My stove has a heat shield at the top of the firebox, that feels like its made of pretty weak material. I'm going to clean my chimney, and want to remove this so that the soot falls into the firebox, and not on top of the heat shield. There are three pipes, though, that run left to right at the top of the box. I think I might be able to get the shield out without taking off the pipes, but I don't want to break the shield in the process. Do I just unscrew the pipes and take them down? Advice would be appreciated. Thanks!