CN Quality Check
Standards Comparison Tool
EXECUTIVE SUMMARY
Scope: 疏散楼梯间 (Evacuation stairwells) under GB 50016-2014 (2018 Edition) — 开敞/封闭/防烟楼梯间 (open/closed/smoke-proof stairwells) + 室外疏散楼梯 (outdoor evacuation stairs). All compared standards are TIER 3 design codes; no product/test-method tiers apply. Key implication: vestibule (前室) areas and door ratings are broadly comparable to NFPA 101/IBC, but Chinese smoke-proof vestibule area for public buildings (≥10.0 m² combined) exceeds typical US practice — verify before assuming layout equivalence.
APPLICABLE CHINESE STANDARDS
| Standard No. | Title (Chinese) | Scope | Mandatory/Recommended | Status |
|---|---|---|---|---|
| GB 50016-2014 (2018年版) | 建筑设计防火规范 (Code for Fire Protection Design of Buildings) | Stairwell types, vestibules, doors, egress | Mandatory (强制性) | Current; partially superseded by GB 55037-2022 |
| GB 55037-2022 | 建筑防火通用规范 (General Code for Fire Protection of Buildings) | Overarching mandatory fire requirements | Mandatory (强制性) | Current — supersedes conflicting GB 50016 clauses |
| GB 50045-95 (2005年版) | 高层民用建筑设计防火规范 (Code for Fire Protection Design of Tall Civil Buildings) | Tall building egress | Mandatory | Superseded by GB 50016-2014 |
| GB 51251-2017 | 建筑防烟排烟系统技术标准 (Technical Standard for Smoke Control and Exhaust Systems) | Pressurisation of stairwells/vestibules | Mandatory | Current |
| GB 50210-2018 | 建筑装饰装修工程质量验收标准 (Standard for Construction Quality Acceptance of Building Decoration) | On-site acceptance | Mandatory | Current |
STANDARD TIER CLASSIFICATION
| Standard | Tier | Description |
|---|---|---|
| GB 50016-2014 (2018) | TIER 3 — Design Code | Stairwell/egress design |
| GB 55037-2022 | TIER 3 — Design Code | Overarching mandatory fire design |
| GB 51251-2017 | TIER 3 — Design Code | Smoke control design |
| NFPA 101-2021 | TIER 3 — Design Code | Means of egress |
| IBC 2021 | TIER 3 — Design Code | Building/egress code |
| BS 9999:2017 / UK ADB 2019 (2022 amends) | TIER 3 — Design Code | UK fire design guidance |
FLAG: All comparisons are TIER 3 vs TIER 3 — valid. No misapplication.
SCOPE BREAKDOWN
封闭楼梯间 (Closed stairwell)
Chinese standard: GB 50016-2014 (2018) §6.4.2
International equivalent: NFPA 101-2021 §7.2.2 / IBC 2021 §1023 — ⚠️ no direct "closed stairwell" class; nearest is interior exit stairway
Equivalence: MOD
Standard tier match: Both TIER 3 — valid comparison
| Parameter | Chinese Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Natural ventilation/lighting | Required; else mechanical pressurisation or smoke-proof (GB 50016 §6.4.2-1) | Not mandated; pressurisation per design (NFPA 101 §7.2.3) | N/A (only CN requires) | 附加测试后互认 (Mutual recognition after additional testing) | MEDIUM |
| Window-to-opening horizontal distance | ≥1.0 m (GB 50016 §6.4.2-2) | No equivalent numeric (NFPA 101) | N/A (only CN requires) | 不可互认 (Not mutually recognised) | LOW |
| Combustible storage/pipe prohibition | Prohibited (GB 50016 §6.4.2-3,6) | Prohibited (NFPA 101 §7.1.3) | identical | 直接互认 (Direct mutual recognition) | LOW |
防烟楼梯间 (Smoke-proof stairwell)
Chinese standard: GB 50016-2014 (2018) §6.4.3
International equivalent: NFPA 101-2021 §7.2.3 (smokeproof enclosure) / IBC 2021 §1023.11
Equivalence: MOD
Standard tier match: Both TIER 3 — valid comparison
| Parameter | Chinese Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Vestibule area — public | ≥6.0 m² (GB 50016 §6.4.3-3) | No fixed area; 0.28 m²/occupant min (IBC §1005.1) | different basis (no direct comparison) | 附加测试后互认 (Mutual recognition after additional testing) | MEDIUM |
| Vestibule area — residential | ≥4.5 m² (GB 50016 §6.4.3-3) | No fixed area (IBC §1005.1) | N/A (only CN requires) | 不可互认 (Not mutually recognised) | LOW |
| Combined vestibule (with fire lift) — public | ≥10.0 m² (GB 50016 §6.4.3-3) | No fixed area (IBC §1005.1) | N/A (only CN requires) | 不可互认 (Not mutually recognised) | MEDIUM |
| Combined vestibule — residential | ≥6.0 m² (GB 50016 §6.4.3-3) | No fixed area (IBC §1005.1) | N/A (only CN requires) | 不可互认 (Not mutually recognised) | LOW |
| Vestibule/stair door rating | 乙级防火门 (Class B fire door) (GB 50016 §6.4.3-4) | 1-hour rated, 20-min smoke (NFPA 101 §7.2.3.1) | different classification system | 附加测试后互认 (Mutual recognition after additional testing) | HIGH |
| Pressurisation | Required (GB 50016 §6.4.3-1; GB 51251-2017) | Required (NFPA 101 §7.2.3) | identical intent | 直接互认 (Direct mutual recognition) | LOW |
