kul grilles can manufacture custom sizes. Our standard vent cover sizes are listed on the website. If you require a air vent cover that is not listed, it will be a custom grille.
We do have the capabilities to manufacture custom vent cover to suit almost any specification however we typically require a 10-grille minimum due to manufacturing setup fees, administrative fees and customization.
kul grilles air vent covers can be built as long (wide) as you want! Our grilles come in sections of 6 foot lengths (with the core bars running parallel to the length) and are spliced together at the job site. The longest continuous air vent cover we can make is 6 feet long. The maximum height we can build is 24 inches.