Purchase the exhaust fan (if you don't already have one) and a roof vent. Roof vents can be dome-shaped, square (like the one shown here.), rectangular or chimney-shaped. They all have a cap over ...

They're a key part of your roof system designed to let hot air out of your attic. But, as you might have guessed, it gets a little more complicated than that. Box vents are usually squarish ...