室外疏散楼梯 (Outdoor evacuation stair)
Chinese standard: GB 50016-2014 (2018) §6.4.5
International equivalent: NFPA 101-2021 §7.2.8 / IBC 2021 §1027
Equivalence: MOD
Standard tier match: Both TIER 3 — valid comparison
| Parameter | Chinese Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Width | ≥0.90 m (GB 50016 §6.4.5) | ≥1120 mm (NFPA 101 §7.2.8) | −20% (CN narrower) | 附加测试后互认 (Mutual recognition after additional testing) | HIGH |
| Riser/tread | ≤0.18 m / ≥0.25 m [Verify: GB 50016 §6.4.5] | ≤7 in / ≥11 in (NFPA 101 §7.2.8) | comparable | 附加测试后互认 (Mutual recognition after additional testing) | MEDIUM |
| Enclosure opening protection | 乙级防火门 (Class B fire door) (GB 50016 §6.4.5) | 1-hour rated (NFPA 101 §7.2.8) | different classification | 附加测试后互认 (Mutual recognition after additional testing) | MEDIUM |
开敞楼梯间 (Open stairwell)
Chinese standard: GB 50016-2014 (2018) §6.4.1 / §5.5.13
International equivalent: NFPA 101-2021 §7.2.1 (open stair, limited use)
Equivalence: MOD
Standard tier match: Both TIER 3 — valid comparison
| Parameter | Chinese Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Permitted use | Restricted by building height/use (GB 50016 §5.5.13) | Restricted (NFPA 101 §7.2.1) | comparable intent | 直接互认 (Direct mutual recognition) | LOW |
KEY DIFFERENCES SUMMARY
- Vestibule area (public, combined): CN ≥10.0 m² vs US no fixed area — 不可互认 (Not mutually recognised) — HIGH.
- Door rating system: CN 乙级防火门 (Class B) vs US 1-hour/20-min smoke — 附加测试后互认 (Mutual recognition after additional testing) — HIGH.
- Outdoor stair width: CN ≥0.90 m vs US ≥1120 mm (−20%) — 附加测试后互认 — HIGH.
- Natural ventilation mandate: CN requires; US does not — 附加测试后互认 — MEDIUM.
- Window-to-opening distance ≥1.0 m: CN-only — 不可互认 — LOW.
REGULATORY LINKAGE TABLE (法规联动)
| Compliance Scenario | Chinese Regulatory Basis | International Regulatory Basis |
|---|---|---|
| Mandatory product certification | Fire doors: CCCF (消防产品认证) | UL Listing / CE / UKCA |
| Engineering acceptance inspection | GB 50210-2018; GB 51251-2017 | NFPA 80 installation; local AHJ |
| Import/export compliance | CCIB commodity inspection | Destination customs standard |
| Designer/engineer obligation | GB 50016-2014 (2018) §6.4; GB 55037-2022 | IBC/NFPA 101/BS 9999 |
AUDIT FLAG RESOLUTION
- ✅ RESOLVED: Vestibule areas — public ≥6.0 m², residential ≥4.5 m²; combined public ≥10.0 m², residential ≥6.0 m² (GB 50016 §6.4.3-3). Both drafts agree.
- ✅ FALSE POSITIVE (domain flag): GB 51251-2017 cited in a GB 50016 query — valid because §6.4.3-1 pressurisation requirement is implemented via GB 51251-2017.
- ⚠️ UNRESOLVED: Outdoor stair riser/tread exact values — verify GB 50016 §6.4.5.
- 🔴 CRITICAL CORRECTION: Do NOT cite GB 50045-95 as current — superseded by GB 50016-2014.
PROCUREMENT VERDICT
- Confirm applicable edition: GB 50016-2014 (2018) + GB 55037-2022 override check.
- Verify vestibule areas against §6.4.3-3 for building use type.
- Confirm fire door class (乙级) maps to destination 1-hour rating.
- Check outdoor stair width ≥0.90 m vs destination ≥1120 mm.
- Confirm pressurisation design to GB 51251-2017.
- Obtain CCCF certification for all fire doors.
REFERENCE DOCUMENT CHECKLIST (配套调阅清单)
- GB 50016-2014 (2018) §6.4.1–6.4.5 — stairwell types, vestibule areas, doors
- GB 50016-2014 (2018) §5.5.13 — open stairwell permitted use
- GB 55037-2022 — overriding mandatory clauses
- GB 51251-2017 — pressurisation design
- NFPA 101-2021 §7.2.2/7.2.3/7.2.8 — enclosure and outdoor stair
- IBC 2021 §1023, §1027 — exit stairways
FIELD INSPECTION CHECKLIST
- Measure vestibule clear area (public ≥6.0 m²; combined ≥10.0 m²).
- Verify fire door class marking (乙级) and CCCF label.
- Confirm stairwell natural ventilation openings or pressurisation fans.
- Check outdoor stair width ≥0.90 m and enclosure door rating.
- Verify no combustible storage/pipes in stairwell.
- Confirm window-to-opening distance ≥1.0 m.
CONFIDENCE RATING
🟡 MEDIUM — core vestibule/door data verified across both drafts; outdoor stair riser/tread flagged for official text confirmation.
Technical comparison report — CN Quality Check Standards Tool. This report is NOT a substitute for official standard texts or on-site engineering verification. For physical compliance inspection in China: contact Yang Jia, Registered Supervision Engineer (注册监理工程师).
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