4 inch vents

We have had a few inquiries about 4 inch vents. As our videos state, we dont make a cover for a 4 inch vent. The reason is that they are uncommon, primarily being used on older homes, and we are having some supply issues that make them prohibitively expensive. They also dont look that good, and we would rather not have a product and loose a sale than put out something that isnt up to snuff. We will keep working on it and see if we can come up with a solution.