With the pipe taken off, you ought to be in a position to see into your leading in the wood stove and locate the piles of creosote. Vacuum these out and replace the stove and stove pipe. An insert, or prefab fireplace, is product of metallic, not brick or stone. https://louisnhymc.dgbloggers.com/28456619/an-unbiased-view-of-gas-fires