Go through Ventilation Fan which appears that attic ventilation fans are a cheap and efficient way to keep your home cool, whether it is hard-wired or powered by their own solar panels. However, the usefulness of this fan is a very contentious subject. Fan efficiency is decreased by effective insulation. Ventilation Fan is now available in a few ranges like Electric Smoke Ejector Ventilation Fan, Positive Pressure Ventilation Fan, and Smoke Extraction Fan. This is a must in every home since they extract and discharge stagnant, dirty air and odor from bathrooms or other enclosed areas. This is safe to use.