Our Designer Series Gable Vents offer a wide trim ring that gives a bold and dramatic finished look. For the 30" Round Gable Vent with Keystones, the entire piece is one piece including the vent, trim ring and keystones. This face snaps onto the baseplate. The 28" Round Gable Vent without keystones, as well as all other gable vents, are installed with the snap-on trim ring. No matter which vent you choose, there will be a finished appearance once the vent has been installed. Some styles can be modified to add keystones. Just look for the "K" after the size for availability. "Classic Style" vents vary from other standard vents because the frame is slightly wider and has more detail.
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