My wife and I are purchasing a new home and we're going through the inspection and repair process with the sellers. The home is a center hall colonial with an exterior two-story brick chimney. The clay liner in the wood-burning fireplace flue is damaged and I'd like to ask the sellers to have it lined with stainless steel. I plan on installing a fireplace insert similar to the HI300 somewhere in the near future, and I'd like to avoid shooting myself in the foot by having the sellers install a liner that won't meet the needs of my eventual insert. Is there anything special I should ask for, or are these liners standard enough that whatever they have installed will be compatible with my insert later on?