When buying, keep in mind that the manufacturer provides only one way to lay wires to the fan terminals. Because I had already done the wiring, then I had to : I drilled holes for the wires in the upper left corner, rearranged the terminals and you're done. I attached it with double-sided adhesive tape, turned it on to work 24/7, compared to the electrolux, which failed after 3 weeks of such work, this fan is just gold. I recommend to buy.