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Yes, you need to leave your chimney damper open when burning a creosote log so that smoke and other debris doesn’t waft into your house as it’s burning. You’ll need to make sure your damper is fully open, even when the log continues to smoke, until it’s completely out and cold.

There are a few things you can look out for to ensure your chimney is safe to use. Check for the following issues:

• Cracks or missing pieces in the masonry of the chimney

• Creosote buildup in the chimney, which is a black, tar-like substance

• Cracks, stains, or scorch marks in the firebox

• Water stains in or around the fireplace

• A broken or stuck damper

Chimneys should either be sealed or waterproofed, which is different from sealing off—closing at both ends—a chimney. Waterproofing and sealing are both crucial steps to take to prevent water damage and the chimney leaking inside the house. While waterproofing is more comprehensive, both help safeguard your chimney, extending its life span and preventing expensive repairs. 

Certified fire door inspectors should inspect fire doors. These professionals receive training to specifically assess the condition, functionality, and compliance of fire doors. They often hold credentials from groups like the Door and Hardware Institute (DHI) or the International Fire Door Inspector Association (IFDIA). While fire marshals won’t usually do hands-on inspections, they’ll check that doors are being maintained properly during routine safety audits. If a building relies on fire doors for code compliance, it needs someone who understands the details—the difference between a cosmetic issue and a safety failure—and standards to sign off with confidence.