A roof extractor fan is a ventilation system that moves hot air and moisture up through the attic vents, which can help prevent mold and mildew. They are also a great way to reduce energy costs. The silver spherical fans are a common sight atop commercial buildings, but they can also be used in residential roofs. There are several different types of attic fans, including wind-driven and electrical. Wind-driven fans operate on the power of wind, and are the cheapest option. Electrical attic fans can be powered by a solar panel or hardwired into the home and controlled by a switch.

Installing an attic fan is fairly simple. Start by drilling a hole in the attic where you want the vent to be. Then, use a jigsaw to cut the vent hole and remove the asphalt shingles from around it. You may also need to add insulation to the attic floor.