I’ve been planning on using a piece of 1/8” steel for floor protection. I have found a couple that are purpose made as floor protection but are too small for what I’m doing. So I was just going to buy a piece from a steel supplier. The manual only states “non-combustible, type 1” but the placard on the stove adds “UL APPROVED...TESTED IN ACCORDANCE WITH UL 1482”. Does that mean I have to buy one with the ul listing or is steel on a list of ul approved materials?