This fireplace blocker blanket can prevent the cold air in the house leaking to the chimney in summer and the hot air flows into the house from the
Pavenex® Fireplace Blanket Stops Overnight Heat Loss - Plow & Hearth
2 PCS Magnetic Fireplace Draft Stopper Fireplace Cover to Block Cold Air 101.6 x 15.24cm
If radiation doesn't heat up the surrounding medium, then why does the area around a fireplace feel warm? - Quora
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