Fire-Resistant Duct Inspection Services
International Standards · Accredited Certification · Safety Assurance
Liansuo Construction Technology Co., Ltd. provides professional on-site inspection services for fire-resistant duct systems to ensure building ventilation systems maintain fire-resistance integrity under fire conditions, preventing the spread of flames and smoke to safeguard life safety and protect property. Services are conducted in accordance with ISO/IEC 17020 and recognized under IAS AC98 accreditation, with all inspectors authorized under international standards.
Reference Standards
- ASTM E3385 – Standard Practice for On-site Inspection of Fire Resistive Duct Systems
- UL 2221 – Standard for Tests of Fire Resistive Grease Duct Enclosure Assemblies
- ASTM E2336 – Test Methods for Fire Resistive Grease Duct Enclosure Systems
- ASTM E2816 – Test Methods for Fire Resistive Metallic HVAC Duct Systems
- ISO 6944-1 – Fire Containment – Elements of Building Construction – Part 1: Ventilation Ducts
Scope of Inspection
- Grease Duct Systems: Ensuring commercial kitchen exhaust ducts comply with fire-protection requirements
- HVAC Air Duct Systems: Verifying ductwork integrity and installation quality across fire compartments
- Hazardous Exhaust Systems: Specialized inspections for chemical, laboratory, and energy sector ventilation systems
Inspection Procedure
- Preparation Stage
- Review technical documents and listed product data
- Verify materials and components (steel thickness, fireproof coatings, reinforcement, etc.)
- Develop on-site inspection plan
- Inspection Process & Key Focus Areas
- Duct Construction: Materials, thickness, seams, and airflow requirements
- Joints and Connections: Flange types, spacing, and assembly methods
- Reinforcement: Dimensions and spacing of reinforcement rods
- Fire Protection System: Fire rating, material thickness, and density compliance
- Supports and Hangers: Type, spacing, and load-bearing capacity
- Access Doors: Construction and fire-protection measures (if applicable)
- Reporting & Re-Inspection
- Documentation: Record all non-conformities in inspection checklist
- Reporting: Issue inspection reports to contractors and clients
- Corrective Action & Re-Inspection: Follow-up inspections to confirm compliance with design listings and standards
Deliverables
- Work Instruction
- Fire-Resistant Duct Inspection Checklist
- Inspection Report
Key Advantages
- International Recognition: Fully compliant with ISO/IEC 17020 and IAS AC98 accreditation requirements
- Authoritative Oversight: Inspectors authorized under international standards.
- Traceable Process: Comprehensive documentation through checklists, images, and reports
- Risk Mitigation: Helping owners, contractors, and insurers identify and rectify potential hazards
