4 Insulation
Ridge exhaust vents extend along the entire length of the roof, running parallel to the edge. They aren’t noticeable enough to distract from the roofline. Although static vents can stand out, they can have covers that block rain, snow and sleet. Some of these static exhaust fans have enclosed fans. Powered exhaust fans are powered with solar- or electric motors that turn on when attic temperatures reach a specified limit.
Bob Vila explains how attics have intake vents beneath the roof's edges that let in cool and hot air, as well as hot exhaust vents at roof peak that let off hot air. The intake vents are either installed in the roof soffit in one continuous perforated piece, or individually spaced out over a few feet. Gable roofs have the vents located near the top of each gable.
Baffles work by preventing the flow or fluids of gases, liquids and air. Attic Air claims the baffles help to maintain proper airflow, and they prevent insulation from getting in the way of vents. They can be made out of PVC, rigid waterproof foam, cardboard or plastic. They are installed on the attic ceilings between the rafters, at the places where the attic roof meets your attic flooring.