Absolutely, I would NOT cover the vent. You are correct in that you'd definitely obstruct the natural cooling of that space by covering it up. Soooo, what can you do?

Well, visit some LUmber Yards and Home Centers to see how these vents are made today. Today, you almost need a horizontal rain, or worst, to have water get in them. I don't think an 'overhang' of any type is a good idea because it will 'trap' warm air and indirectly may inhibit the flow (unnaturally).

You may not need access to the attic space to replace the vent (if that's an option.) If access is needed, I'd have a Pro look at the 'situation' first to see what should be done. Sometimes, hiring a Pro makes good sense.

My best to ya and hope this helps.

Jay J -Moderator

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

My best to ya and hope this helps.

Jay J -Moderator

PS: H.D. can't stock everything BUT, usually, what they don't stock can be ordered ...