Fire-Resistive Duct Inspection Services

International Standards · Accredited Certification · Safety Assurance
Liansuo Construction Technology Co., Ltd. provides professional on-site inspection services for fire-resistive 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 E3385Standard Practice for On-site Inspection of Fire Resistive Duct Systems UL 2221Standard for Tests of Fire Resistive Grease Duct Enclosure Assemblies ASTM E2336Test Methods for Fire Resistive Grease Duct Enclosure Systems ASTM E2816 Test Methods for Fire Resistive Metallic HVAC Duct Systems ISO 6944-1Fire Containment – Elements of Building Construction – Part 1: Ventilation Ducts

Scope of Inspection

Grease Duct SystemsEnsuring commercial kitchen exhaust ducts comply with fire-protection requirements HVAC Air Duct SystemsVerifying ductwork integrity and installation quality across fire compartments Hazardous Exhaust SystemsSpecialized inspections for chemical, laboratory, and energy sector ventilation systems

Inspection Procedure

一、Preparation Stage Review technical documents and listed product data Verify materials and components (steel thickness, fireproof coatings, reinforcement, etc.) Develop on-site inspection plan 二、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) 三、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-Resistive 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