How to cover this mail slot up so cold air won't come in?

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It had a mail slot that was painted shut so I opened it rquilting · Ideas for a quilted fireplace draft cover? 7 upvotes · 17

Check out our mail slot cover selection for the very best in unique or custom, handmade pieces from our home & living shops  Reproduction interior mail slot Matching exterior slot available 2 Finishes, Brass and Antique Pewter 8-12 length with a 5-34 width

drive array controller failure (slot 0) Made from high impact ABS plastic and anodized aluminum, the No-Draft Mail Slot will not rust or tarnish over time A detachable rear chute cover provides mail, which fits quite nicely through your mail slot along with all the real mail, unwanted faxes tie up your fax lines and use up your expensive fax