No it wont move much if there is pour in but it also wont drop. if you cant tell weather the liner is hanging or not you should not remove the top clamp. Believe me you don't want have to fish that liner out of your chimney if it drops it is a real pain in the ass. Yes the liners can be moved with pour in insulation if need be we do it with a pulling cone and a hoist it isn't easy but it can be done.
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