Detail the most visible area of your HO Scale buildings - the roof! This highly realistic set is a great value, with parts for 62 vents in 10 different styles. A surprising variety of vents are found on industrial buildings, so you can install several styles as desired. You'll also find smaller vents on commercial buildings, such as restaurants. With some careful cutting and fitting, many can be adjusted to fit peaked roofs, or simulate wall-mounted units.