"Exhaust Fan" power lines yellow and green wire must be grounded; "Exhaust Fan" power try to pick an all-pole switch; the top of the ceiling must be set to check the hole; remind everyone must avoid gas through the airway open and other pyrotechnic reflux device channels; pipeline must not be bent in a V-shaped, bell-shaped and other shapes carry impede air circulation; you must set up a room with the exception of the air intake, in order to ensure fresh air; this product please fans during operation, Do not washout in the body; "Exhaust fan" Friendly remind users of such fan disassembly or cleaning, you must first cut off the power. (Remember)