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There are several ways to determine if your chimney or fireplace damper is open or closed. A simple method is to check for airflow by placing your hand near the fireplace opening; if you feel a draft or hear wind whistling, the damper is open. An open damper might also make the room feel cooler, similar to the outdoor temperature, or cause your HVAC system to work harder than usual. For a more definitive test, you can try a visual inspection, although it may be difficult to see. Alternatively, you can light a small piece of paper and observe the smoke; if it is drawn up the chimney, the damper is open. Always use the damper handle to adjust its position.

Chimney crowns may be stone, concrete, or metal but most crowns are made of concrete. It’s not recommended to build chimney crowns with mortar (which is different from concrete) due to it’s weaker composition (especially when exposed to the outside elements). Most chimney crowns are custom made to fit your home’s specific chimney.

Fireplace inserts have several potential disadvantages. The cost of the insert and its installation can be a significant investment, as the process can be complicated and expensive, particularly if modifications to the existing fireplace are necessary. Aesthetically, some people find that inserts lack the traditional look and authentic ambiance of an open, crackling fire. There are also ongoing costs for maintenance, cleaning, and fuel. Fuel type can be a limitation; for example, an insert may be unusable if you don't have access to its specific fuel source. Maintenance and repairs can also require specialized services, especially for gas or electric models. Finally, while an insert is more efficient than an open fireplace, it may not heat a home as evenly as a central HVAC system.

Costs depend on material type, labor, chimney requirements, and structural reinforcements.