How to buy a fan

Each industrial electric fans watching random file random file includes instructions, product certification, electrical wiring diagrams and packing slips, purchase inventory in accordance with the packing list, check the quantity and quality components.
Look grille and fan there is an obvious distortion in the assembled fans cast nets, a fan with a pen pointing to the highest point, slowly moving blades, a few other points that corresponds to the distance from the blade tip shall be very close, and then turn the blades, to observe the rotation is light and flexible, and can be stopped at any position.
Look control mechanism is flexible control mechanism includes speed control switch, timer knobs, toggle switch, light switch, etc. These control mechanism should be flexible operation, heater with fans reliable contact. To speed block, two block at the same time are not allowed to turn on or does not go a block by the phenomenon. Press the stop button, each speed gear should be normal reset button