"AC Fan" after installation, flip a hand wheel, check whether tight or grazing to other sites. In the absence of exceptional circumstances, you can test run, the exposed part of the fan drive apparatus should be shielded, which in the "AC Fan" is not the whole package, user supplied, if the air inlet pipe is not connected, then, also need to add a protective cover. The fan is equipped with electronic control box must match the fan phase. In particular, note that, when the fan wiring, be sure to get a professional electrician wiring, the wiring must be correct and reliable, especially at the electrical control box terminal number must be consistent with the fan numbers on the fan after installation to check the entire installation the "AC Fan" living within the impeller is not a tool to pull down or other debris.