectors that should be equipped in actual use.
6.11.3 Test Procedure
6.11.3.1 Fix the test piece on the test frame.
6.11.3.2 Opening and closing the door leaf counts as one operation, with a cycle time of 8 s to 14 s and an opening angle of 70°. Record the number of operations. During the test, note whether any components of the fire door become loose, fall off, deform severely, or jam when opening and closing.
6.12 Fire Resistance Performance
6.12.1 Test Procedure
In the state of use, install the test piece on the test frame and check the test piece before the fire resistance test; the door leaf should open flexibly. Close the door leaf using a door closer or other closing device so that the fire lock latch engages, without locking the door leaf with a key; for special-use doors (e.g., utility shaft doors), the door leaf may be locked with a key, which should not remain in the lock.
Conduct the fire resistance test in accordance with GB/T 7633.
Note: The test piece should be inspected for fit tolerance, flexibility, and fire resistance performance in the same frame and state.
6.12.2 Criteria for Fire Resistance Performance
6.12.2.1 Fire Integrity
To be determined in accordance with GB/T 7633.
6.12.2.2 Fire Insulation
To be determined in accordance with GB/T 7633.
7 Inspection Rules
7.1 Factory Inspection
7.1.1 Routine factory inspection items include 5.1, 5.2.2.3, 5.2.3.3, 5.2.4.2, 5.4.2, 5.5, 5.6, and 5.7, which should be individually inspected for each fire door’s frame and leaf; routine inspection items for fire doors upon installation and handover include 5.8, 5.9, and the installation conditions of accessories in 5.3, which should be inspected for each fire door; 5.10 is a sampling inspection item, and the product sampling method should be established by the manufacturer based on production volume, in accordance with the relevant requirements of GB/T 2828.1.
7.1.2 Fire door products must be individually inspected and passed by the manufacturer’s quality inspection department according to the factory inspection items, and a certificate of conformity must be issued before the product can leave the factory and be accepted and handed over for use.
7.2 Type Inspection
7.2.1 Inspection items are listed in Table 6, and inspections should be conducted in sequence according to the standard’s requirements.
7.2.2 The minimum inspection batch for fire doors is 9 units, drawn from the manufacturer’s finished goods warehouse.
7.2.3 Type inspection should be conducted under any of the following conditions:
a) Trial identification for new products or products transferred to production in a new factory;
b) When there are changes in structure, materials, production processes, key procedures, and processing methods that affect its performance;
c) Normal production, at least once every three years;
d) When production resumes after a stoppage of more than one year;
e) When factory inspection results differ significantly from the previous type inspection;
f) In the event of a major quality incident;
g) When required by quality supervision authorities.
7.2.4 Decision Criteria
If the inspection results listed in Table 6 do not include any Class A defects, and the sum of Class B and Class C defects does not exceed four items, with no more than one Class B defect, the product is deemed qualified. Otherwise, the product is deemed not qualified.
Table 6 Inspection Items
Serial Number
Inspection Item
Requirement Clause
Test Method Clause
Defect Classification
1
Filling Material
5.2.1
6.3.1
A
2
Wood
5.2.2
6.3.2
A
3
Engineered Wood
5.2.3
6.3.3
A
4
Steel
5.2.4
6.3.4
A
5
Other Material
5.2.5
6.3.5
A
6
Adhesive
5.2.6
6.3.6
A
7
Fire Lock
5.3.1
6.4.1
B
8
Fire Hinge
5.3.2
6.4.2
B
9
Fire Door Closer
5.3.3
6.4.3
B
10
Fire Sequencer
5.3.4
6.4.4
B
11
Fire Bolt
5.3.5
6.4.5
C
12
Cover Strip
5.3.6
6.4.6
B
13
Fire Seal
5.3.7
6.4.7
A
14
Fire Glass
5.3.8
6.4.8
A
15
Manufacturing Process and Appearance Quality
5.4
6.5
C
16
Door Leaf Weight
5.5
6.6
A
17
Door Leaf Height Deviation
5.6
6.7.1
C
18
Door Leaf Width Deviation
5.6
6.7.2
C
19
Door Leaf Thickness Deviation
5.6
6.7.3
B
20
Inner Cutout Height Deviation of Frame
5.6
6.7.4
C
21
Inner Cutout Width Deviation of Frame
5.6
6.7.5
C
22
Side Wall Width Deviation of Frame
5.6
6.7.6
C
23
Difference in Diagonal Lengths of Door Leaf
5.7
6.8.1
C
24
Door Leaf Warping
5.7
6.8.2
B
25
Door Leaf Width Direction Warping
5.7
6.8.3
B
26
Door Leaf Height Direction Warping
5.7
6.8.3
B
Table 6 (continued)
Serial Number
Inspection Item
Requirement Clause
Test Method Clause
Defect Classification
27
Difference in Diagonal Lengths of Frame Inner Cutout
5.7
6.8.4
C
28
Overlap Dimension Between Door Leaf and Frame
5.8.1
6.9.1
B
29
Clearance on Hinge Side Between Door Leaf and Frame
5.8.2.1
6.9.2
C
30
Clearance on Lock Side Between Door Leaf and Frame
5.8.2.2
6.9.2
C
31
Clearance Between Door Leaf and Top Frame
5.8.2.3
6.9.2
C
32
Gap Between Middle of Double Doors
5.8.2.4
6.9.2
C
33
Gap Between Frame and Bottom Frame or Floor
5.8.2.5
6.9.2
C
34
Gap Between Door Leaf and Frame
5.8.2.6
6.9.3
C
35
Difference in Plane Elevation Between Frame and Door Leaf on the Opening Side
5.8.3
6.9.4
C
36
Opening and Closing Flexibility
5.9.1
6.10.1
A
37
Opening Force
5.9.2
6.10.2
B
38
Reliability
5.10
6.11
A
39
Fire Resistance Performance
5.11
6.12
A
8 Marking, Packaging, Transportation, and Storage
8.1 Marking
8.1.1 Each fire door should have a permanent label in a conspicuous location, including the following information:
a) Product name, model specifications, and trademark (if any);
b) Manufacturer’s name or mark and address;
c) Date of manufacture and product batch number;
d) Applicable standards;
8.1.2 The production of product labels should comply with GB/T 13306.
8.2 Packaging, Transportation, and User Manual
The packaging of the product and its hardware accessories should be safe, reliable, and convenient for loading, unloading, transportation, and storage. Packaging and transportation should comply with GB/T 6388.
