Product review (4 stars): my oven is only 26 inches wide and one liner gives me great coverage. I imagine that you might have to ...
These fit perfectly in my oven. In the description it is suggested that they would work well in oven's up to 30 inches, however, my oven is only 26 inches wide and one liner gives me great coverage. I  imagine that you might have to cut and fit another for a 30 inch oven. As far as the product itself, I am very pleased. There have been NO strange odors from them heating up and the coverage it offers keeps the bottom of my oven clean.