"Exhaust Fan" in peacetime did not seem much use, so there are many friends in the home decoration, they also do not pay attention to ventilation fans installed ventilation fans with some quality problems, wait until you need to use a little better to know the original function of the ventilator how important. Ventilator function in order to be fully exploited, we must first start from the ventilator and installation options. When selecting the size of the space with the ventilator to be selected, fan to exhaust air cubic feet per minute (CFM) rating, simply use the length and width of the space is multiplied by one seven, you can find the desired row gas fan series. Thus it is possible to choose the time to compare your bedroom fan installation.