I have a Concept ll fireplace box/blower that I’d like to sell. I believe it was put in my house in 1975. I am the 3rd owner and have used it only 2x in 7years. I am converting it back to gas. Can anyone give me a fair price on what it could be worth? It probably weighs 500 lbs, it took 3 guys to take it out of cavity. It has all the parts/blower/door handles, etc. Please help with any advice on how to salvage this beauty for someone who loves burning wood. I do not. TIA