Actually, this should be a simple fix. Go to a nearby Home Depot, Lowes, etc. and ask to see a vinyl gable vent. Sometimes you have to ask a few people. These are prefabricated to certain sizes. I've seem them as Octagons, Half Moon (what I have) and Circles. All installation is done from the outside. They're not very expensive and any competent home handyman should be able to install them. There is a base with a nail fin that is attached to the house and then a snap ring that covers up the nail fin for a finished look. The one I have I suspect would protect from horizontal rain. I had mine installed while I was having the roof redone. I was even able to match the trim paint color to the gable vent color. I've seen them in white, dark gray and tan. Hope this helps |