The following documents should be provided with the product:
a) Certificate of conformity, as per GB/T 14436;
b) Product manual, as per GB 9968.1;
c) Packing list;
d) Installation diagram of the product;
e) List of fire hardware accessories and attachments.
These documents should be placed in a waterproof bag.
During transportation, avoid damage to the packaging due to collisions. Handle with care during loading and unloading to prevent mechanical deformation or damage to the product that could affect installation and use.
8.3 Storage
The product should be stored in a ventilated, dry place, avoiding contact with corrosive substances and gases, and protective measures against moisture, rain, sunlight, and corrosion should be taken. When stored flat, the bottom must be padded evenly, the stack height of door frames should not exceed 1.5 m, and the stack height of door leaves should not exceed 1.2 m. When stored upright, the tilt angle should not exceed 20°.
Appendix A
(Normative Appendix) Requirements and Test Methods for Fire Locks
A.1 Requirements
A.1.1 The firmness, flexibility, and appearance quality of fire locks should comply with QB/T 2474.
A.1.2 Fire resistance performance of fire locks.
A.1.2.1 The fire resistance time of fire locks should not be less than the fire resistance time of the fire doors on which they are installed.
A.1.2.2 During the fire resistance test, fire locks should not show significant deformation or melting.
A.1.2.3 During the fire resistance test, there should be no flame penetration at the fire lock.
A.1.2.4 During the fire resistance test, fire locks should ensure that the fire door leaf remains closed.
A.2 Test Methods
A.2.1 The firmness, flexibility, and appearance quality of fire locks should be tested in accordance with QB/T 2474.
A.2.2 Fire resistance performance test for fire locks
A.2.2.1 Install the fire lock on the fire door as per actual usage conditions.
A.2.2.2 Conduct the fire resistance test under the temperature rise and furnace pressure conditions specified in GB/T 7633.
A.2.2.3 During the fire resistance test, observe and record phenomena according to the requirements of A.1.2.
Appendix B
(Normative Appendix) Fire Hinge (Hinge) Fire Resistance Performance Requirements and Test Methods
B.1 Requirements
B.1.1 Fire resistance performance of fire hinges.
B.1.1.1 The fire resistance duration of the fire hinges should not be less than the fire resistance duration of the fire doors on which they are installed.
B.1.1.2 During the fire resistance test, fire hinges should not exhibit any noticeable deformation.
B.1.1.3 During the fire resistance test, there should be no flame penetration at the location of the fire hinges.
B.1.1.4 During the fire resistance test, fire hinges should ensure that there is no displacement at the installation point between the fire door leaf and the hinges, and the door remains in a properly closed state.
B.2 Test Methods
B.2.1 Fire resistance performance test for fire hinges
B.2.1.1 Install the fire hinges on the fire door as per actual usage conditions.
B.2.1.2 Conduct the fire resistance test under the temperature rise and furnace pressure conditions specified in GB/T 7633.
B.2.1.3 During the fire resistance test, observe and record phenomena according to the requirements of B.1.1.
Appendix C
(Normative Appendix) Fire Sequencer Fire Resistance Performance Requirements and Test Methods
C.1 Requirements
C.1.1 Fire resistance performance of fire sequencers.
C.1.1.1 The fire resistance duration of the fire sequencers should not be less than the fire resistance duration of the fire doors on which they are installed.
C.1.1.2 During the fire resistance test, fire sequencers should not exhibit any noticeable deformation or melting.
C.2 Test Methods
C.2.1 Fire resistance performance test for fire sequencers
C.2.1.1 Install the fire sequencer on the fire door as per actual usage conditions.
C.2.1.2 Conduct the fire resistance test under the temperature rise and furnace pressure conditions specified in GB/T 7633.
C.2.1.3 During the fire resistance test, observe and record phenomena according to the requirements of C.1.1.
Appendix D
(Normative Appendix) Fire Bolt Fire Resistance Performance Requirements and Test Methods
D.1 Requirements
D.1.1 Fire resistance performance of fire bolts.
D.1.1.1 The fire resistance duration of the fire bolts should not be less than the fire resistance duration of the fire doors on which they are installed.
D.1.1.2 During the fire resistance test, fire bolts should not exhibit any noticeable deformation or melting.
D.1.1.3 During the fire resistance test, there should be no flame penetration at the location of the fire bolts.
D.1.1.4 During the fire resistance test, fire bolts should ensure that there is no displacement at the installation point between the fire door leaf and the bolts, and the door remains in a properly closed state.
D.2 Test Methods
D.2.1 Fire resistance performance test for fire bolts
D.2.1.1 Install the fire bolts on the fire door as per actual usage conditions.
D.2.1.2 Conduct the fire resistance test under the temperature and furnace pressure conditions specified in GB/T 7633.
D.2.1.3 During the fire resistance test, observe and record phenomena according to the requirements of D.1.1.
