OEM parts are supplied under the original manufacturer specification. Compatible parts are made by another supplier to perform the same function and require documented compatibility verification.
Yes. Packages can be numbered and loaded according to site priorities, but container stability, weight distribution and customs inspection must also be considered.
A test report records test methods and results for a specimen. A certificate states conformity under a defined certification scheme and scope; neither should be used outside its stated coverage.
Requirements include main and temporary power, voltage, frequency, phase, capacity, grounding, protection and lighting as defined in the electrical drawings.
Check the controller series, software version, communication protocol, input voltage, motor type, encoder type, I/O configuration and existing wiring. Do not rely on appearance alone.
Compare airflow at the actual installation resistance, noise data under stated test conditions and the available mounting space. Check vibration isolation, grille restrictions and electrical supply. A lower free-air noise figure alone does not guarantee a quieter cabin once the fan is installed.