| Airflow Capacity | m³/h or CFM | Compare the rated airflow at the same operating point, fan speed, and installation condition. | Airflow determines how much air the fan can move through a room, duct, warehouse, or process area. | Performance curves tested in accordance with ISO 5801 or AMCA 210. |
| Static Pressure | Pa or in.w.g. | Check available pressure at the required airflow, especially for ducted systems, filters, louvers, and grilles. | A fan with high free-air flow may deliver substantially less air when system resistance increases. | Certified fan curve showing airflow, pressure, speed, and power at multiple operating points. |
| Fan Efficiency | Total or static efficiency (%) | Compare efficiency at the actual duty point rather than relying only on the maximum published value. | Higher efficiency can reduce electricity consumption and operating cost over the fan's service life. | Test data based on ISO 5801, AMCA 210, or the applicable regional testing method. |
| Energy Consumption | Input power in W or kW | Compare electrical input at equal airflow and pressure, including motor, controller, and drive losses where applicable. | Input power provides a practical basis for estimating annual energy use and total cost of ownership. | Measured power data, duty-point calculations, and operating-hours assumptions. |
| Motor Efficiency | IEC efficiency class | Confirm the motor rating and efficiency class, such as IE3 or IE4 where applicable. | Efficient motors generally reduce losses during continuous commercial operation. | Motor nameplate, manufacturer test report, and applicable IEC 60034 documentation. |
| Speed Control | EC motor, VFD, or multi-speed control | Assess controllability, minimum stable speed, control signal compatibility, and response to demand. | Variable-speed operation can improve comfort, noise control, and energy performance when demand changes. | Control wiring diagram, speed range, compatible signals, and commissioning instructions. |
| Noise Performance | Sound power or sound pressure in dB(A) | Compare noise values measured at the same distance, speed, airflow, and test environment. | Noise affects suitability for offices, retail spaces, hospitality areas, schools, and occupied industrial facilities. | Acoustic test conditions, octave-band data where available, and declared measurement distance. |
| Operating Environment | Temperature, humidity, dust, and corrosion resistance | Verify suitability for indoor, outdoor, humid, dusty, chemical, washdown, or high-temperature conditions. | Environmental compatibility influences reliability, maintenance frequency, and service life. | Application rating, material specification, coating details, and installation limitations. |
| Ingress Protection | IP rating under IEC 60529 | Compare protection against solid particles and water according to the actual installation environment. | The correct IP rating helps protect electrical components from dust and moisture exposure. | Declared IP rating and documentation identifying which components the rating covers. |
| Construction Quality | Materials, balance, bearings, and assembly | Review housing material, impeller construction, dynamic balancing, bearing type, fasteners, and protective finishes. | Mechanical quality affects vibration, durability, service intervals, and long-term operating stability. | Technical drawings, material declarations, balancing records, and quality-control procedures. |
| Safety Features | Guards, thermal protection, isolation, and emergency controls | Check guarding, motor over-temperature protection, electrical isolation, and access requirements. | Proper safety provisions reduce risks during operation, cleaning, inspection, and maintenance. | Risk assessment, wiring diagram, safety instructions, and applicable conformity documentation. |
| Reliability Validation | Testing and quality management | Compare production testing, vibration checks, electrical testing, endurance validation, and traceability. | Documented validation provides stronger evidence than marketing claims alone. | Factory test records, inspection plans, quality certifications, and serial-number traceability. |
| Installation Flexibility | Mounting, orientation, and service access | Assess ceiling, wall, roof, inline, or floor installation options and the space required for maintenance. | Easy installation can reduce labor cost and simplify future servicing or replacement. | Dimensional drawings, mounting instructions, clearance requirements, and accessory list. |
| Maintenance Requirements | Inspection and service intervals | Review filter cleaning, bearing maintenance, belt inspection, impeller cleaning, and spare-part availability. | Predictable maintenance supports uptime and helps control lifecycle expenses. | Maintenance schedule, parts catalogue, service manual, and recommended inspection procedures. |
| Total Cost of Ownership | Purchase, installation, energy, and service cost | Evaluate the full lifecycle cost rather than comparing purchase price alone. | A lower initial price may be offset by higher energy consumption, downtime, or maintenance costs. | Five- to ten-year cost model using verified power data, operating hours, tariffs, and service assumptions. |
| Documentation and Support | Technical and after-sales support | Compare manuals, selection software, spare-parts support, training, warranty terms, and response time. | Clear documentation and responsive support reduce commissioning errors and downtime. | Complete technical file, warranty conditions, local service contacts, and documented response procedures. |