FITMENT: Select Jenn-Air Designer Line Ranges & Cooktops This is a genuine Jenn-Air cover and is brand new in the factory packaging. This cover adds a clean look to your Jenn-Air Designer Line electric cooktop. This one-piece cover fits select models perfectly to keep the griddle or grill dust-free for the next use. The widest outside dimensions are approximately 20-3/4″ by 11-1/4″ and the inner dimensions of what it actually fits over are approximately 19-1/4″ by 10-3/4″ and approximately 3/4″ deep.