Oven Add-a-Shelf Extra Rack For Cookers 1 "Panic --Blue smoke from oven" Mrs Judith Fisher 16 July 2010 Measured my gas oven carefully and double checked that the shelf was suitable for gas. BUT on first use I smelt burning in the oven and discovered that the rear of the shelf was in close proximity to the gas flame. This had heated the bars and they were emitting fumes. The chrome had burnt off. My husband was not amused as a retired fire officer. NOT suitable for gas ovens. A note from the team Thank you for your review. I was sorry to learn that the oven shelf had burned. From feedback from yourself and our customers, we have found that the oven shelf is not suitable for ovens where the shelf can come into direct contact with a flame, or where the heating element is at the bottom of the oven. We'll be in touch shortly to help.