The Frontloader™ is designed with firing elements in the top, but sides AND the floor! When you want to take advantage of surround firing, you can use one, two or all three of these firing shelves! Each shelf measures 2 1/4" x 3 1/2” x 1/2” high. This gives you 6 square inches of firing surface. Combine all three and you have 18 square inches of firing surface! That is a LOT of creations in a single firing!