My fireplace door lid (the best just one) does crack a tiny bit and warp some Once i'm working, but it surely will not hassle me - I run my smoker Using the vents mainly open up along with the side hearth door at a fantastic one inch cracked open https://kylerspict.blog2freedom.com/14229405/the-smart-trick-of-old-country-bbq-pits-over-and-under-smoker-that-nobody-is-discussing