| Fire and Heat Resistance | Confirm the fan’s rated operating temperature and any short-duration high-temperature rating. Fire-rated smoke-extraction systems commonly require project-specific ratings such as 250 °C for 2 hours or 300 °C for 1 hour, depending on the applicable design standard. | Temperature-time test report, complete fan model identification, test duration, mounting position, rotational condition, and pass/fail criteria. | Critical | Select a manufacturer that tests the complete fan assembly rather than relying only on the temperature rating of an individual motor, cable, or material. |
| Applicable Standards | The product should be assessed against the standards specified by the destination market and project. Relevant references may include EN 12101-3, ISO 21927-3, or local smoke-control and fire-safety codes. | Current certificates, accredited laboratory reports, certificate scope, model range, test configuration, and certificate validity. | Critical | Check that the certificate applies to the exact construction, impeller arrangement, motor type, voltage, and operating mode being purchased. |
| Airflow and Static Pressure | Performance must be verified at the required duty point, including airflow in m³/h or m³/s and static pressure in Pa. A fan should not be selected from airflow alone because duct resistance changes the operating point. | AMCA- or ISO-based performance curves, test conditions, air density, speed, power input, and efficiency data. | Critical | Compare the certified fan curve with the project system-resistance curve and require sufficient margin without excessive motor loading. |
| Motor Insulation and Protection | Motor insulation, cooling method, thermal protection, enclosure rating, and service temperature must match the application. IEC 60034-5 is commonly used for motor enclosure protection classification. | Motor datasheet, insulation-class information, IP test details, thermal-protection method, bearing specification, and wiring diagram. | Critical | Verify whether the motor remains inside the fire zone or is positioned outside the hot airstream; these designs have different thermal requirements. |
| Electrical Compatibility | Confirm rated voltage, frequency, phase, starting current, full-load current, speed-control method, and compatibility with variable-frequency drives where applicable. Common industrial supplies include 380–415 V and 50 Hz, but the project supply must control the selection. | Nameplate sample, wiring diagram, motor test data, electromagnetic-compatibility documentation, and VFD compatibility statement. | Critical | Require the manufacturer to validate the complete fan-and-control package instead of approving the motor and controller separately. |
| Ingress and Corrosion Protection | The enclosure protection level should be selected according to dust, water, humidity, and installation conditions. IP ratings are defined by IEC 60529; the required rating depends on the actual environment. | IP test report, coating specification, material certificates, salt-spray or corrosion-test results where relevant, and fastener material details. | High | Favor designs using suitable galvanized steel, stainless steel, or protective coatings, with documented surface-treatment thickness and process control. |
| Mechanical Reliability | Key checks include impeller balance, shaft alignment, bearing life, vibration level, guard strength, and structural integrity. ISO 21940 is a recognized reference for rotor balancing. | Dynamic-balancing records, vibration measurements, bearing data, weld inspection records, and factory run-test reports. | Critical | Request vibration data at the specified speed and duty point, and confirm that the tested configuration matches the production configuration. |
| Material Traceability | Critical materials should be identifiable from procurement through assembly, especially impeller steel, shaft material, motor, bearings, insulation, and fire-resistant cable components. | Batch records, material certificates, incoming-inspection reports, serial-number system, and final inspection checklist. | High | A traceable production system reduces the risk of undocumented substitutions and supports investigation or warranty claims. |
| Quality-Control Capability | A capable factory should control incoming materials, welding or forming, balancing, painting, motor assembly, electrical testing, dimensional inspection, and final performance testing. | Quality-management certification such as ISO 9001, inspection and test plans, calibrated-equipment records, nonconformance procedures, and corrective-action records. | Critical | Use a factory audit or remote production audit to verify that documented procedures are followed on the actual production line. |
| Customization and Engineering Support | The manufacturer should be able to adapt airflow, pressure, voltage, rotation, inlet/outlet orientation, mounting, accessories, controls, and environmental protection without invalidating required testing. | Approved drawings, calculation notes, selection software or worksheets, sample engineering-change records, and application references with technical details. | High | Evaluate the quality of technical submittals, response time, drawing accuracy, and ability to identify conflicts before production. |
| Testing and Documentation | A complete supply package should include performance data, dimensional drawings, wiring diagrams, installation instructions, maintenance requirements, spare-parts information, and inspection records. | Pre-shipment inspection report, factory acceptance-test format, operating manual, declaration of conformity where applicable, and packing-list controls. | Critical | Treat missing or inconsistent documentation as a project risk, even when the quoted fan price is competitive. |
| Delivery and After-Sales Support | Lead time should be stated for engineering approval, component procurement, production, testing, and shipment separately. Spare-parts availability and warranty terms should be documented. | Production schedule, capacity statement, warranty policy, spare-parts list, service-response procedure, and previous export documentation. | High | Prefer suppliers that provide a clear escalation process, stable replacement-part supply, and technical support in the destination market. |
| Total Cost of Ownership | Compare purchase cost together with energy consumption, installation, controls, maintenance, spare parts, inspection, downtime, and expected service life. | Motor efficiency data, power-consumption figures at the duty point, maintenance schedule, replacement-part prices, and lifecycle-cost calculation. | Critical | The best manufacturer is not necessarily the lowest-price supplier; select the solution that satisfies safety, performance, compliance, and lifecycle requirements. |
