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Your fireplace flue is open when the chimney is unsealed and open to the outside air and sky. That’s why one of the best ways to figure out if your flue is open is to visually check for daylight inside of your chimney—or to feel for a draft, which may be generated by the difference in temperatures inside and outside of your home.

Chimney crowns should be at least 2 inches thick at their thinnest point. If the crown is thinner than 2 inches, it’s more likely to be damaged and allow water to seep into the chimney.

No. Removing the cause of concern will only lead to deeper concern. You cannot use any fire-powered appliance like a fireplace or furnace without an escape route for the smoke and fumes. If you remove the flue intending to repair or replace it, you should only use the fireplace, wood stove, or furnace once the flue is in working order. If you cannot replace the flue you have removed, call a chimney repair professional immediately.

Yes, if your gas fireplace has a flue, you typically need to open it when using the fireplace. Although gas fireplaces don’t produce the type of smoke and soot that wood-burning ones do, they still release combustion gasses like carbon monoxide. Opening the flue ensures these gasses safely exit your home through the chimney. Not all gas fireplaces need a chimney, however. Always check the manufacturer’s instructions for your specific gas fireplace model, as some newer models may have different ventilation requirements.