Can I seal these vents on my gas fireplace? Cold air constantly coming into house. No warm air coming out of them when fireplace runs. : r/Fireplaces

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What is the difference between open and glass fronted fireplaces?

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In western countries, why are fireplaces or range typically placed up against the wall (where heat goes out of that wall) rather than in the centre of room as 'masonry stove' or

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