Both intake air vents and exhaust air vents are installed in conjunction with a roof exhaust fan. The vents improve air circulation, helping the fan to lower the temperature in the attic, cooling down the rest of the home in the process.
Air intake vents are installed around the perimeter of the roof line, under the eaves. Commonly called soffit vents, they draw cooler air into the attic, which forces the warmer air up towards the roof. The fan accelerates this process.
Soffit vents are available in a continuous style, which are filled with tiny slots and cover much of the eaves. Another option is the drip edge vent, which fits around the eave with the slots on the bottom end. The individual soffit vent is shorter than the continuous vent and has fewer slots. These are spaced along the underside of the eaves.
Exhaust vents push hot air out of the attic. One of the most effective options is the ridge vent, located along the top of the roof peak. They can be hidden under shingles or used as caps to cover the ridge line. Static vents are individual vents that are placed near the ridge line. These also work well on flat roofs, which have no ridge line.
Gable vents are also an option. A gable is the triangular area on either end of a peaked roof. The vent fits in the top of the triangle. Used alone, these vents provide little circulation, but in combination with ridge line and soffit vents, they are very efficient. Exhaust fans that fit in front of the gable vents are also available.