Split your attic's total square feet of required venting ... evenly spaced along the soffits or roofline. Space exhaust vents evenly across the roof as well. From the attic, drive a nail through ...

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 ...