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If your gas fireplace is vented through a chimney, a chimney cap is highly recommended. While not all gas fireplaces require a traditional chimney, for those that use one, a cap provides several key benefits. It prevents rain, debris, and animals from entering the chimney, which can cause blockages or damage. A cap also helps prevent downdrafts that could push harmful gases like carbon monoxide back into your home. When installing a cap, ensure it is appropriate for a gas fireplace and does not restrict proper ventilation.

The damper, located just above the firebox, can open or close the chimney flue. The damper should remain closed unless there’s a fire burning in the fireplace. Closing the damper prevents energy loss through the chimney and cold air from seeping into the home during the winter. Opening the damper helps maintain airflow when there is a fire and prevents smoke and gases from venting into the house.

Yes, you should seal and cap an unused chimney to protect it from damage. Sealing the structure helps prevent moisture damage, which can lead to issues like cracks, spalling, efflorescence, and damaged mortar joints. Capping the chimney is also crucial to prevent blockages, damage from invasive critters, and downdrafts, while still allowing for proper air ventilation to manage moisture. For the best results, consult a chimney professional to select the right type of chimney or flue cap for your home. It's also wise to continue with annual chimney inspections to maintain the structure's integrity.

Deciding whether to buy a prebuilt fireplace kit or build one from scratch comes down to aesthetics, available space, and budget. Many homeowners like the convenience and lower cost of prebuilt options—around $1,500—versus the involved planning and construction of a larger fireplace. Another bonus: you can usually move prebuilt units. Custom projects are more common when homeowners have access to a larger budget and more area in the yard to place the fireplace.