Smoke Prevention and Exhaust Duct Inspection Service for International Building Safety
As an ISO/IEC 17025 accredited laboratory, we deliver a specialized smoke prevention and exhaust duct inspection service designed to verify the fire resistance, smoke leakage integrity, structural durability, and corrosion protection of ductwork systems. Our smoke prevention and exhaust duct inspection service supports manufacturers, exporters, and contractors who must demonstrate compliance with EN 12101-7, EN 1366-1, ISO 6944, and regional mechanical codes across the European Union, North America, the Middle East, and Asia Pacific. Every test is conducted under our CNAS-accredited quality system, generating reports that are accepted by notified bodies, building control authorities, and fire engineering consultants worldwide.
Product Samples We Regularly Test in Our Smoke Prevention and Exhaust Duct Inspection Service
- Single-compartment and multi-compartment fire resisting ducts — for kitchen extract, car park ventilation, and pressurization systems
- Smoke extraction ducts and environmental control ducts — for atria, shopping malls, and high-rise evacuation routes
- Welded and flanged steel exhaust ducts — with fire-rated insulation and intumescent wraps
- Stainless steel and PIR insulated grease exhaust ducts — for commercial kitchen hood and fire-rated riser applications
- Rectangular and circular fire resisting dampers integrated into ducts — motorized smoke and fire dampers for tunnel and metro ventilation
- Fabric and flexible smoke exhaust connectors — for seismic joints and vibration isolation in fire-rated duct runs
- Access panels, cleaning doors, and support hangers — components that must maintain the fire integrity of the complete smoke prevention and exhaust duct system
Fire Resistance and Integrity Testing of Smoke Prevention and Exhaust Ducts
- Fire resistance test for ventilation ducts per EN 1366-1 and ISO 6944 — the duct section is installed in a furnace and subjected to the standard time-temperature curve while maintaining an internal pressure differential. Thermocouples measure the temperature rise on the unexposed side and cotton pad or gap gauges detect flame penetration, establishing the fire resistance rating for integrity and insulation.
- Multi-compartment fire test for smoke extraction ducts per EN 1366-8 — a full-scale duct assembly passes through multiple furnace zones to simulate the duct crossing from a fire compartment into another zone, verifying that the duct does not propagate fire beyond the compartment of origin and maintains smoke extraction function.
- Horizontal and vertical fire resistance classification per EN 13501-3 — the duct system is classified for fire exposure from inside the duct, outside the duct, or both, and the test report includes the permissible support spacing, joint configuration, and maximum allowable dimensions for field installation.
- Fire damper and duct integration testing per EN 1366-2 and AS 1682.2 — a fire damper installed within the duct is tested as a complete assembly to verify that the closure mechanism, thermal release, and blade sealing achieve the rated fire resistance without bypass leakage around the damper body.
Smoke Leakage and Air Tightness Verification for Exhaust Ducts
- Smoke leakage test per EN 1366-1 and ISO 5925-1 — the duct is pressurized and the volumetric leakage rate is measured under ambient and elevated temperature conditions, classifying the duct as Class A, B, C, or D according to the permissible smoke leakage per unit area for smoke prevention ducts in life safety systems.
- Air tightness classification per EN 12237 and Eurovent 2/2 — the ductwork is tested under positive and negative pressure to quantify the air loss in liters per second per square meter, ensuring the exhaust fan energy consumption and smoke extraction performance are not compromised by excessive leakage at joints and seams.
- Pressure decay and tracer gas smoke detection per ASTM E741 and customer protocols — a non-toxic tracer gas is injected into the sealed duct and the concentration decay is monitored to locate leak paths with high sensitivity, used for commissioning and forensic investigation of smoke spread incidents.
- Leakage under fire-induced thermal expansion — the duct is heated to a defined temperature while pressurized, and the change in leakage rate is recorded to verify that thermal expansion of the duct does not open leak paths at flanges, slip joints, or access doors.
Structural and Mechanical Durability Testing of Smoke Prevention and Exhaust Ducts
- Static load and deflection test per EN 12101-7 and ASHRAE 126 — the duct span is loaded with a distributed weight to simulate the self-weight of the insulation, the accumulation of dust, and the pressure differential, and the mid-span deflection is measured to confirm the duct will not sag or disconnect from hangers during a prolonged fire.
- Pressure cycling and impulse fatigue for exhaust ducts per EN 1507 and customer specifications — the duct is subjected to repeated positive and negative pressure cycles to simulate the start-up and shut-down of smoke exhaust fans, and the air tightness and structural integrity are reassessed to confirm no fatigue cracking at welded or bolted connections.
- Vibration and seismic resistance per IEC 60068-2-6 and building code requirements — the duct and its support system are vibrated at the fundamental frequency of the building and subjected to a simulated seismic event to verify that the fire-resisting ductwork remains intact and the fire dampers close reliably.
- Fastener pull-out and support bracket load capacity per ASTM D1761 — the load-bearing capacity of the anchor bolts, threaded rods, and brackets is tested to ensure the complete duct assembly can be safely suspended and will not collapse during firefighting operations.
Corrosion Protection and Environmental Durability Inspection for Exhaust Ducts
- Salt spray and cyclic corrosion resistance per ISO 9227 and ASTM B117 — galvanized steel, stainless steel, and coated duct sections are exposed to salt fog for up to 1500 hours, then inspected for red rust, white corrosion, and pitting to ensure the smoke prevention ductwork remains structurally sound in coastal, marine, and industrial atmospheres.
- Chemical resistance to cleaning agents and kitchen effluent per ISO 175 and ASTM D543 — duct materials are immersed in hot alkaline degreasers, acidic cleaners, and simulated grease condensate to verify the coating and base metal resist chemical attack during routine kitchen exhaust duct maintenance.
- UV and xenon-arc weathering of external duct coatings per ISO 4892-2 and ASTM G155 — for externally mounted exhaust ducts on facades and rooftops, the coating is aged under simulated sunlight and rain to guarantee color retention, adhesion, and corrosion protection over the building's design life.
- Thermal aging and insulation integrity at maximum operating temperature — the insulated duct is conditioned at its maximum declared operating temperature for an extended period, and the thermal conductivity and fire performance are retested to confirm the insulation has not settled, cracked, or lost its protective function.
Report Recognition and ISO/IEC 17025 Compliance
All test methods described in this smoke prevention and exhaust duct inspection service fall within our ISO/IEC 17025 scope of accreditation. Our reports are accepted by European notified bodies for CE marking under the Construction Products Regulation, by North American building officials and fire marshals referencing NFPA 96, UL 1978, and IMC, and by regulatory authorities and fire safety consultants across the Middle East, Australia, and Asia. Whether you require a complete initial type test for a new duct system, a batch inspection of production ducts, or a forensic failure analysis of a smoke control system, our laboratory delivers the measurement accuracy and code expertise that the global fire safety industry demands.
