Venting pellet stove through existing chimney?

Friend has an existing factory built 6" stainless steel chimney, currently being used for a wood stove. He would like to swap out the wood for a pellet stove. Any reason or code that says you cannot do this? Also if allowed what type of pipe would you use to connect the pellet stove to the

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Venting pellet stove through existing chimney?

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