24V DC Cooling Fan how love how loaded

1, "24V DC Cooling Fan" ambient temperature should 75ºC≥-40ºC.
2, through the cooling fan does not allow industrial gas acids, alkalis and various solutions.
3, "24V DC Cooling Fan" does not allow dust and other debris fall into the fan, so as to avoid burning and fan blades break.
4, before installation should first check whether damage caused due to packing and shipping, deformation, deformation should be repaired if damaged or after installation.
5, and then check the "24V DC Cooling Fan" all parts and screws are loose; whether touching or shift between the blades and duct before installation if the touching or shift should be adjusted.