You can't weatherstrip the damper (that would be a fire hazard), so build a rustic reclaimed wood fireplace insert to stop drafts. Easy to follow step-by-step tutorial.
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Build a Fireplace Insert Draft Stopper - Pretty Handy Girl
Cheapest Way Of Making A Chimney Draught Stopper, 52% OFF
Brittany (@PrettyHandyGirl) / X
Cheapest Way Of Making A Chimney Draught Stopper, 52% OFF
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